Introduction

Summer can be a busy season for fitness and wellness facilities.

New members join before vacations, outdoor boot camps become more popular, many race training groups get going and existing clients often increase their activity levels. It is also the season when coaches hear the same questions again and again.

“Why does this workout suddenly feel harder?”

“Why is my heart rate so much higher than it was last month?”

“Should I change my cardio because it’s hotter outside?”

These questions create an opportunity to do more than motivate clients. They create an opportunity to educate them using objective physiological data instead of traditional assumptions.

The challenge is that most coaches rely on external metrics such as pace, power, distance, or heart rate. While these measurements are valuable, they do not explain why a client’s body is responding differently during the summer.

This is why metabolic testing in summer becomes a valuable coaching tool.

Summer heat changes the physiological cost of exercise, even when the workout itself stays the same. Portable metabolic testing helps fitness and wellness professionals understand those changes so they can personalize training, educate clients, and make better coaching decisions.

Why Summer Changes More than Clients May Know

Many coaches assume that if a client completes the same workout, the training stimulus is the same.

Physiologically, that isn’t always true.

A client who comfortably completes a 45-minute run in May may find the exact same workout significantly more demanding in July, even though their pace, distance, and route haven’t changed.

That doesn’t necessarily mean they’ve lost fitness.

More often, it means their body is working harder to regulate temperature while simultaneously supporting exercise.

Understanding this distinction is one of the most valuable lessons coaches can teach clients during the summer months.

Instead of judging every workout by pace or heart rate alone, they can begin evaluating how environmental conditions influence physiological stress.

This is one of the reasons portable metabolic testing has become increasingly valuable for fitness and wellness facilities.

Rather than estimating how the body is responding, coaches can measure it and track over time.

What Happens Physiologically During Exercise in the Heat

To understand why metabolic testing is valuable during the summer, it helps to first understand what the body is trying to accomplish during exercise.

Every movement requires energy. Muscles convert stored carbohydrates and fats into usable energy through aerobic metabolism, a process that depends on oxygen. However, muscles are not perfectly efficient.

Only a portion of the energy produced becomes movement. The majority is released as heat.

Under moderate environmental conditions, the body removes this heat through several cooling mechanisms, sweating, increased blood flow to the skin, evaporation and more. As outdoor temperatures rise, these cooling systems become less effective.

Humidity makes the challenge even greater because sweat cannot evaporate as efficiently, reducing the body’s ability to dissipate heat.

The result is a higher physiological cost for the same external workload.

Imagine two clients cycling at exactly 180 watts. One is training indoors in a climate-controlled facility. The other is riding outside on a hot, humid afternoon. Mechanically, they are performing the same amount of work, physiologically, they are not.

The second client is likely experiencing greater cardiovascular strain, increased oxygen demand, higher sweat rates, and greater perceived effort, despite producing the same power output.

Coach’s Takeaway

The workout hasn’t changed. The client’s physiological response has.

Understanding that difference is the first step toward delivering more personalized coaching.

Cardiovascular Drift: Why Heart Rate Climbs During Summer Workouts

One of the first physiological changes many clients notice is a higher heart rate.

This phenomenon, known as cardiovascular drift, occurs because the cardiovascular system must perform two jobs at the same time.

It must deliver oxygen-rich blood to the working muscles while also transporting heat toward the skin for cooling.

As body temperature rises and fluid is lost through sweating, stroke volume gradually decreases. To maintain cardiac output, heart rate increases, even if exercise intensity remains unchanged.

For coaches who rely heavily on heart rate zones, this creates an important challenge.

A client who normally trains comfortably in Zone 2 may suddenly appear to be exercising in Zone 3 during a hot summer workout, even though they haven’t increased their pace or power.

Without understanding cardiovascular drift, it is easy to misinterpret the data.

Some clients may believe they have become less fit. Others may push even harder, assuming they simply need to “work through it.”

Neither conclusion is necessarily correct. Heart rate reflects more than exercise intensity.

It is also influenced by temperature, hydration, fatigue, stress, and environmental conditions.

Coach’s Takeaway

Heart rate tells you what is happening. Understanding oxygen consumption and metabolic response helps explain why it is happening.

Oxygen Demand Increases, Even at the Same Workout Intensity

Summer heat doesn’t just make exercise feel more difficult. It changes how much oxygen your body needs to perform the same amount of work.

During aerobic exercise, oxygen is used to convert carbohydrates and fats into energy that muscles can use for movement. As body temperature rises, however, additional physiological systems become involved to regulate core temperature, increase blood flow to the skin, produce sweat and other adaptations, all of which require energy.

As a result, the oxygen cost of maintaining the same pace, speed, or power output often increases in hot conditions.

For example, a client who comfortably walks at 6 km/h on a treadmill in an air-conditioned facility may require more oxygen to maintain that same pace during an outdoor summer session. The workout hasn’t changed, but the body’s physiological demands have.

This distinction is important because many clients judge their fitness based on external performance alone.

A slower pace or higher heart rate may not indicate declining fitness. It may simply reflect the additional metabolic cost of exercising in the heat.

Coach’s Takeaway

External workload tells you what your client is doing. Metabolic testing reveals how hard their body is working to do it.

Why Heart Rate and Wearables Don’t Tell the Whole Story

Wearable technology has transformed the fitness industry. Most clients now arrive with a smartwatch, fitness tracker, or heart rate monitor that estimates calories burned, training load, recovery, and even VO2 Max.

These tools can be helpful, especially for motivation.

However, most wearable devices rely on predictive algorithms built from heart rate, movement, and population-based equations. They estimate metabolic physiological responses rather than directly measuring oxygen consumption, this is key given the significant physiological differences between people.

During the summer, those estimates become more difficult to interpret because environmental conditions influence many of the variables they rely on.

For example, a higher heart rate may result from:

• Increased environmental temperature.
• Dehydration.
• Psychological stress.
• Caffeine intake.
• Accumulated fatigue.
• Greater exercise intensity.

Without additional context, it is difficult to determine which factors are driving the response.

Portable metabolic testing complements wearable technology by adding objective physiological measurements.

Instead of estimating how hard the body is working, coaches can measure oxygen consumption and better understand the relationship between workload, energy expenditure, and aerobic capacity and provide direct, specific metrics for each person allowing for precise training zones, identification of limiters and other key insights. 

Go beyond wearable estimates. Discover why directly measured VO2 Max delivers clearer insights and more precise training.

Explore Actual VO2 Max vs. Wearable Estimates

What Metabolic Testing Reveals

So what does portable metabolic testing actually tell you?

For fitness and wellness professionals, it provides objective information that supports more personalized coaching decisions.

Aerobic Capacity

VO2 represents the amount of oxygen the body uses during exercise.

VO2 Max measures the highest rate at which oxygen can be used during maximal exercise and is one of the best-known indicators of aerobic fitness.

While many people focus on improving their VO2 Max score, coaches often gain even more value by understanding how clients use oxygen throughout submaximal exercise, the information before the maximum point in the test.

This information helps establish a baseline, monitor improvements over time, and allow coaches to make better decisions and clients see optimal results.

Personalized Training Zones

Many exercise programs still rely on age-predicted heart rate equations or generalized training zones.

These approaches are useful starting points, but they cannot account for individual physiological differences.

Metabolic testing helps identify personalized training zones based on measured responses rather than population averages.

During the summer, this becomes particularly valuable.

A client whose heart rate is elevated because of heat may not need to train harder or slower. They may simply need training recommendations based on how their body is responding under those conditions.

Personalized training zones help remove much of the guesswork from exercise prescription.

Coach’s Takeaway

The goal isn’t simply collecting more data. It’s collecting meaningful data that helps you coach each client as an individual.

See how metabolic testing turns objective data into more personalized coaching.

Learn How It Works

Comparison: Coaching with Estimates vs. Coaching with Metabolic Testing

Want to see how portable metabolic testing can enhance your coaching?

Book a personalized VO2 Master demo to learn how fitness and wellness facilities are using objective physiological data to personalize exercise programs, educate clients, and deliver premium assessment services.

Turning Summer Physiology into Expanded Coaching Experiences

Understanding how heat affects exercise physiology is valuable. Applying that knowledge to improve coaching is where the real opportunity lies.

Summer often brings an  increase in outdoor training programs, race training and clients looking to become more active. It is also a time when coaches must manage greater variability in how clients respond to exercise.

Onboard New Clients with Confidence

Many new clients begin exercising in the summer after months of reduced activity. They may compare themselves to friends, follow generic workout plans online, or rely on wearable devices to guide their training.

An initial metabolic assessment provides a much stronger starting point.

Rather than prescribing exercise based solely on age or estimated heart rate zones, coaches can better understand each client:

• Ventilatory thresholds
• Energy expenditure during exercise
• Individualized training zones
• Exercise efficiency

This creates a personalized baseline that can be revisited throughout the year to demonstrate measurable progress.

For clients, objective data builds confidence. For coaches, it provides a more informed foundation for exercise prescription.

Improve Summer Weight Management Programs

Many facilities promote weight management or metabolic health programs during the summer.

While calorie tracking and wearable estimates can be useful, they often fail to account for individual differences in metabolism and exercise response.

Resting Metabolic Rate (RMR) testing provides clients’ caloric balance, how many calories they burn per day and what their goal caloric ingestion is based on their goals.

Add Value to Wellness Programs

Wellness is becoming increasingly personalized. Clients are looking for more than workout programs. They want to understand how their body responds to exercise and how to train more effectively.

These assessments can help facilities differentiate their services while providing clients with objective insights that can be repeated and tracked over time for a long-term profile of their metabolic health.

Coach Outdoor Programs More Effectively

Outdoor boot camps, walking groups, run clubs, and community fitness events are especially popular during the summer.

Portable metabolic testing allows coaches to better understand how clients respond in the same environment where they train.

Support Long-Term Client Progress and Retention

One assessment provides useful information. Repeated assessments provide a story.

By periodically measuring aerobic capacity, exercise response, and energy expenditure, coaches can demonstrate how clients’ key metrics are changing over time.

This is particularly valuable because summer performance does not always reflect long-term fitness improvements.

A client may run more slowly in July than they did in April while still improving their aerobic capacity.

Objective metabolic data helps explain those changes, reinforcing that progress should be measured by physiology, not pace alone.

Want to learn how to turn metabolic testing into stronger revenue, better coaching, and lasting client retention? Read the Business Case for Metabolic Testing

Why Portable Metabolic Testing is Expanding Globally

For many years, metabolic testing was associated with large laboratory systems in hospitals and highly controlled testing environments.

Today’s portable Bluetooth enabled technology with instant reporting has changed that.

With VO2 Master, metabolic testing has become part of everyday coaching in 52 countries worldwide.

Fitness and wellness professionals can perform assessments:

• Inside fitness facilities
• During outdoor training sessions
• As part of client onboarding
• During wellness consultations
• Throughout seasonal training programs

The value is not simply collecting more physiological data. It is helping clients understand how their body responds to their exercise or sport specific movement and using that information to make smarter coaching decisions.

When clients see objective measurements instead of estimates, they gain greater confidence in their training program and a clearer understanding of their progress.

Use the VO2 Master Return On Investment (ROI) calculator to see the potential for yearly profit when providing VO2 Master assessments.

Conclusion

Summer creates opportunities for fitness and wellness professionals to provide more personalized, evidence-based coaching with metabolic testing.

As temperatures rise, exercise becomes more physiologically demanding. Heart rate increases, oxygen requirements change, and energy expenditure can vary even when the workout appears identical.

Understanding these responses helps coaches explain why clients may feel different during summer training and adjust exercise programs with greater confidence.

Portable metabolic testing with the VO2 Master analyzer takes that understanding much further.

Rather than relying solely on heart rate, pace, or wearable estimates, fitness and wellness professionals can measure how each client responds to exercise, personalize training recommendations, and track meaningful progress over time.

The result is better coaching, more informed conversations, and a stronger client experience built on objective physiological data.

Ready to Elevate Your Coaching this Summer with Metabolic Testing?

Shop VO2 Master to explore our portable metabolic analyzers, or Book a Demo to see how metabolic testing can become a valuable part of your fitness or wellness facility.

Feature Image: World and Olympic Ironman triathlete Kristian Blummenfelt.

Frequently Asked Questions

Authoritative Sources

1. American College of Sports Medicine. ACSM’s Guidelines for Exercise Testing and Prescription.
2. Périard JD, Eijsvogels TMH, Daanen HAM. Exercise under heat stress: Thermoregulation, hydration, performance implications, and mitigation strategies. Physiological Reviews.
3. Cheuvront SN, Kenefick RW. Dehydration: Physiology, Assessment, and Performance Effects. Comprehensive Physiology.
4. Sawka MN, et al. Exercise and Fluid Replacement. American College of Sports Medicine Position Stand.

Adding a new service is always a business decision.

Will clients value it? Will it fit into your workflow? Will it generate enough revenue to justify the investment?

For many facilities, metabolic testing answers all three questions.

Why Metabolic Testing is Growing so Quickly

Today’s clients expect more than generic training plans.

Whether they’re training for a marathon, trying to lose weight, improving longevity, or simply wanting measurable progress, people increasingly want objective, trackable data.

Metabolic testing delivers exactly that.

With VO2 Master, facilities can offer:

• VO2 max and submax testing
• Resting Metabolic Rate (RMR) testing
• Ventilatory thresholds
• Personalized training zones
• Progress tracking over time

Rather than relying on prediction equations, coaches can make recommendations using real physiological measurements.

For businesses, that creates opportunities to introduce premium assessments, ongoing retesting, and higher-value coaching packages.

The Business Challenges Most Facilities Face

Many businesses recognize the value of metabolic testing but assume it requires:

• A dedicated space
• Expensive capital costs
• Complex software
• Long testing times
• Specialized staff credentials

These barriers have traditionally limited metabolic testing to hospitals and universities.

Portable metabolic analysis changes that.

Instead of dedicating an entire room to testing equipment, facilities can integrate testing into their existing assessment space.

Why Portability Changes Everything

The VO2 Master analyzer was designed to make metabolic testing accurate and convenient outside of the laboratory.

The analyzer is lightweight, wireless, and controlled through a user-friendly mobile application.

This portability allows facilities to:

• Test clients in small assessment rooms
• Perform field-based testing
• Reduce setup time
• Improve workflow between appointments
• Expand services without expanding their footprint

For many businesses, space becomes a competitive advantage instead of a limitation.

Case Study: How BodyStats Built a Major New Revenue Stream

BodyStats already operated a successful DEXA scanning clinic.

They wanted to expand their services by offering VO2 Max and Resting Metabolic Rate testing.

There was one problem.

Their available testing room measured only about 150 square feet.

Traditional metabolic carts simply would not fit.

The Solution

Instead of purchasing a large traditional metabolic system, BodyStats paired the VO2 Master analyzer with an air bike (now a treadmill).

The complete testing setup comfortably fit inside their available space while maintaining a smooth client workflow.

Our mission at BodyStats is to make advanced health tracking available to everyone. The VO2 Master let us bring lab-grade metabolic testing into 150 square feet, a space where a metabolic cart could never fit.”

Eric Lam, Owner

They also cited two major reasons for choosing VO2 Master:

• Compact size
• Simple iPhone app and professional reporting

Those features allowed staff to move efficiently between clients while delivering polished reports immediately after testing.

The Results

Since launching metabolic testing in July 2024, BodyStats has achieved impressive growth.

Perhaps the most impressive statistic isn’t the volume of tests.

Nearly half of all clients returned for additional testing and many just had their tests in recent weeks and months, so aren’t due for re-testing yet.

These numbers demonstrate the value clients place on objective progress tracking.

When clients can measure improvements, they’re more likely to stay motivated and committed.

Better Data Creates Better Coaching

Metabolic testing isn’t only valuable for business owners.

It also helps coaches deliver more individualized recommendations.

One example came from the BodyStats founder’s own household.

His girlfriend wanted to train for her first half marathon.

A VO2 Max assessment showed her first ventilatory threshold occurred at 135 bpm, significantly lower than age-predicted formulas suggested.

Although training at that heart rate initially felt slow, the physiological data guided the training plan.

The result?

She completed her first half marathon while maintaining healthy body weight throughout training using regular RMR assessments and DEXA scans to monitor progress.

Instead of guessing, coaching decisions were informed by objective measurements.

Why Repeat Testing Matters

Many assessments happen once.

Metabolic testing encourages clients to return.

People naturally want to know:

• Is my fitness improving?
• Has my metabolism changed?
• Are my training zones different?
• Is my current program working, what do I need to do now?

These follow-up assessments strengthen client relationships while creating recurring revenue opportunities.

Ready to See the Numbers?

See your revenue potential using the VO2 Master ROI calculator here

Is Metabolic Testing Right for Your Facility?

Portable metabolic testing works well for:

• Longevity and fitness facilities
• Personal training studios
• Performance centers
• Sports medicine centers
• Exercise physiology practices
• DEXA imaging facilities
• Corporate wellness programs
• Universities

The ability to perform testing without a dedicated laboratory opens opportunities for small and large businesses.

See how easy metabolic testing can be

Why VO2 Master?

Facilities consistently choose the VO2 Master analyzer because it combines portability with practical, proven accuracy and workflows. It is trusted in 52 countries worldwide.

Key advantages include:

• Small footprint
• Wireless operation
• Mobile app reporting
• Quick setup
• Indoor and outdoor testing
• Repeatable assessments
• Easy integration into existing services

If you are looking to add revenue to your health and wellness business, the VO2 Master analyzer can open new opportunities not only at your facility but at events and other locations such as corporate wellness and more.

See how facilities use VO2 Master

Conclusion

BodyStats demonstrates that adding metabolic testing can be more than just a new assessment.

It can become a meaningful driver of business growth and client satisfaction.

With more than 3,100 tests performed, 2,000+ clients served, and a 48% repeat testing rate, the results show what’s possible when objective physiology becomes part of the client experience.

If you’re looking to differentiate your facility, create premium services, and deliver data-driven coaching, portable metabolic testing may be the next step.

Ready to see what’s possible?
Book a live demo or Shop VO2 Master online to bring metabolic testing to your facility.

Frequently Asked Questions

External Sources

American College of Sports Medicine (ACSM). ACSM’s Guidelines for Exercise Testing and Prescription.

Here’s how they compare.

1. Portability: Wearable Lab vs Truly Wireless

Both VO2 Master and the COSMED K5 are technically portable systems, but the user experience is physically very different.

The COSMED K5 is a backpack-based system, with wires and external components connecting the mask to the analyzer for mixing a chamber and breath-by-breath modes. While it enables mobile testing, it still carries the complexity of a lab system in a wearable format and impacts natural biomechanical motion in many circumstances.

The VO2 Master analyzer has no external wires or connections. It is self-contained, allowing for unrestricted movement and a simple testing experience.

Key difference:

• K5 = portable lab system worn on the body
• VO2 Master analyzer = wireless completely portable design

2. Cost Comparison:
$35K+ vs. Under $10K

The COSMED K5 typically costs between $35,000 and $50,000 USD, depending on configuration. ¹

At a total cost of $7,000 to $7,600 USD depending on the kit and number of masks, the VO2 Master analyzer is proven to have the accuracy of a lab cart but is more accessible financially, both in upfront investment and long-term ownership costs.

For research funding, growing businesses, new sports performance centers, or military contracts, this is often the deciding factor.

3. Accuracy and Validation

The COSMED K5 is effective in controlled environments, this is a focus for the company which works mainly with hospitals and clinics.

VO2 Master has proven accuracy versus lab carts in numerous published studies and excellent test-retest repeatability. It also shows powerful ecological validity in various test environments indoors and outside, as it does not impact the subject’s natural movement or total weight and resulting test metrics to the degree of the K5 analyzer. The VO2 Master can also be used with tactical testing uniforms such as firefighter, military carrying backpacks and police.

As with all metabolic systems, accuracy depends on:

• Sensor condition
• Calibration procedure
• Testing protocol
• Environmental conditions
• Practitioner training

Over 200 University research labs globally use the VO2 Master due to its accuracy and portability. VO2 Master has undergone independent validation against traditional metabolic carts in academic lab research environments and in humans. These studies demonstrated strong agreement in VO2 max and ventilatory metrics across repeated tests.

“We saw a very well-defined high R-squared for VO2 and also for ventilation efficiency, same for the tidal volumes and frequency,” Dr Molinger explains. “What’s interesting is that the error margin overall was below 2%, and that’s very, very good for a metabolic simulator—even if it’s a full cart. I think that proves that the technology we use in this wireless metabolic framework works very well and gives you very valid numbers.”

Dr. Jeroen Molinger, Duke University Cardiovascular Performance and Innovation Lab

Accuracy, Calibration & Data Integrity

VO2 Master

• O2 Accuracy (0–100%): ± 1%
• Flow Accuracy with syringe calibration: ± 2%
• Flow Accuracy without syringe calibration: ± 4%
• Calibration takes 2–5 minutes, customer-performed

Key validation studies:

• Thiessen et al. (2025) — Scandinavian Journal of Medicine & Science in Sports: “(Re)assessment of the COSMED Quark CPET and VO2Master Pro Systems.” Conclusion: “both systems appear valid, reliable, and transferable.” VO2 Master showed 0.6% mean error and 1.2% test-retest reliability — better than the COSMED Quark.
• Davis et al. (Sam Houston State University) — Demonstrated equivalence between VO2 Master Pro and Cosmed Quark for VO2 (35.1 vs. 35.4 mL·kg⁻¹·min⁻¹) and VE (72.4 vs. 73.8 L·min⁻¹).
• Duke University — Dr. Jeroen Molinger: “The error margin overall was below 2%, and that’s very, very good for a metabolic simulator—even if it’s a full cart.”
• 2026 APS Webinar Poll: 42% of respondents trust VO2 Master for CPET needs vs. only 13% said COSMED.

Recent published studies: VO2 Master

COSMED K5: cosmed.com/…/773-accuracy-and-reliability-of-cosmed-k5-portable-metabolic-device-versus-simulating-system

4. Testing Metrics and Capabilities

VO2 Master vs. COSMED K5

5. Practical Application: Lab vs Field

VO2 Master focuses on delivering accuracy and the most actionable and widely used metrics in fitness, longevity, research and sports including: VO2 Max and submax, ventilatory thresholds, energy expenditure and resting metabolic rate (RMR).

The K5 provides full breath-by-breath and mixing chamber data, including VO2, VCO2, and respiratory exchange ratio (RER) making it ideal for medical related testing in environments where budgets are not a primary factor for acquisition.

In a 2026 American Physiological Association (APS) webinar poll, 42% of respondents (56) said they trust VO2 Master for their CPET needs. Respondents spanned research, fitness, performance optimization, and training assessment use-cases.

Which System is Right for You?

The Bigger Shift in Metabolic Testing

The COSMED K5 represents the evolution of lab-grade testing becoming portable by including the testing technology in the backpack.

VO2 Master represents the next evolution of technology to now allow accurate testing without significantly impacting the test subject’s movement and total weight thus giving improved data relevance, client comfort and more efficient set up and workflow.

For many modern applications, especially in research, longevity, fitness, and applied performance, the ability to accurately test more people, more often, with less friction and cost is what ultimately drives program success.

Frequently Asked Questions

COSMED information from website cosmed.com as of May 27th, 2026

Introduction

Athletic trainers are under pressure to do more than manage injuries. They are often expected to optimize training and performance, support recovery, and provide objective data to justify decisions. The VO2 Master Analyzer is helping bridge that gap.

Athletic trainers are using the VO2 Master Analyzer to bring lab-grade metabolic insights into real-world athletic settings. This enables better return-to-play decisions, smarter conditioning, and more personalized training.

The Evolving Role of Athletic Trainers

Athletic trainers today operate at the intersection of rehab and performance.

From injury care to performance support

Historically, athletic trainers focused on:

• Acute injury management
• Rehabilitation protocols
• Return-to-play clearance

Now, expectations include:

• Conditioning progression
• Load monitoring
• Aerobic capacity assessment
• Data-driven decision making

This shift requires better tools. Subjective assessments and basic metrics like heart rate are no longer enough in highly competitive situations.

What the VO2 Master Analyzer Measures

The VO2 Master Analyzer is a portable system that measures oxygen consumption in real time.

Key metrics explained

VO2 and VO2 Max

VO2 represents oxygen uptake. VO2 Max reflects maximal aerobic capacity and is widely used as a performance benchmark. VO2 submax during training is used for endurance training to identify ideal race pace, breathing mechanics limiters and more.

Ventilatory thresholds

These thresholds indicate changes in breathing patterns tied to metabolic shifts. They are critical for defining accurate training zones.

Energy expenditure

Using indirect calorimetry, the system estimates calorie burn and substrate use.

Indirect calorimetry calculates energy expenditure based on oxygen consumption. This method is widely accepted in both performance and professional health and fitness settings (ACSM Guidelines for Exercise Testing and Prescription).

Why Portable Metabolic Testing Matters

Traditional metabolic testing is confined to labs and used to be only for patients.

Limitations of lab testing

• Expensive and time-consuming
• Limited ecological validity due to controlled environment and movement
• Carts could not be moved

Advantages of portability

Portable metabolic testing allows:

• Sport-specific testing allows more natural movement
• Real-time feedback, instant reports
• Frequent retesting provides key metrics and trends
• On-field assessments can be performed indoors or outside and when traveling

This aligns with how athletic trainers actually work, in dynamic field environments.

NCAA new guidelines for performance technology use, see more information

Key Use Cases for Athletic Trainers

Return-to-play conditioning

Athletes often regain strength before they regain aerobic fitness.

With VO2 Master, trainers can:

• Track aerobic recovery post-injury
• Compare pre- and post-injury data
• Progress conditioning safely

This adds objectivity and accuracy to return-to-play decisions.

Aerobic capacity profiling

Not all athletes respond the same to training.

VO2 Master enables:

• Individualized VO2 Max and submax testing
• Identification of aerobic limitations
• Targeted conditioning programs

Research supports VO2 Max as a key determinant of endurance performance (Bassett and Howley, 2000).

Training zone identification

Heart rate zones are often inaccurate on their own because they are based on population averages and are not specific to your athlete demographics.

With ventilatory thresholds:

• Zones are personalized
• Training becomes more precise
• Overtraining risk is reduced

Monitoring deconditioning

During injury downtime, aerobic fitness declines quickly.

Athletic trainers can:

• Quantify fitness loss
• Adjust rehab intensity
• Rebuild conditioning progressively

Field-based sport testing

This is where VO2 Master stands out.

Trainers can test:

• Team sport players during drills on the field or court
• Runners, cyclists or swimmers

This improves relevance and athlete buy-in.

VO2 Master vs Traditional Lab Testing

Traditional systems like those used in CPET testing remain valuable. However, portability is changing how often and where testing happens.

The American College of Sports Medicine highlights the importance of valid, repeatable testing conditions. Portable systems enable this through consistent protocols in real-world environments.

Get an instant quote and see how portable metabolic testing fits into your workflow.

Real-World Benefits in Performance and Rehab

Better decision making

Objective data supports:

• Return-to-play clearance
• Training progression
• Conditioning benchmarks

Improved athlete compliance

Athletes are more engaged when:

• Testing is motivating through live feedback 
• Insights and reporting is immediate
• They understand why they experienced limiters and plateaus

More frequent testing

Because setup is simple:

• Trainers can test more often
• Track progress over time
• Adjust programs dynamically

Bridging Rehab and Performance

One of the biggest challenges in athletic training is the transition from rehab to top performance.

The missing link

Athletes often:

• Pass strength tests
• Show good mobility
• Still lack conditioning

This gap increases reinjury risk.

How VO2 Master helps

By tracking:

• Aerobic capacity
• Ventilatory thresholds
• Energy efficiency

Trainers can ensure athletes are truly ready for game demands or identify limiters that can be addressed.

Supporting Preventive Health and Longevity

Beyond sport, metabolic testing supports long-term health.

Key applications

• Monitoring aerobic fitness trends
• Assessing metabolic efficiency
• Supporting general wellness programs

VO2 Max has been associated with overall health outcomes and longevity in population studies (Blair et al., JAMA).

Athletic trainers working with general populations can use this data to guide lifestyle interventions.

Conclusion

Athletic trainers’ responsibilities have evolved. Their tools need to evolve too.

The VO2 Master Analyzer brings metabolic testing directly into the environments where athletes actually train and compete. This advancement enables more precise decisions, more personalized athlete programs, and improved outcomes across both performance and rehab.

Book a demo or get an instant quote to see how the VO2 Master Analyzer can help your athletes return stronger, train smarter, and stay ready for championship-level performance.

Feature photo courtesy of Continuum HP, NFL Combine

Frequently Asked Questions

Metabolic testing is not a one-time service. It becomes more profitable to your business when it anchors programs, drives retesting, and increases client lifetime value.

This article breaks down the business case for metabolic testing, including pricing, margins, and retention mechanics so you can evaluate how it fits your growth model.

What Metabolic Testing Actually Measures

Metabolic testing quantifies how the body uses oxygen and energy which delivers key insights for effective health and training decision making.

• VO2 Max and submax: Measures aerobic capacity and cardiovascular efficiency
• RMR (Resting Metabolic Rate): Shows daily calorie needs at rest
• Training zones: Defines personalized intensity thresholds for exercise

This data turns training programs into measurable, personalized plans which can be tracked for progress over time.

Get VO2 Master sample reports and see how metabolic testing insights can support consultations, programming, and retesting.

Why Health Facilities and Longevity Centers are Adding Metabolic Testing

Demand for objective health data is increasing, so are time efficient training programs that optimize client results.

Facilities are responding to three shifts:

• Personalization expectations: Clients expect science-backed personal programs
• Longevity focus: Baseline and trend tracking is becoming standard
• VO2 awareness: Increased public awareness of the value of VO2 metrics for fitness and health, both Max and submax testing

Metabolic testing with the VO2 Master analyzer provides all three directly and accurately. It provides VO2, heart rate, respiratory frequency, ventilatory thresholds , power and more in real time, data that was not available outside a lab in the past.

For fitness and wellness professionals,  this creates a monetizable service layer. Once you invest in exercise equipment and facility space, profitability depends on how effectively those assets generate revenue. Metabolic testing adds a measurable, high-value service layer that can be sold, packaged, and repeated over time. Metabolic testing is different, it is sustainable revenue generation.

We did just over 400 different assessments using the VO2 Master, representing about $40,000 in revenue… it’s been instrumental in the success of our location.

Chris Brubaker, Owner, DexaFit Scottsdale

Here’s how DexaFit Scottsdale generated 40K in revenue using the VO2 Master Analyzer

The Five Revenue Levers of Metabolic Testing

The business case for metabolic testing is built on five connected levers:

1. Paid Assessments: The test itself generates direct revenue.
2. Program Conversion: The test results justify personalized programs. The personalized data becomes the motivating factor as clients can see their own results and want to beat them.
3. Retesting Cadence: Follow-up tests create recurring revenue and reinforce engagement and long-term coach-client business relationship.
4. Retention and Lifetime Value: Clients stay when progress is understandable and measurable.
5. New Client Acquisition: Word of mouth referrals create new client awareness, acquisition and conversion.

Core insight:

The test alone is not the product. The client’s results and successes from the precise insights drives profitability. People of all ages and fitness goals want to use what the world’s best athletes find efficient and valuable in their training programs.

See how this model applies to your facility, get the VO2 Master Buyers Checklist here.

How to Price Metabolic Testing: Models That Work

There are five common pricing models

A-la-Carte Testing

Simple, standalone testing and instant report fee. Easy to implement.

Assessment + Coaching Package Model

Includes testing, report and recommendations. Higher perceived value.

Membership Model

Includes testing as part of an ongoing subscription.

Corporate / Group Testing

Used for team assessments or workplace corporate wellness programs.

Pricing Benchmarks

Typical ranges across facilities:

These are examples only. Actual pricing depends on your positioning and market.

Understanding Profit Margins on Metabolic Testing

Profitability depends on the complete picture of overhead and unit economics, not just pricing.

Gross Margin Formula

Gross profit per test =
Test price − staff time − consumables − equipment allocation

Example (Illustrative)

• Test price: $199
• Staff time: $40
• Consumables: $2
• Equipment allocation: $20

Estimated gross profit: $137 per test

Actual margins vary based on staffing and volume of tests per month or year.

Simple Break-Even Example (Illustrative Only)

VO2 Master Professional Kit: $7,595 + $550/year service

Break-even depends on financing, staffing, and volume of testing. Many VO2 Master customers break even in 3-6 months, it’s all up to you.

Key takeaway:

Most facilities break even in a matter of months depending on how often they plan to test. Demand comes through word of mouth, marketing and joining the VO2 Master facility finder global testing locator.

Return on investment (ROI) Calculator

See your revenue potential using the VO2 Master ROI calculator here

How Metabolic Testing Improves Client Retention and Lifetime Value

Retention is where the model scales for your business

The Retesting System

• Initial test establishes baseline
• Training methodology delivers the intervention
• Retesting validates progress

Cadence: Depends on Client Goals

• VO2 Max: For longevity clients testing can be every 6 to 12 months unless they have a specific goal for a shorter period. For athletes, depending on the sport and time of season, testing can be pre and post training blocks or for endurance athletes, submax testing may be performed regularly during race pace training or equipment and biomechanics evaluation.

• RMR: Depends on client goals, weight loss, sport training or longevity. Can be quarterly or more or less frequently.  

Why It Works

• Objective progress builds trust
• Data insights motivates continued engagement
• Clients stay longer when improvement is clear and measurable

The first test sells the plan. The retest sells the continuation.

Turn metabolic testing into a revenue-generating service. Request your VO2 Master quote today.

Facility Examples: How Different Businesses Apply It

Fitness Center/Gym

VO2 testing supports training programs.

Example:

$179 test, retested 3 times per year = $540/year/per person

Each athlete or fitness enthusiast generates multiple testing sessions annually depending on goals.

5 client tests/week = $895/week x 4 = $3,580/month (Example only.)

Health and Wellness Facility

VO2 + RMR used for baseline assessments.

Example:

4 tests/week at $199 = ~$3,200/month.

If 50% convert into a $399/month program, recurring revenue increases significantly. (Example only.)

Longevity Center

Testing included in a membership tier.

Example:

$200 monthly membership includes quarterly testing and review. Retention improves due to ongoing tracking. (Example only.)

See how longevity businesses use VO2 Master to turn testing into a scalable service.

Mistakes to Avoid

Selling Only the Test

Limits revenue and reduces perceived value.

Skipping the Consultation

Providing the report without discussion and future planning does not have the same impact.

No Retesting Plan

Removes recurring revenue.

Not Getting the Word Out

This service differentiates your offerings in a crowded and competitive market. Let your community know.

Conclusion

The business case for metabolic testing is not built on a single aspect or transaction. 

It is built on a system:

• Testing creates the baseline
• Training programs based on the metrics drives client program success
• Retesting sustains motivation and engagement
• Data improves retention
• Word of mouth referrals and marketing increases new client awareness, acquisition and conversion

For facilities that implement all four layers, metabolic testing becomes a scalable revenue and retention tool.

Ready to evaluate metabolic testing for your facility?
Book a demo with VO2 Master or request a quote.

Frequently Asked Questions

Author: Nancy Phillips, Kinesiologist, MBA

Introduction

Many nutrition plans start with a decision based on estimations.
That guess often determines whether a client sees progress or stalls.

A resting metabolic rate test provides a direct measurement of how many calories the body uses at rest, giving professionals reliable, specific insights for helping their clients achieve their goals.

If you are not measuring metabolism, you are relying on assumptions. Measuring it changes how programs are built and how clients respond.

What Is a Resting Metabolic Rate Test

A resting metabolic rate test measures how many calories the body uses at rest to support basic physiological functions.

This includes breathing, circulation, and cellular activity.

RMR represents the largest portion of daily energy expenditure for most individuals.

The test is performed using indirect calorimetry, a method that estimates energy expenditure by measuring oxygen consumption.

This provides a personalized baseline instead of relying on population averages.

Why Estimating Metabolism Falls Short

Most calorie recommendations are based on equations.

These equations use variables like age, weight, height, and sex. While useful, they assume people with similar characteristics have similar metabolism.

That assumption is often incorrect.

Common Limitations:

• Estimated calorie needs can vary significantly from actual needs
• No visibility into metabolic adaptation
• Limited ability to explain stalled progress
• Programs built on population averages instead of individuals

This gap leads to frustration for both clients and coaches.

How RMR Testing Works

RMR testing measures oxygen consumption while the individual is at rest.

From this data, energy expenditure is calculated using established metabolic equations such as the Weir equation.

What the Test Provides:

• Daily caloric needs at rest
• Goal ingestion calories
• Insight into metabolic efficiency

With the VO2 Master portable metabolic analyzer, testing can be completed in 10-20 minutes in gyms, health clubs, or wellness facilities.

Naturopathic Medical Doctor Mary Pardee discusses why she uses the VO2 Master for RMR and VO2 testing. Dr. Pardee specializes in preventative medicine and longevity in Los Angeles, California.

Discover why Dr. Pardee would choose “VO2 Master again in a heart beat” 

Why RMR Testing Matters for Clients

RMR testing changes how programs are built and how clients engage with them.

Key Benefits:

• More accurate calorie targets
  Programs are based on measured data, not estimates
• Improved adherence
  Clients are more likely to follow plans when they know their numbers
• Objective progress tracking
  Changes in metabolism can be monitored over time
• Better communication
  Data provides a clear reference point for coaching conversations

Clients respond to measurable feedback.

When they can see progress, they stay engaged.

Stop building nutrition plans on estimates.
With VO2 Master RMR testing, you can give clients measured metabolic data, more accurate calorie targets, and a clearer path to results.

Bring metabolic testing into your facility. Request a quote today.

Comparison: Estimated vs Measured Metabolism

How Professionals Apply RMR Testing

RMR testing fits into multiple service models.

1. Client Onboarding

• Establish baseline energy needs
• Set initial caloric ingestion targets

2. Program Adjustments

• Modify calorie intake based on progress
• Identify under- or over-fueling

3. Fat Loss and Weight Management

• Improve long-term sustainability
• Reduce trial and error

4. Premium Services

• Offer RMR testing as a paid assessment
• Increase revenue per client

Use our ROI calculator to learn how much you can earn per month with VO2 Master metabolic testing. 

The Role of RMR in Long-Term Progress

Metabolism is not static. It changes with training, nutrition, and lifestyle.

RMR testing allows professionals to track these changes and adjust programs accordingly.

This is particularly valuable in long-term coaching relationships.

Instead of relying on assumptions, decisions are based on measurable trends.

Supporting Evidence

Indirect calorimetry is widely recognized as a practical method for determining caloric expenditure in applied settings.

• American College of Sports Medicine guidelines highlight the importance of individualized assessment in fitness programming
• Research in nutrition science supports the variability of metabolic rates between individuals
• Health and performance settings continue to use indirect calorimetry for accurate metabolic measurement

Conclusion

A resting metabolic rate test provides a clear foundation for personalized nutrition and training.

It replaces assumptions with data and helps professionals deliver more consistent, measurable results.

As the industry moves toward more individualized approaches, measuring metabolism is becoming a standard part of effective coaching.

Book a demo to learn how to upgrade your client assessments with specific metabolic insights, your clients will benefit, and so will your business.

FAQs

Introduction

The performance landscape in professional hockey changed significantly and that change opens opportunities for independent fitness professionals to help motivated NHL athletes learn their fitness metrics and limiters.

With current Collective Bargaining Agreement (CBA) limitations restricting team-based physiological testing during training camp and regular season, a big opportunity exists for independent performance professionals.

The VO2 Master portable metabolic analyzer allows fitness professionals to deliver high-value, objective performance insights to NHL athletes outside of team environments.

The Changing Landscape of NHL Performance Testing

Professional hockey has always relied on performance data. Traditionally, teams conducted structured testing in controlled environments including strength and conditioning tests and on-ice performance evaluations.

However, changes within the National Hockey League and its collective bargaining framework have shifted how and where testing occurs.

This has created a gap.

A gap between what motivated athletes need and what teams can formally provide during training camps and regular season.

Learn how to attract elite athletes to your facility with VO2 Master testing 

What the CBA Shift Means

Under current agreements between the National Hockey League and the NHL Players’ Association, there are increased limitations around team-controlled testing and monitoring.

• This impacts the timing of physiological assessment and independent training programs.

Fitness, performance, and injury recovery do not stop for committed athletes. They still train and need feedback, even when intensity changes throughout the year.

Why VO2 Testing Matters in Pro Hockey

VO2 refers to the body’s ability to use oxygen during exercise. VO2 Max reflects the upper limit of aerobic capacity.

In hockey, this matters for:

• Repeated high intensity efforts
• Recovery between shifts
• Sustained performance over games and the season
• Identifying limiters to performance

Submax VO2 testing measures efficiency at competitive level intensity rather than max capacity and provides insight into:

• Energy cost of skating 
• Fatigue response
• Training Adaptation

This is actionable data that informs optimal training.

The Opportunity for Independent Professionals

This shift creates a clear opportunity, you can provide services that were traditionally confined to team environments.

This is valuable to the motivated athlete because they want to know the most efficient and effective way to optimize their training outcomes. You can move beyond basic heart rate zones and push into direct physiological metrics providing key insights into their current physiology and opportunities for improvement.

In addition to VO2 Max and submax data, you and the athlete will see live, real-time metrics including:

• Heart Rate
• Tidal volume
• Ventilation
• Respiratory Frequency

Breathing mechanics provides valuable insights into limiters and how to optimize the training for each individual athlete.

This allows you to build highly individualized training zones based on players’ actual ventilatory thresholds-not estimated ones. It also helps them ensure each player is training the correct energy systems. 

With this data, you can design more efficient sessions that are shorter, more effective, and better targeted.

See the revenue you can generate with metabolic testing

Key Advantages: Client and Business Benefits

• Offer VO2 Max, submax and RMR testing
• Provide objective performance data outside team structure including instant reporting
• Provide differentiated services in a competitive market

Athletes are looking for ways to maintain a competitive edge. VO2 testing provides a measurable way to do that while driving your revenue.

Explore the Continuum HP case study

Comparison: Traditional vs Portable VO2 Testing

How to Implement VO2 Master Testing with Hockey Players

1. Establish a Baseline

• Measure VO2 Max
• Identify current capacity

2. Define Training Zones

• Use provided ventilatory thresholds
• Align conditioning with physiology

3. Monitor Submax Efficiency 

• Track oxygen cost at set workloads
• Identify improvements or regressions

4. Re-Test Regularly

• Before and after training blocks, pre-season
• Adjust programming based on data
• During injury recovery/return to play

5. Integrate into Off-Ice Training

• Treadmill or sport-specific conditioning
• Maintain relevance to hockey demands

Learn more about testing with athletes using the VO2 Master Analyzer

Turn performance data into a service offering.
Book a demo to see how VO2 testing can fit into your workflow.

Seamless Device Integration for Complete Athlete Profiling

What expands VO2 Master’s value is not only the fact that it’s wireless and motivates the athlete with live visual data, but it also provides integration with the broader sports science ecosystem.

Teams often sync VO2 Master with:

• Moxy and Train Red 
• Cyclus 2
• Wahoo
• Delsys EMG
• Garmin
• CORE

This allows expanded physiological profiles of each athlete, connecting the dots between effort, efficiency, and recovery. 

Learn more about the compatible devices here

Why Portability Changes Everything

Traditional metabolic systems are lab-bound. It can be time-consuming for athletes to visit a lab, and controlled environments may limit natural movement, which is key for relevant, accurate results.

Portable VO2 testing with the VO2 Master analyzer allows:

• Testing in training facilities
• Integration into conditioning sessions
• Faster setup and more frequent assessments

This increases ecological validity. Ecological validity means the data reflects real training conditions.

Conclusion

The performance environment in professional hockey has changed with CBA limiting VO2 testing of players.

This has created a major opportunity for fitness professionals.

VO2 testing allows independent professionals to step in and provide high-quality, objective performance insight for players during their off-season.

For athletes, this means better understanding of their physiology and fitness.

For practitioners, it means a new way to deliver value.

Position yourself at the forefront of performance testing.
Book a demo or get an instant quote to start offering VO2 testing.

FAQs

Please note: The VO2 Master Analyzer is designed to operate within a temperature range of 17–45°C. Hockey arenas can vary significantly in ambient temperature, particularly at ice level where conditions may fall below this range. For optimal performance and data accuracy, it is recommended to conduct testing in areas  that meet the specified temperature requirements. Operation outside of the recommended temperature range may impact sensor performance and data reliability.

Fitness assessments at gyms in Europe are changing fast.

Gyms are under pressure to deliver more personalized, measurable, and engaging experiences to a growing member base.

VO2 testing provides direct physiological insight that improves client results, increases retention, and differentiates facilities in a competitive market.

The Growth of Fitness Assessments in Europe

The European fitness market is expanding rapidly particularly in countries like Germany, United Kingdom, France, and Spain. Membership reached 75.5 million in 2025, with revenue exceeding 39 billion euros, according to the European Health and Fitness Market Report 2025 by Deloitte and EuropeActive.

Yet penetration remains low at 9.3 percent, this creates a clear business opportunity.

Gyms that provide higher-value assessments are better positioned to:

• Attract new members
• Increase retention
• Improve revenue per client

At the same time, interest in VO2 Max online has tripled in Europe over the past four years.

Demand for more advanced, personalized fitness insight is rising rapidly. People have no shortage of assumption-based data from their watches and rings, but they don’t typically have accurate data based on their own lungs and heart, which is what matters most.

Learn more about measuring actual VO2 Max and wearable estimates here

Why Traditional Gym Assessments Fall Short

Most gyms still rely on basic assessment tools like age and heart rate based estimates.

These methods are accessible, but they rely heavily on assumptions.

Common limitations include:

• Indirect measurements of fitness
• Limited insight into performance limiters and the reasons behind plateaus
• Little to no information about movement economy or physiological efficiency

This creates a gap between what gyms measure and what actually drives results.

What VO2 Testing Measures

VO2 refers to the amount of oxygen the body uses during exercise.

VO2 Max represents the maximum capacity of the body to use oxygen. It reflects how well the cardiovascular, respiratory, and muscular systems work together.

More importantly for gyms, submax VO2 testing measures oxygen use at controlled intensities and is extremely useful for endurance race pace training and more.

Learn more about race pace training here

This provides insight into:

• Efficiency of the cardiovascular system
• Energy Cost
• Fatigue Response
• Training Adaptation
• Recovery and return to play timelines

This is where real differentiation happens.

Why VO2 Testing Matters for Gyms

VO2 testing allows gyms to move from estimation to measurement for their clients.

Key Benefits

• More precise training zones
• Motivation of live data during testing and instant reports
• Objective progress tracking
• Personalized program design backed by science
• Stronger client engagement

Clients are no longer guessing if they are improving, they can see it in their physiology and they LOVE beating their own numbers.

Comparison: Traditional vs VO2-Based Assessments

How Gyms Are Applying VO2 Testing

Gyms across Europe are integrating VO2 testing into their services in practical ways.

1. Onboarding Assessments

• Establish baseline VO2 Max and ventilatory thresholds
• Define individualized training zones

2. Re-Testing Based on Client Goals

• Track adaptation over time
• Adjust training based on data

3. Premium Coaching Services

• Offer VO2 testing as a paid service
• Increase revenue per member 

4. Group Training Optimization

• Align intensity across members
• Improve class outcomes

See how VO2 testing can help your gym drive revenue.
Book a demo or get an Instant Quote

The Shift Toward Real-World Testing

Modern gyms are moving beyond estimates and guesswork.

Portable VO2 testing allows measurements during:

• Treadmill running, cycling sessions, rowing and more
• Functional training
• Submax endurance training
• Indoors or outside

Test retest repeatability is important for long-term tracking, clients are highly motivated when they can see their progress over time right in front of them.

For coaches, these insights make it easier to create more informed, personalized, and effective training decisions for each client.

Business Growth: Revenue and Retention

Metabolic testing unlocks multiple revenue streams for gyms:

• VO2 Max, submax and RMR assessments
• Retesting packages and memberships
• Premium coaching tiers
• Corporate wellness and weight-management programs
• Elite athlete testing
• Annual first responder services testing 

Beyond new client revenue, metabolic testing improves retention. Clients who see their progress in detail are motivated and more likely to stay engaged.

See how much new revenue metabolic testing can unlock for your gym or studio 

Learn How Metabolic testing Drives Revenue and Relevance

Conclusion

Fitness assessments at gyms in Europe are evolving

As the market grows toward 100 million members, gyms are delivering more value through better insight and personalization.

VO2 testing provides a clear advantage to the client and fitness professional improving knowledge and results which leads to greater client satisfaction and revenue growth.

The VO2 Master analyzer is currently being used by numerous thought leading gyms and health facilities in countries across Europe including the U.K., Germany, Norway, France Spain and Switzerland. For more information, click the facility finder

Upgrade your fitness assessments.
Book a demo or request a quote and grow your business with metabolic testing

Featured image: MTM Gym Personal Training, Berlin

Frequently Asked Questions

Introduction

At the highest levels of endurance sport, marginal gains determine outcomes. Increasingly, those gains are not necessarily coming from raising VO2 Max, but from improving efficiency at submaximal intensities.

Submax VO2 testing quantifies the oxygen cost of race-relevant workloads. For elite runners, this is often more actionable than VO2 Max for identifying limiters and optimizing performance.

What is Submax VO2 Testing?

Submax VO2 testing measures oxygen consumption at fixed, repeatable workloads below maximum effort, typically aligned with:

• Ventilatory thresholds
• Race pace
• Environmental and sport specific training

For elite runners, these intensities represent the majority of both training volume and competitive output.

The key variable is not capacity, but oxygen cost per unit of speed.

VO2 Max vs Submax VO2 Training in Runners

Capacity Has a Ceiling, Efficiency Scales

VO2 Max has long been used as a benchmark of aerobic potential. Among elite runners, VO2 Max may be similar yet their race results can vary widely. Running economy and threshold performance can outweigh VO2 Max when it comes to race performance which is why submax (a fixed % of a threshold) metrics are so valuable. 

Submax VO2 training focuses on insights derived from runner testing in real world circumstances thus preparing them more effectively for achieving their potential during competition.

In simple terms:

• Lower oxygen cost at a given pace = better efficiency
• Higher oxygen cost = more energy required

When competing, improvements in running economy and metabolic efficiency can have a greater impact on race outcomes than increases in VO2 Max.

Why Running Coaches are Shifting Focus

Modern endurance coaching is increasingly data-driven, but not all data is equally actionable. VO2 Max is limited for training modifications if it’s the only data point a coach measures.

Submax VO2 training provides:

• Direct measurement of efficiency at race pace
• Insight into metabolic adaptations across a training cycle
• Early detection of maladaptation or fatigue

This aligns with the demands of racing, tactical pacing and long-duration efforts where outcomes depend on:

• Efficiency
• Fuel use
• Breathing patterns
• Movement economy

Submax VO2 training captures these factors directly during sport-specific movement which increases ecological validity and usefulness during decision-making.

Limitations of Wearables for Training Insights

Wearables provide modeled insights based on:

• Pace
• Heart rate
• Population data

These models break down for training decisions and a runner’s physiologic adaptation due to:

• No direct measurement of VO2 and breathing mechanics over time
• Individual variability
• Environmental and tactical factors

Because wearables do not directly measure oxygen consumption, ventilation dynamics or breathing efficiency they cannot clearly identify physiologic limiters of the cardiovascular system or accurately provide zone training insights. 

Two elite level athletes can run the same pace at the same heart rate, but with very different metabolic costs. This gap becomes critical when optimizing marginal gains.

Identifying Performance Limiters with Submax VO2 Testing

Controlled submax testing allows coaches to isolate variables that are otherwise difficult to quantify and gain practical insight into individual runner adaptation.

Key indicators:

• Elevated VO2 at fixed pace → reduced efficiency
• Increasing ventilation without pace change → potential respiratory limitation 
• Drift in oxygen cost across sessions → accumulated fatigue

With portable metabolic testing, you can measure VO2 in real time, ventilation, respiratory frequency, tidal volume and more.

The test-retest capability provides a clearer picture of what is limiting performance such as biomechanical or anaerobic inefficiencies, respiratory limitations and even environmental and equipment factors.

Using a system such as the VO2 Master analyzer, these variables can be captured in real time during sport-specific movement while training rather than annually in a lab. This allows greater understanding of the runner’s individual adaptations and ideal training zones.

Why Submax Testing is More Repeatable

Submax testing has lower physiological cost and can be integrated into training cycles due to the flexibility of using it indoors or outside with Bluetooth enabled connectivity.

This makes it more suitable for longitudinal monitoring across:

• Pre-season
• Competitive season
• Recovery from injury

Optimize Race Execution

Understanding oxygen cost at race pace allows for:

• Better athlete pacing decisions 
• Improved energy management

Case Example from Running Coaching Luis Orta

22 athletes, 22 personal bests, a reflection of data-informed coaching trends.

Olympian and marathon coach Luis Orta recently reported that 100% of his running clients competing in a recent marathon achieved personal bests.

While outcomes depend on multiple variables, this reflects a broader shift in elite coaching toward:

• Individualized data
• Continuous monitoring
• Specificity of training inputs

Submax VO2 race pace testing supports this model by providing repeatable, actionable metrics aligned with race demands.

Read more about Luis Orta’s Case Study

How Metabolic Testing Enables Submax VO2 Training

Portable systems like VO2 Master allow measurement:

• During real runs
• At controlled paces
• In training environments on tracks, roads or paths

This enables:

• Immediate feedback
• Repeatable testing
• Individualized insights

Instead of estimating performance, coaches can measure it directly. Metabolic testing has moved out of the lab and into daily training environments. For high-performance programs, this represents a shift from periodic testing to regular performance insights and adaptations.

Interested in integrating submax VO2 testing into your coaching program?
Book a demo to see how real-time metabolic data can optimize your coaching results.

Applications in NCAA and Pro Sports

Training Prescription Validation

Submax VO2 testing allows programs to verify whether:

• Aerobic development is progressing
• Interventions are producing measurable changes

Monitoring Athlete Readiness

Tracking oxygen cost at standardized workloads provides a consistent metric for:

• Readiness
• Recovery status
• Adaptation trends

Refining Training Zones

Traditional zones based on heart rate or pace can lack precision.

Submax VO2 training enables:

• Physiologically anchored zones
• More consistent intensity distribution
• Enhanced awareness of athlete to physiologic changes during their training and racing

In-Season Adjustments

Because submax testing occurs during training, it is low-disruption and can be integrated:

• During competitive phases
• Between races
• Without excessive fatigue

Read more about VO2 applications in NCAA and pro sports here.

Conclusion

As coaching continues to evolve toward precision and athlete individualization, submax VO2 testing is becoming essential for optimal decision making for athlete training and recovery. While VO2 Max has been a critical measurement for decades, it is limited due to its “one point in time” all out measurement in a lab on a treadmill. With submax portable testing now possible on the track, road or trails, repeatable testing can be conducted to more accurately determine ideal training methodologies for individual runners.

As athletes adapt to training, some improvements show up in efficiency or thresholds well before seeing VO2 Max change. This means improvements in running economy and threshold performance can precede and outweigh changes in VO2 Max when it comes to race performance. This is why submax metrics are so valuable and being implemented globally by thought leading coaches. Book a demo and explore how the VO2 Master can support submax VO2 training in your coaching environments.
Measure efficiency, monitor adaptation, and have deeper insights for your coaching decisions.

Read More about Submax VO2 testing and protocols

Frequently Asked Questions