Here we leave as we calculate our theoretical HRmax, through the following formula (used as an example a person of 40 years):
HRmax = 220 - age of the subject ; HRmax = 220-40 = 180 l / m
Once solved our theoretical HRmax, we must identify areas of work, which are:
Zone I: -70% 180 = -126 l / m
Zone II: 70-80% of 180 = 126-144 l / m
Zone III: 80-90% of 180 = 144-162 l / m
Zone IV: + 90% = + 162 l / m
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