Does a higher VO2max really mean a longer life?

The claim

A higher VO2max means a longer life.

What the evidence says

In 122,007 adults who had a treadmill test, followed for a median of 8.4 years, risk-adjusted mortality was lowest in the fittest group: elite vs low fitness HR 0.20 (95% CI 0.16–0.24), elite vs high HR 0.77 (0.63–0.95). Elite = top 2.3% of age- and sex-matched peers. A meta-analysis of 33 cohorts (102,980 people) found each extra MET of fitness, roughly 1 km/h faster running, went with 13% lower risk of dying: RR 0.87 (0.84–0.90).

The numbers

• Mandsager 2018: 122,007 patients referred for a treadmill test, median follow-up 8.4 years, 13,637 deaths; elite vs low fitness HR 0.20 (0.16–0.24), elite vs high HR 0.77 (0.63–0.95); low vs elite HR 5.04 (4.10–6.20).
• Kodama 2009: 33 cohorts, 102,980 participants, 6,910 deaths; per +1 MET RR 0.87 (0.84–0.90); low vs high fitness RR 1.70 (1.51–1.92).
• Observational; fitness estimated from treadmill performance.

Verdict: Mostly proven

Fitness is a strong marker of long-term survival. That raising it lowers your risk by the same amount isn’t proven.

Why only this far: Observational data, a selected group (patients referred for treadmill tests), estimated rather than measured fitness, no trial on deaths.

Evidence level B: Large cohort studies. How verdicts work.

What we don’t know

The people tested were patients referred for a treadmill test, and fitness was estimated. These studies observed people. They didn’t change anyone’s fitness and then count deaths.

Sources

Checked 15 Oct 2026. Every link opens the original paper or its PubMed record.

1. Mandsager et al., JAMA Netw Open 2018Retrospective cohort (n = 122,007, treadmill test)DOI 10.1001/jamanetworkopen.2018.3605 · PubMed 30646252
2. Kodama et al., JAMA 2009Meta-analysis of 33 cohortsDOI 10.1001/jama.2009.681 · PubMed 19454641

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