What the Number Means
VO2 max integrates lungs, blood, heart, and muscles into one figure: how much oxygen the whole system can deliver and use at maximal effort. It is measured in millilitres per kilogram per minute.
Lab testing requires a treadmill and gas analysis; field estimates — the Rockport walk test or resting-heart-rate methods — approximate it well enough for tracking.
Standards by Age and Sex
Untrained young men average 35–40 ml/kg/min, women about 5–10 lower on the same scale. 'Good' for a 30-year-old man is 45–54; 'excellent' is 55+. Each decade costs roughly 5–10% if you do nothing.
The encouraging part: sedentary people who train for 3–6 months routinely add 15–25%, and older adults respond just as well as younger ones to the same stimulus.
Why It Predicts Longevity
In cohort studies, low fitness rivals smoking and diabetes as a mortality risk factor — moving from the bottom fitness quartile to the second alone cuts death risk dramatically.
The best-proven training recipe: 4×4-minute intervals at 90–95% of max heart rate, twice weekly, on a base of easy aerobic volume.
Sources
FAQ
What is a good VO2 max for my age?
Roughly 45–54 ml/kg/min for young men and 38–46 for women is 'good', with norms stepping down ~10% per decade after 30.
How fast can VO2 max improve?
Untrained people can gain 15–25% in 3–6 months with consistent aerobic training; the fastest gains come from interval work.
Why does VO2 max matter for health?
It is among the strongest single predictors of all-cause mortality — improving fitness cuts death risk more than most medication targets.
Important disclaimer: This guide is educational information, not a substitute for professional professional advice. Discuss your individual situation with a qualified professional.