The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
And the only way heat gets out of a muscle is in the blood. And your muscle metabolism can go up 50 or 60-fold during anaerobic activity. That means the heat production in the muscle goes up 50 or 60-fold. The blood flow to that muscle cannot go up 50 or 60-fold.
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And your muscle metabolism can go up 50 or 60-fold during anaerobic activity. That means the heat production in the muscle goes up 50 or 60-fold.
For the anorobic athlete and let's say they're doing several they're doing several sets, their core temperature is not going to rise that fast because it's only uh certain muscles which are being used but the temperature of those muscles will go up. So it's a local effect.
And your muscle metabolism can go up 50 or 60fold during anorobic activity. That means the heat production in the muscle goes up 50 or 60fold.