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I know this thread just got necro'd by a spambot but I gotta throw in my 2 cents.
From my understanding, Heat will cause your arteries and other bloodstream vessels to dialate/expand. Which makes your heart work harder to get blood flowing since it will lower your blood pressure.
I'm not sure if this actually helps or hinders the oxygenation, but I think that's the general idea of it, trying to increase oxygen and bloodflow to your muscles and such.
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