Heart rate reserve (HRR) is the difference between resting heart rate (HRrest) and maximum heart rate (HRmax).
HRR = HRmax - HRrest
Heart rate reserve is used when determining exercise heart rates.
The Karvonen formula is used to calculate exercise heart rate at a given percentage training intensity. Add the given percentage of heart rate reserve to the resting heart rate.
Exercise HR = % of target intensity (HRmax – HRrest) + HRrest
For example: Target intensity 70 % HRR for a person with HRmax 201 bpm and
HRrest 50 bpm
Exercise HR= 70% (201-50=151) + 50
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