VO2 Max
VO2 max is the maximum rate at which a person can take in and use oxygen during intense exercise, a key measure of aerobic capacity.
VO2 max stands for maximal oxygen uptake.
Definition
VO2 max is the highest rate at which the body can consume oxygen during progressively harder exercise, usually expressed in millilitres of oxygen per kilogram of body weight per minute. It reflects the combined capacity of the heart, lungs, blood, and muscles to deliver and use oxygen, and is treated as a benchmark of aerobic fitness. It can be measured directly in a laboratory using expired-gas analysis, or estimated from field tests and wearable data.
In training, 'VO2 max intervals' are hard efforts performed near this ceiling to stress and improve oxygen uptake. VO2 max is related to but distinct from the lactate threshold: the former is a maximal capacity, while the latter describes the intensity an athlete can sustain. Genetics, training history, and altitude all influence the value.
Where you’ll hear “vo2 max”
Sports that use this term:
Running
The most accessible endurance sport — no venue, just shoes and the open road or trail.
Cycling
A low-impact endurance sport that doubles as transport, exercise and adventure.
Swimming
A full-body, low-impact endurance sport suitable for almost every age and ability.
How it connects
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Commonly confused with
Close enough to be mixed up — the distinction is worth knowing.
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Sports science
- Aerobic and anaerobic energyThe difference between energy the body produces with oxygen and energy it produces without it — a core idea behind why different efforts feel and last so differently.
- Force and powerThe difference between how much force the body can produce and how quickly it can produce it — the mechanics behind strength and explosiveness.
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How this page is maintained
- Content type
- Term
- Provenance
- Tier A — evergreen educational
- Verified external sources
- 0
- Content updated
- 2026-09-01
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