“Heat therapy (e.g., sauna, warm baths) is known to reduce stress hormones like cortisol. Cold exposure (e.g., cold showers) ...

This natural defence mechanism helps protect sperm and testes ... The combination of erectile dysfunction and winter-induced vasoconstriction can create a compound effect on sexual function.

Using a new plethysmographic technique to measure peripheral arterial tone (PAT), we report here that REM sleep in humans is associated with considerable peripheral vasoconstriction. The apparatus ...

Ways in which the body can increase temperature are: Vasoconstriction - blood vessels ... Negative feedback control is the mechanism used to control the temperature of the body.