alt Hacker NewsRight, the rationale for why saunas and heat stress is good for you is specifically because it raises the heart rate.
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hbcdbff • today at 4:10 PM
Sauna raises HR without increasing blood pressure though (modulo some possible initial short spike at the beginning), because your blood vessels dilate.
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Hot sauna is often cautioned against for those with existing cardiac or vascular problems, with some reason.