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How does a heart rate monitor to calculate the calories you burn?

I understand you can not calculate how calories hotbranded so your heart What does a heart monitor used to show the calories burned?

It is only an estimate. Most request the size / weight and age. It is therefore an estimate based on heart rate and other variables. It is only an estimate, however.

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Garmin 010-10997-00 Edge 705 Heart Rate Monitor Strap $40.95

Garmin Foretrex 401 Oregon 300 Heart Rate Monitor Strap $40.95

Garmin FR60 Colorado 400t Heart Rate Monitor Strap $40.95

Garmin 010-10997-00 Forerunner Heart Rate Monitor Strap $40.95

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