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by nrivadeneira 4615 days ago
I haven't looked into any research about this, but anecdotally I find this to not be true. Having peaked at 215 lbs. and ~12% body fat at 5' 11", (I'm now closer to 195 lbs. and ~10% body fat) I'd say that I'm in the top 1% in terms of muscle mass. I am often very hot. My theory is that because of the added muscle mass (which requires much higher food intake), I'm metabolizing food at a higher rate and thus generating more heat. I don't know if this is actually the case, but it's my theory.

This may not be the case for people who are fit in a more cardiovascular sense.