Rhonda Patrick· PhD
A 45-minute hot bath (105°F) can lower blood pressure by up to 14 mmHg and increase cardiac output and heart rate, mimicking low- to moderate-intensity aerobic exercise.
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
A 45-minute hot bath (105°F) can lower blood pressure by up to 14 mmHg and increase cardiac output and heart rate, mimicking low- to moderate-intensity aerobic exercise.
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improved blood pressure by 14 mmHg • increased cardiac output by 3.7 L/min • increased heart rate by 39 bpm
I already mentioned that hot baths do improve blood pressure. countless studies on that.