Cardiorespiratory Fitness and Long-Term Mortality: Updated Meta-Analysis

Researchers pooled data from 37 prospective cohort studies comprising 286,000 participants to quantify the dose-response relationship between cardiorespiratory fitness (CRF) and all-cause mortality.

• Low CRF was associated with a 2.4× higher mortality risk compared to high CRF (HR 2.41, 95% CI: 2.18–2.67).
• Each 1-MET improvement in VO₂ max corresponded to 11–17% reduction in all-cause mortality.
• Benefits were consistent across age groups, sexes, and populations with comorbidities.
• CRF predicted mortality more strongly than hypertension, smoking, or diabetes in head-to-head comparisons.

VO₂ max testing should be considered a standard component of longevity assessment. Unlike many biomarkers, cardiorespiratory fitness is directly improvable through structured exercise — making it both diagnostic and therapeutic.

KCM integrates VO₂ max assessment into comprehensive longevity evaluations. We use results to calibrate exercise prescriptions, set realistic improvement targets, and track physiological progress over time — not merely to assign a fitness category.