Heart rate recovery (HRR)

Heart rate recovery (HRR) is how fast your heart rate drops after you stop hard exercise. It is measured in the first minute (HRR1) or the first two minutes (HRR2) after a peak or symptom-limited test. Early on, the drop reflects your parasympathetic (vagal) nerve switching back on. The sympathetic side withdrawing contributes a bit later. The landmark Cleveland Clinic cohort tested this (Cole et al., NEJM 1999) in 2,428 patients on a treadmill. An HRR1 of 12 beats per minute or fewer (with a 2-minute cool-down) came with a 4-fold higher all-cause death over 6 years, in the raw analysis. After adjusting for exercise capacity, beta-blockers, and standard heart risk factors, the relative risk was still 2.0. A normal HRR1 in healthy adults is usually above 18 bpm. Values under 12 bpm are clinically abnormal. HRR is reproducible and cheap, and it is a useful add-on to your peak VO2.

Last reviewed: June 22, 2026

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