Reply to Working out with the fan on .. less sweat = less calories burned?

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[quote=Anonymous][quote=Anonymous]This is why I don't think it's a dumb question.

I have a walking route I use often for exercise. When I do it at the exact same pace, I burn more calories when it is hotter out according to my apple watch. For example, on an 85 degree day I might burn 245 calories on the 3 mile walk. But if it's 50 degrees out, even if I move at the same pace for the same distance, I only burn 190 calories.

Why is that? I've always assumed because my body is working harder because of the added element of heat in the environment. No? [/quote]

I'm concerned with your critical thinking here.  Firstly, your apple watch has zero clue how many calories you actually burned.  You know that, right?  Your apple watch has an algorithm that guesses how many calories you burned based on heart rate, time, type of activity, and the information you've given it about you (weight, age, sex).  That algorithm is based on lab research, but its just a guess.  Secondly, that algorithm relies in part on your heart rate.  Your heart rate will be higher on a warm day than a cold day.  That's because your heart has to pump faster to cool you.  That faster heart rate in the heat isn't because your body is burning more energy, it's because it's harder for your body to get rid of the heat it's generating.[/quote]

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