What Is VO2 Max and Does It Actually Matter for Everyday Athletes?

Q: What is Vo2 Max?

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Q: Is Vo2 Max important for endurance athletes?

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Q: What's a good Vo2 Max for Males vs Females?

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VO2 max is the maximum rate at which your body can consume oxygen during intense exercise.

June 12, 2026 4. min read

Ella Ransley Sport Science Lead

“An athlete with a VO2 max of 65 mL/kg/min who can sustain 85% of that at threshold will generally outperform an athlete with a VO2 max of 70 mL/kg/min who can only sustain 75%
— Ella, Sports Scientist ”

Overview

VO2 max measures how much oxygen your body can use during maximal exercise. VO2 max measures how much oxygen your body can use during maximal exercise. It's a useful fitness indicator, but lactate threshold and running economy matter just as much for actual performance. Most people can improve it 15–25% through intervals and aerobic base training, though gains slow with experience. For recreational athletes, focus less on the number and more on the training that improves it, a tested score is most valuable as a periodic baseline to track progress objectively.

If you've spent any time in endurance sport circles, you've almost certainly encountered the term VO2 max. It gets thrown around in training apps, smartwatch metrics, and performance conversations with the kind of reverence usually reserved for race times and power numbers. But for most athletes outside of an elite environment, it remains a number they've heard of, vaguely understand, and aren't entirely sure what to do with.

Here's a clear-eyed look at what VO2 max actually is, what it tells you, and, perhaps more importantly, what it doesn't.

What VO2 Max Actually Measures

VO2 max is the maximum rate at which your body can consume oxygen during intense exercise. It's expressed in millilitres of oxygen per kilogram of bodyweight per minute (mL/kg/min), which makes it a relative measure, meaning a heavier athlete can have a high absolute oxygen uptake but a lower VO2 max than a lighter athlete with the same engine.

The physiological components that determine VO2 max include how much blood your heart can pump per beat (stroke volume), how fast your heart beats at maximal effort (heart rate), how efficiently your lungs transfer oxygen into the blood, and how effectively your muscles extract and use that oxygen. It's a whole-system measure, which is part of why it's considered such a useful indicator of overall cardiovascular fitness.

What a Good VO2 Max Looks Like

VO2 max varies significantly by age, sex, and training status. As a rough guide:

For men, an untrained score might sit around 35–45 mL/kg/min, a recreational endurance athlete around 50–60, a competitive club athlete around 60–70, and elite endurance athletes, think professional cyclists and distance runners, often above 70, with exceptional outliers recorded above 90.

For women, scores are typically 10–15% lower across comparable groups due to differences in haemoglobin concentration, heart size relative to bodyweight, and body composition, though female athletes at the elite level still record scores that would be impressive by any standard.

The key point is that context matters enormously. A VO2 max of 52 mL/kg/min means something very different for a 55-year-old who took up running three years ago than for a 28-year-old training full time.

Does VO2 Max Predict Performance?

Yes, but imperfectly, and with important caveats.

Within a group of similarly trained athletes, VO2 max is a reasonable predictor of endurance performance capacity. The athlete with the higher VO2 max tends to have a larger aerobic ceiling to work within.

But VO2 max alone doesn't determine who crosses the finish line first. Two athletes can have identical VO2 max scores and perform very differently, because how much of that ceiling you can actually sustain, your lactate threshold as a percentage of VO2 max, matters just as much. An athlete with a VO2 max of 65 mL/kg/min who can sustain 85% of that at threshold will generally outperform an athlete with a VO2 max of 70 mL/kg/min who can only sustain 75%.

Running economy (how efficiently you convert oxygen into forward motion) adds another layer of complexity. Some athletes are simply more mechanically efficient than others, meaning they use less oxygen at a given pace, which can compensate meaningfully for a lower VO2 max ceiling.

Can You Actually Improve It?

Yes, though the extent to which VO2 max is trainable varies between individuals and is partly determined by genetics. Research suggests that most people have the capacity to improve their VO2 max by 15–25% through structured training, with the greatest gains typically coming from high-intensity interval work (sessions at or near VO2 max effort) combined with a solid aerobic base.

The returns diminish as training age increases. A beginner runner will see rapid VO2 max improvements in their first year. A seasoned athlete who's been training consistently for a decade might see only marginal gains despite significant effort.

So Does It Actually Matter for Everyday Athletes?

Honestly, for most recreational endurance athletes, VO2 max as a specific number matters less than the training practices that happen to improve it. If you're building an aerobic base, doing structured interval sessions, and recovering well, your VO2 max will trend upward, and your performance will follow.

Where a lab-tested VO2 max becomes genuinely valuable is as a baseline. Knowing your score at a given point in your training, and retesting periodically, gives you an objective measure of whether your training is producing the cardiovascular adaptation you're looking for. It removes the guesswork.

Combined with lactate profiling and sweat testing, it forms part of a complete picture of your physiology, one that makes every training decision more informed and every race plan more precise.

FAQ's

What is Vo2 Max?

VO2 max is the maximum rate at which your body can consume oxygen during intense exercise. It's expressed in millilitres of oxygen per kilogram of bodyweight per minute (mL/kg/min), which makes it a relative measure, meaning a heavier athlete can have a high absolute oxygen uptake but a lower VO2 max than a lighter athlete with the same engine.

Is Vo2 Max important for endurance athletes?

Honestly, for most recreational endurance athletes, VO2 max as a specific number matters less than the training practices that happen to improve it. If you're building an aerobic base, doing structured interval sessions, and recovering well, your VO2 max will trend upward, and your performance will follow.

What's a good Vo2 Max for Males vs Females?

For men, an untrained score might sit around 35–45 mL/kg/min, a recreational endurance athlete around 50–60, a competitive club athlete around 60–70, and elite endurance athletes, think professional cyclists and distance runners, often above 70, with exceptional outliers recorded above 90.

For women, scores are typically 10–15% lower across comparable groups due to differences in haemoglobin concentration, heart size relative to bodyweight, and body composition, though female athletes at the elite level still record scores that would be impressive by any standard.

Sources & Citations

"Bassett, D.R. & Howley, E.T. (2000). Limiting factors for maximum oxygen uptake and determinants of endurance performance. Medicine & Science in Sports & Exercise, 32(1), 70–84. https://pubmed.ncbi.nlm.nih.gov/10647532/ The foundational paper on the physiological determinants of VO2 max — cardiac output, haemoglobin, and muscle oxygen extraction. The standard reference for the "whole system measure" claim."

" Bouchard, C. et al. (1998). Familial aggregation of VO2 max response to exercise training: results from the HERITAGE Family Study. Journal of Applied Physiology, 87(3), 1003–1008. https://pubmed.ncbi.nlm.nih.gov/9729905/ The heritability of VO2 max is 0.43 to 0.72, meaning genetic factors account for 43–72% of differences in values between individuals. Directly supports the genetic component claim."

"Bacon, A.P. et al. (2013). VO2 max trainability and high intensity interval training in humans: a meta-analysis. PLOS ONE. https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0073182 Studies using interval training or combined interval and continuous training have reported mean increases in VO2 max of up to approximately 1.0 L/min. Supports the 15–25% trainability range with high-intensity work."