What it means
VO2max is the maximum rate at which your body can take in, transport and use oxygen during exhaustive exercise, expressed in millilitres of oxygen per kilogram of body weight per minute. It integrates lung function, cardiac output, blood volume, capillary density and mitochondrial capacity — which is why it summarises so much.
Typical values: a sedentary 40-year-old man around 35–40 ml/kg/min, a woman 28–33; elite endurance athletes 70–90. It falls roughly 10% per decade after 30 in sedentary people and about half that in those who train.
Why it matters for longevity
A higher VO2max means a bigger reserve between what daily life demands and what the body can supply — the reserve that keeps a person independent in their eighties. The cohort data show no upper limit to the benefit, and the gap between the bottom and top fitness groups is larger than the gap between smokers and non-smokers.
What the evidence says
Mandsager 2018 (JAMA Network Open): 122,000 adults treadmill-tested at the Cleveland Clinic, followed for a median 8 years. Compared with the fittest group, the least fit had about five times the mortality; even moving from the bottom 25% to the 25–50% band was associated with roughly 50% lower mortality. Kokkinos 2022 (750,000 US veterans) replicated the pattern with no ceiling.
Trainability: in HERITAGE, 20 weeks of endurance training raised VO2max by an average 15–20%, with wide individual variation. Robinson 2017 showed older adults gained as much as young ones from twelve weeks of intervals. A mix of zone-2 volume and high-intensity intervals is the best-supported recipe.
How to measure or use it
- Gold standard: a lab test with gas analysis on a treadmill or bike (about 60–90 euros). Watches estimate it within roughly 5–10%, and are fine for trends.
- Target: the top 25% for your age and sex, which for a 45-year-old man is roughly 45+ ml/kg/min and for a woman 38+. Each 1 ml/kg/min is worth about 10% lower mortality in the Cleveland data.
- Recipe: three to four hours a week of zone 2 plus one interval session (4 × 4 minutes hard); retest every six months.
Related
- VO2max and longevity — the full article, with the cohorts and the training plan
- Mitochondria and energy — what intervals do to the engine
- The longevity protocol — VO2max as the primary target
Frequently asked questions
What is a good VO2max for my age?
Top 25% for your age and sex is the useful target: roughly 45+ for a 45-year-old man, 38+ for a woman, 40+ and 33+ a decade later.
How fast can I raise it?
Typically 10–20% in three to six months from a sedentary start, slower once trained. Older adults respond as well as young ones.
Is a watch estimate accurate?
Within about 5–10% of a lab test, and consistent enough to track trends. Use a lab test for a baseline if you want the real number.
Want this applied to your own numbers?
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