Heart Rate Recovery
Calculate HRR at 1 and 2 minutes. Classification, autonomic health. NEJM 1999. Health note for abnormal values.
Peak − 1min • >40 Excellent • <12 Consult
Parasympathetic reactivation. Strongest CV death predictor.
Preset Scenarios
HR Decay Curve
HRR by Time
For educational and informational purposes only. Verify with a qualified professional.
HRR = Peak HR − HR at 1min (or 2min). The NEJM 1999 study found HRR <12 bpm at 1 minute predicts mortality. >40 bpm = excellent, 30–40 = good, 20–29 = average, <20 = concerning. HRR is the strongest predictor of cardiovascular death in exercise testing. Parasympathetic reactivation begins within 30 seconds.
📋 Key Takeaways
- • 12 bpm threshold — NEJM 1999 mortality predictor
- • >40 excellent, 30–40 good, 20–29 average, <20 concerning
- • Parasympathetic reactivation begins within 30 seconds
- • Strongest predictor of CV death in exercise testing
💡 Did You Know?
📖 How It Works
HRR Formula
HRR = Peak HR − HR at 1 min (or 2 min) post-exercise. Measure peak HR at exercise stop, then HR at exactly 1 and 2 minutes. Standing recovery is standard for stress tests.
Classification (1-min)
>40 bpm = excellent, 30–40 = good, 20–29 = average, 12–19 = below average, <12 = concerning. NEJM 1999: <12 bpm at 1 min associated with increased mortality.
Autonomic Basis
Fast recovery = healthy parasympathetic reactivation. Slow recovery = possible sympathetic dominance, stress, or autonomic dysfunction. Consult physician if abnormal.
🎯 Expert Tips
Measure consistently
Same posture (standing vs seated), same timing. Use chest strap for accuracy. Avoid talking during recovery.
Track over time
HRR improves with fitness. Declining HRR may indicate overtraining, illness, or stress. Use trends, not single tests.
Don't ignore <12
HRR <12 bpm at 1 min warrants medical consultation. NEJM 1999 linked it to mortality. One reading may be artifact; confirm with physician.
2-min adds context
2-min HRR confirms 1-min. >66 excellent, 50–65 good. Useful for fitness tracking and clinical assessment.
⚖️ Comparison Table
| 1-min HRR | Classification | Autonomic | Action |
|---|---|---|---|
| >40 | Excellent | Healthy | ✅ |
| 30–40 | Good | Normal | ✅ |
| 20–29 | Average | Acceptable | ⚠️ |
| 12–19 | Below average | Monitor | ⚠️ |
| <12 | Concerning | Abnormal | ❌ |
📊 Infographic Stats
📚 Official Sources
⚠️ Disclaimer: HRR <12 bpm at 1 minute has been associated with increased mortality (NEJM 1999). This calculator is for educational purposes only. Abnormal values warrant medical consultation. Not a substitute for professional cardiovascular assessment or medical advice.