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Seems like you could do a great confirmation study with participants in Bikram / hot yoga where the temps are 105F for 90 mins with ~50% humidity.

I'm going to go out on a limb and say the sauna cohort and the Bikram cohort are two extremely different sets of individuals with lots of different behaviors, so if the same effect was found in regular Bikram yogis a lot of variables might be able to be eliminated.

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Saunas are much warmer than that. Regular sauna temperature in Finland is around 60°C - 90°C (which is around 140-190°F). This is the air temperature at which pretty much everybody goes to the sauna here, including the young, the old and sometimes even the ill.

Fair enough to make the comparison perhaps a poor one. However I don't think that people do yoga in saunas, but rather remain seated, correct? The point I'm getting at is: isn't the question "what's the net rise in body temperature?" In hot yoga, the room isn't as hot as a sauna but you're exercising strenuously, so that the body becomes about as hot as you can safely heat a body, kinda like a sauna.

That temperature actually sounds like a break in Texas during the summer.

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