I called the support number. Here is what I found out: 1. Go to the Samsung Health app on my phone. 2. Scroll down and press on Heart rate. 3. Click on the "i" icon (i on a small round circle) 4. There is a long explanation about heart rate. There are two things there related to my questions as follows: A. Exercise heart rate zones are Moderate (50-69%), Vigorous (70-90%), and Maximum (91-100%). B. There is a statement that "Your maximum heart rate can be estimated by subtracting your age from 220." There is also a statement that intensity (that is, the zones) are a comparison of my current heart rate against "the estimated maximum heart rate for your age." It could be inferred that the 220 formula is used to calculate the maximum heart rate (although it is not actually stated). I asked the support rep for the ability to enter my own maximum heart rate, seeing that the App's calculation is 32 beats lower than my actual maximum heart rate, which in turn means all the calculated zones are not close to being correct. She will forward this suggestion to the developers.
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How are my heart rate zones (maximum, vigorous, moderate) calculated? I assume the zones are calculated as percentages of my maximum heart rate, based on a formula: the Info button says the max can be estimated by subtracting age from 220)? My profile on the Samsung Health app has my approximate birth date and therefore has my age. The above formula does not work for me: the formula says my max should be 153 (220 minus 67), but during workouts, this watch and other fitness watches have recorded maximums of 185 or more. (Just to be clear, I am aware that the maximum heart rate recorded during a workout is not necessarily my maximum possible heart rate.) Can I enter my own max? (A workaround: I can change my birthdate in Samsung Health, making me 32 years younger!)
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