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burning muscle
So, I've been told by a few people that when doing aerobic workouts you should watch your heartrate and not let it get too high. I'm told that once your heartrate goes too high you start to burn muscle instead of fat.
I guess I'm just wondering how true this is. When I mention this to some friends they say they've never heard of it. Anyone know details behind this? Is it just a way to sell heartrate monitors or is it for real?
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