How does VO2max compare to resting heart rate as a predictor of longevity?

VO2max is a stronger predictor of all-cause and cardiovascular mortality than resting heart rate, though both are meaningful, because VO2max reflects the integrative capacity of the entire oxygen delivery and utilization system (lungs, heart, vasculature, mitochondria) while resting heart rate primarily reflects cardiac autonomic tone and cardiac efficiency (Kokkinos et al., JACC, 2022).

Both metrics improve with aerobic training, and both are worth tracking. The practical superiority of VO2max as a metric is that it has been directly compared against all major cardiovascular risk factors in the same datasets and comes out as the dominant predictor. Resting heart rate is more easily measured (by any wearable, any time) and is a valid daily indicator of cardiac recovery and training adaptation. They are complementary. For annual cardiovascular risk assessment, VO2max (estimated or measured) should be included alongside blood pressure, lipids, and hs-CRP.

Honesty Scale: Solid (1) for VO2max superiority over resting heart rate as a mortality predictor in comparative analyses.

What to do: Track both, resting heart rate for daily variability (wearable) and VO2max for quarterly fitness assessment (walk/run test). A declining resting heart rate trend over 3 months is a leading indicator of improving VO2max.

For the full picture, read The VO2max/Zone 2 Deep Dive