I need help

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Nessc
Nessc Posts: 137 Member
in Health and Weight Loss
understanding my polar HRM. After doing the ownzone before exercise, it will give me, for example, a range of 126-161 for my heart rate zone. Then after 25 minutes of exercise and reaching 200 calories burned, it will change the maximum heart rate zone to 143. Why does it do this? :huh:

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