Question: Concern the maximum heart rate (MHR), which is the maximum number of times a persons heart can safely beat in one minute. If MHR is
Concern the maximum heart rate (MHR), which is the maximum number of times a person’s heart can safely beat in one minute. If MHR is in beats per minute and a is age in years, the formulas used to estimate MHR are

Experiments suggest that the female MHR decreases by 12 beats per minute by age 21, and by 19 beats per minute by age 33. Is this consistent with MHR being approximately linear with age?
For females: MHR = 226 - a, For males: MHR = 220 - a.
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