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I've also been wondering this.. So far my conclusion is that the heat dilates your blood vessels. Which lowers blood pressure. Which makes the heart pump faster to get the same amount of Oxygen to where it needs to be.
Blood vessels dilate from Heat -> Lower blood pressure -> faster heart rate.
Not to mention you are standing up and doing some sort of cardio by scrubbing yourself and constantly moving.. I suspect it's normal to be around 120bpm in the shower, depending on water temperature, but I'm no doctor. Mine gets up to 150-160bpm in the shower which is what caused me to worry.. and then the worry raises it even higher.
I'd like to hear any other reasons though. This just seems to be the only one I can find. Maybe the only explanation.
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∙ 14y ago
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