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Hot sauna is often cautioned against for those with existing cardiac or vascular problems, with some reason.
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Exercising or stressing damaged or degenerated tissues = bad
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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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Cannabis causes dilation of blood vessels and elevated HR, it’s the same effect. If you take a big dab you can definitely feel your blood pressure drop and muscles relax even though your heart rate has increased.
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