HR Zone Pro
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Calculation Method
Karvonen (Heart Rate Reserve)
Max HR
bpm
Resting HR
bpm
Karvonen applies percentages to Heart Rate Reserve (Max - Resting), then adds resting heart rate back. It is a different convention from percentage of Max HR.
Zone
Range
Zone 1: Recovery
125 - 138 bpm
Zone 2: Endurance
139 - 151 bpm
Zone 3: Aerobic
152 - 164 bpm
Zone 4: Threshold
165 - 177 bpm
Zone 5: VO2 Max
178 - 190 bpm