VO₂ testing equipment plays a central role in how we evaluate your physiology at Stretch Affect, because lasting fitness begins with breath. Your ability to deliver and use oxygen is the foundation of mobility, strength, endurance, recovery, and metabolic health.
This is why we’ve expanded our assessment process to include laboratory-grade VO₂ max and Resting Metabolic Rate (RMR) testing — giving you a clearer, more complete picture of how your body performs beneath the surface.
VO₂ testing equipment allows us to understand how efficiently you produce and utilize energy. With modern portable tools such as the VO2 Master Analyzer, you no longer need a hospital or lab to get accurate metabolic and cardiorespiratory insights. These tools let us measure your physiology in real time, in our space, and in the context of your training environment.
VO₂ max (maximal oxygen uptake) measures the maximum rate at which your body can consume oxygen during maximal exertion. It reflects the combined efficiency of your lungs, heart/circulatory system, and muscle-level oxygen use, giving a clear view of your real cardiorespiratory fitness and endurance capacity.
A higher VO₂ max means your body can deliver oxygen more effectively — supporting sustained effort, better stamina, faster recovery, and capacity for high-intensity training.
VO2 max is one of the strongest predictors of long-term health outcomes and longevity.
To test for VO2 max, you need to put your body under physical stress, typically using a treadmill or a bicycle while being hooked up with wires and tubes.
But at Stretch Affect, we use the portable VO2 Master. Unlike traditional metabolic carts, the VO₂ Master is fully portable, battery powered, and doesn’t require hoses, tethers, or carts.
This allows us the flexibility to test any type of exercise you prefer: treadmill, bike, rower, stepper, even outside.
The only components of the VO2 Master are a heart rate monitor, mask, and head strap all adding up to about .5 pounds. The data is tracked and stored in an app on a phone, tablet, or watch.
The VO2 Master has been shown to be incredibly accurate compared to a traditional cardiopulmonary exercise testing (CPET) test in a lab setting.
A 2024 presentation, VO2 Assessment- Comparison of Mobile Modified Technique with Standard CPET, at the American Society of Anesthesiologists “demonstrated correlation between the mobile VO2 assessment and the gold standard CPET VO2. And this device could….provide an alternative tool to CPET in the estimation of maximum VO2.”
The study showed that results from the mobile VO₂ testing device matched closely with the results from a gold-standard CPET.
Another study from 2025 in the Scandinavian Journal of Medicine and Science in Sports, evaluated the VO2 Master against traditional CPET testing and showed “the COSMED Quark and VO2 Master Pro systems provide gas exchange and ventilatory data within an acceptable range for metabolic testing equipment that are both reliable and transferable between optimally performing devices.”
In practice, Olav Aleksander Bu, a highly respected Norwegian endurance coach, is widely recognized for bringing a science-driven, threshold-based training philosophy to elite athletics sees a 50 milliliter difference between the lab and the VO2 master.
A 50 ml difference between a VO₂ Master test and a lab-based VO₂ max test is insignificant for general fitness, health, and non-elite training purposes. For most adults, day-to-day natural fluctuation of VO2 max is already greater than 50 ml.
VO₂ max is measured in liters or ml per kilogram per minute.
If someone has a VO₂ max of:
• 3.0 L/min, a 50 ml difference is 1.6%
• 2.5 L/min, a 50 ml difference is 2%
In sports science:
• A <3–5% variance is considered excellent agreement between devices.
At Stretch Affect, we believe that true performance and long-term fitness come from understanding the body as a unified system. That’s why we integrate VO₂ max and Resting Metabolic Rate testing into our broader assessment process, looking at mobility, strength, movement quality, and metabolic efficiency as interconnected pieces of your personal fitness profile.
When you begin working with us, we may use VO₂ testing equipment to map out your cardiorespiratory and metabolic capabilities so we can see whether your physiology is supporting your goals or creating bottlenecks. This comprehensive starting point helps us understand not just what you can do physically, but how your body responds internally to the demands placed upon it.
With this data we can design your training and nutrition programs with precision.
• Your VO₂ max data helps us determine the exact intensities at which you should train — whether we're building your aerobic base, prescribing interval work, or managing recovery days.
• Your RMR gives us the most accurate measurement of how many calories your body uses at rest, allowing us to build nutrition plans that support fat loss, muscle gain, or performance goals.
• Your metabolic and aerobic profile also influences how we load and progress your strength and mobility work so that every part of your program aligns with your physiology.
As you train, your body adapts. That’s why we repeat VO₂ max and RMR testing every eight to twelve weeks. These retests allow us to track how your cardiorespiratory fitness changes, how your metabolic rate responds, and how your training is affecting your endurance.
Rather than relying on subjective feelings alone, you get measurable, objective evidence of improvement. These insights are not only motivating—they guide how we continue to evolve your programming.
What sets Stretch Affect apart is the way we combine mobility analysis, strength and power assessments, and metabolic testing to create a complete 360-degree understanding of your body. Many facilities can provide VO₂ max numbers, but numbers alone don’t create lasting change. We interpret your data, explain what it means, and translate it into actionable strategies for training, nutrition, and recovery.
While VO₂ max is a powerful tool, we recognize that it is only one part of the larger fitness landscape. Your muscular endurance, joint health, movement efficiency, neuromuscular coordination, sleep, stress, and lifestyle all influence how you perform and how you feel. VO₂ testing equipment helps us understand a crucial aspect of your physiology, but it becomes most powerful when integrated into our broader, holistic framework.
By combining mobility assessments, strength and power testing, and advanced VO₂ testing equipment, we create programs that are personalized, data-driven, and sustainable. Whether your goal is fat loss, muscle gain, improved athletic performance, or long-term health, VO₂ max and RMR testing give us the clarity needed to craft a training and nutrition strategy that truly works for you.
Stretch Affect is one of only three facilities in San Diego offering wireless VO2 max testing with the VO2 Master.
Scheduling is easy—reach out to us for a free initial consultation.
VO₂ testing equipment plays a central role in how we evaluate your physiology at Stretch Affect, because lasting fitness begins with breath. Your ability to deliver and use oxygen is the foundation of mobility, strength, endurance, recovery, and metabolic health.
This is why we’ve expanded our assessment process to include laboratory-grade VO₂ max and Resting Metabolic Rate (RMR) testing — giving you a clearer, more complete picture of how your body performs beneath the surface.
VO₂ testing equipment allows us to understand how efficiently you produce and utilize energy. With modern portable tools such as the VO2 Master Analyzer, you no longer need a hospital or lab to get accurate metabolic and cardiorespiratory insights. These tools let us measure your physiology in real time, in our space, and in the context of your training environment.
VO₂ max (maximal oxygen uptake) measures the maximum rate at which your body can consume oxygen during maximal exertion. It reflects the combined efficiency of your lungs, heart/circulatory system, and muscle-level oxygen use, giving a clear view of your real cardiorespiratory fitness and endurance capacity.
A higher VO₂ max means your body can deliver oxygen more effectively — supporting sustained effort, better stamina, faster recovery, and capacity for high-intensity training.
VO2 max is one of the strongest predictors of long-term health outcomes and longevity.
To test for VO2 max, you need to put your body under physical stress, typically using a treadmill or a bicycle while being hooked up with wires and tubes.
But at Stretch Affect, we use the portable VO2 Master. Unlike traditional metabolic carts, the VO₂ Master is fully portable, battery powered, and doesn’t require hoses, tethers, or carts.
This allows us the flexibility to test any type of exercise you prefer: treadmill, bike, rower, stepper, even outside.
The only components of the VO2 Master are a heart rate monitor, mask, and head strap all adding up to about .5 pounds. The data is tracked and stored in an app on a phone, tablet, or watch.
The VO2 Master has been shown to be incredibly accurate compared to a traditional cardiopulmonary exercise testing (CPET) test in a lab setting.
A 2024 presentation, VO2 Assessment- Comparison of Mobile Modified Technique with Standard CPET, at the American Society of Anesthesiologists “demonstrated correlation between the mobile VO2 assessment and the gold standard CPET VO2. And this device could….provide an alternative tool to CPET in the estimation of maximum VO2.”
The study showed that results from the mobile VO₂ testing device matched closely with the results from a gold-standard CPET.
Another study from 2025 in the Scandinavian Journal of Medicine and Science in Sports, evaluated the VO2 Master against traditional CPET testing and showed “the COSMED Quark and VO2 Master Pro systems provide gas exchange and ventilatory data within an acceptable range for metabolic testing equipment that are both reliable and transferable between optimally performing devices.”
In practice, Olav Aleksander Bu, a highly respected Norwegian endurance coach, is widely recognized for bringing a science-driven, threshold-based training philosophy to elite athletics sees a 50 milliliter difference between the lab and the VO2 master.
A 50 ml difference between a VO₂ Master test and a lab-based VO₂ max test is insignificant for general fitness, health, and non-elite training purposes. For most adults, day-to-day natural fluctuation of VO2 max is already greater than 50 ml.
VO₂ max is measured in liters or ml per kilogram per minute.
If someone has a VO₂ max of:
• 3.0 L/min, a 50 ml difference is 1.6%
• 2.5 L/min, a 50 ml difference is 2%
In sports science:
• A <3–5% variance is considered excellent agreement between devices.
At Stretch Affect, we believe that true performance and long-term fitness come from understanding the body as a unified system. That’s why we integrate VO₂ max and Resting Metabolic Rate testing into our broader assessment process, looking at mobility, strength, movement quality, and metabolic efficiency as interconnected pieces of your personal fitness profile.
When you begin working with us, we may use VO₂ testing equipment to map out your cardiorespiratory and metabolic capabilities so we can see whether your physiology is supporting your goals or creating bottlenecks. This comprehensive starting point helps us understand not just what you can do physically, but how your body responds internally to the demands placed upon it.
With this data we can design your training and nutrition programs with precision.
• Your VO₂ max data helps us determine the exact intensities at which you should train — whether we're building your aerobic base, prescribing interval work, or managing recovery days.
• Your RMR gives us the most accurate measurement of how many calories your body uses at rest, allowing us to build nutrition plans that support fat loss, muscle gain, or performance goals.
• Your metabolic and aerobic profile also influences how we load and progress your strength and mobility work so that every part of your program aligns with your physiology.
As you train, your body adapts. That’s why we repeat VO₂ max and RMR testing every eight to twelve weeks. These retests allow us to track how your cardiorespiratory fitness changes, how your metabolic rate responds, and how your training is affecting your endurance.
Rather than relying on subjective feelings alone, you get measurable, objective evidence of improvement. These insights are not only motivating—they guide how we continue to evolve your programming.
What sets Stretch Affect apart is the way we combine mobility analysis, strength and power assessments, and metabolic testing to create a complete 360-degree understanding of your body. Many facilities can provide VO₂ max numbers, but numbers alone don’t create lasting change. We interpret your data, explain what it means, and translate it into actionable strategies for training, nutrition, and recovery.
While VO₂ max is a powerful tool, we recognize that it is only one part of the larger fitness landscape. Your muscular endurance, joint health, movement efficiency, neuromuscular coordination, sleep, stress, and lifestyle all influence how you perform and how you feel. VO₂ testing equipment helps us understand a crucial aspect of your physiology, but it becomes most powerful when integrated into our broader, holistic framework.
By combining mobility assessments, strength and power testing, and advanced VO₂ testing equipment, we create programs that are personalized, data-driven, and sustainable. Whether your goal is fat loss, muscle gain, improved athletic performance, or long-term health, VO₂ max and RMR testing give us the clarity needed to craft a training and nutrition strategy that truly works for you.
Stretch Affect is one of only three facilities in San Diego offering wireless VO2 max testing with the VO2 Master.
Scheduling is easy—reach out to us for a free initial consultation.
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