VO₂ max on Oura: what cardio capacity means and how to raise it

What VO₂ max actually measures

It’s the ceiling on how much oxygen your muscles can take in and use when you’re working hard. A higher ceiling means your heart, lungs and muscles move and use oxygen more efficiently — which is why VO₂ max tracks so closely with endurance, and why it’s one of the strongest predictors of long-term health in the research, not just athletic performance.

Why it’s only meaningful by age and sex

VO₂ max declines naturally with age and differs between men and women, so a raw number is uninterpretable on its own. A VO₂ max of 42 is roughly average for a man in his thirties and genuinely excellent for someone in their sixties. That’s why a fair read grades your value against reference percentiles for your exact age and sex, rather than against a single “good” line.

How Oura estimates it

A ring can’t run you through a lab test with a mask on, so the estimate is inferred from your heart-rate response during walks, runs and workouts — how hard your heart works to move you at a given pace. It’s an estimate, not a lab measurement, but a consistent one is plenty to track the trend that matters.

The training that moves it

Two ingredients raise VO₂ max for most people: a base of easy “zone 2” cardio — conversational-pace efforts you can sustain — plus a smaller dose of harder intervals that push near your ceiling. Volume of easy work builds the engine; the hard efforts stretch the top end. Consistency over months, not heroics in a single week, is what shows up in the number.

Vitra grades your Oura cardio capacity against established percentiles for your age and sex, folds it into your overall Body Score, and — because it weights toward your weakest system — will tell you in plain English when cardio fitness is the thing holding your number back.

Frequently asked questions