Sauna’s potential health benefits draw scientists’ interest : NPR

Key Points:

• Scientists have long studied the human body's response to extreme heat, noting physiological mechanisms like blood vessel dilation and heat shock protein activation that protect cells during heat exposure.
• Despite well-understood heat physiology, the potential therapeutic benefits of heat exposure, such as sauna use, have been understudied in rigorous clinical trials, though public interest in heat therapy is rapidly growing.
• In September, a group of about 15 scientists met at the International Heat Therapy Research Symposium in Norway to establish standardized research protocols and form a scientific body to advance heat therapy studies.
• Early evidence suggests passive heat therapy may improve cardiovascular health, metabolic markers, and mental health, with some studies indicating benefits similar to light exercise, especially for people with cardiovascular or metabolic conditions.
• Much of the recent scientific interest stems from Finnish observational studies linking frequent sauna use to reduced risks of cardiovascular disease, Alzheimer's, and inflammation, but experts emphasize the need for large, well-controlled trials to confirm these findings.