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Yes Harry, the Karvonen HRR method (heart rate reserve) is considered to be the better one to use because it reflects resting pulse, but to make things less complicated for the average person, the 60-85% method works pretty well. For those who want to know, the HRR method uses the resting pulse in the calculations. The better (lower) your pulse is, the harder you have to work to increase your workload.
220- your age
example 20 yo.
estimated max heart rate=200bpm
if this person's pulse was 60 bpm, take 60 from 200, multiply result by target of 60-85%, and then add in pulse to get number
200-60=140 140x85%= 119+60 bpm=179 estimated 85% working level.
normal method=200x85%=170
if person was resting pulse 90 bpm, then total would be 183.5 for 85% at HRR.
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