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  1. #1
    Newbie erhan's Avatar
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    How do HRMs calculate calories burned?

    I was just thinking about how accurate they are, but I'm a little confused.

    The only input variable is the users heart rate. There are also pre-entered/constant values like age, resting HR, max HR, and weight (not sure how they are used for the calculation).

    Ok, here is what confuses me. Let's say in reality I am burning 700 calories in one hour, with an average HR of 160 BPM. After some time, I become more powerful, none of the constant values change (age, weight, etc.), and I am burning, say, 1000 calories in one hour, with the same average HR (160).

    If what I said above is correct, then a HRM has no accurate method of calculating the calories burned. Am I right?

    Also, does anyone know a mathematical formula for calculating calories burned, based on HR?

    Thanks

  2. #2
    Senior Member socalrider's Avatar
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    Most HRM ask you to input height / weight and age..

    From that and effort during an exercise it gives you calories burned.. I always felt that they estimate a little on the high side..

  3. #3
    Climbing Fool terrymorse's Avatar
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    The Polar 700 series HRMs ask you to enter your personal VO2max figure, which scales linearly with power and calorie consumption. More oxygen consumed = more calories consumed.
    Managing Director, Undiscovered Country Tours

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