Karvonen Heart Rate Calculator
Dedicated implementation of Dr. Martti Karvonen's 1957 Heart Rate Reserve equation
Target HR = (128 bpm reserve × 0.75) + 60 bpm rest
Mathematical Formula & Scientific Methodology
Formula: Classical Karvonen Formula (1957)
Target HR = [(HRmax - HRrest) × % Intensity] + HRrestSeminal 1957 publication demonstrating that cardiovascular training threshold occurs around 60% of reserve rather than 60% of total max.
Model Assumptions
- Resting HR recorded in a rested state
Variables & Standard Units
| Symbol | Physiological Meaning | Unit |
|---|---|---|
| HRmax | Max heart rate | dimensionless |
| HRrest | Resting heart rate | dimensionless |
Scientific Limitations
- Intensity should be adapted during illness or excessive heat
Peer-Reviewed Scientific Citations
The effects of training on heart rate; a longitudinal study (1957)
Karvonen MJ, Kentala E, Mustala O (1957) — Annales Medicinae Experimentalis et Biologiae Fenniae, 35(3), 307-315
Key Finding: Target HR = ((HRmax - HRrest) * %Intensity) + HRrest. Uses Heart Rate Reserve (HRR) to individualize training zones.
Frequently Asked Questions
Related Calculators & Next Steps
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