Cardiopulmonary Function Assessment Scores (CPET)

Heart Rate Recovery (HRR) Calculator

Clinical calculation support · Verify results before clinical use

Calculate heart rate recovery

Enter peak exercise heart rate and the heart rate measured at 1 and 2 minutes of recovery.

—HRR 1 min

Use the heart rate recorded at peak exercise, not an age-predicted maximum unless that is the measured value available.

Recovery protocol

Select the protocol used immediately after exercise. Cutoffs depend on the recovery protocol and exercise-test method.

—HRR 1 min
One-minute heart rate recovery

Enter valid values

HRR is calculated as peak exercise heart rate minus recovery heart rate.

ParameterCalculated valueReference interpretation
HRR at 1 minute—Awaiting input
HRR at 2 minutes—Awaiting input

The 1-minute cutoff is protocol-dependent. No universally standardized 2-minute cutoff is applied here.

Clinical interpretation

Heart rate recovery (HRR) is the decrease in heart rate from peak exercise to a specified time during recovery. It reflects autonomic recovery, including parasympathetic reactivation and withdrawal of sympathetic drive. A blunted response has been associated with adverse prognosis in selected populations undergoing exercise testing.

How the calculation works

HRR at time point (bpm) = peak exercise heart rate − heart rate at that time point. The result is a heart-rate decrease, not the absolute heart rate at recovery.

Cutoff considerations

  • In the cohort studied by Cole et al., HRR at 1 minute of 12 bpm or less was considered abnormal during a protocol that included a treadmill cool-down.
  • Other exercise-test protocols use different thresholds; an 18-bpm threshold has been used in studies with an abrupt stop. Interpret the result according to the protocol and the population in which the threshold was validated.
  • There is no single universally standardized cutoff for HRR at 2 minutes. This calculator reports the numeric 2-minute decrease without assigning a normal/abnormal label.

Clinical use and limitations

Interpret HRR alongside exercise capacity, the exercise-test protocol, symptoms, blood-pressure response, ECG findings, medications, comorbidities, and the clinical context. HRR is a prognostic marker, not a stand-alone diagnostic test for ischemic heart disease or autonomic dysfunction.

References

Cole CR, Blackstone EH, Pashkow FJ, Snader CE, Lauer MS. Heart-rate recovery immediately after exercise as a predictor of mortality. N Engl J Med. 1999;341:1351–1357. DOI: 10.1056/NEJM199910283411804; PMID: 10536127.
Javorka M, et al. (review article). Heart rate recovery assessed by cardiopulmonary exercise testing in patients with cardiovascular disease: relationship with prognosis. Int J Environ Res Public Health. 2023;20(6):4678. Full text at PubMed Central.
Clinical disclaimer: This calculator provides a numerical HRR estimate and a protocol-specific reference interpretation. It does not replace professional assessment or the full interpretation of an exercise test. Thresholds vary with protocol and population; use local laboratory standards and clinical judgement.
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