Sauna heat induces a simulated exercise effect within the body. As the body temperature increases, blood vessels are dilated, blood pressure decreases, and circulation is improved. Though the body is relaxed, the body’s increased core temperature causes the heart rate to increase-one of the body’s methods for cooling down. Research shows that the body’s heart rate can increase from 50 to 80 beats per minute when using a sauna. With continual sauna use, cardiac output can increase over time.

The health benefits of saunas may help treat arteriolosclerosis, a condition where smaller arteries become hard and thick. During sauna use, blood vessels dilate. After sauna use, blood vessels constrict. With continual sauna use, people who suffer from arteriolosclerosis may experience benefits. If you have a condition that affects your arteries or heart, consult your physician before using a sauna. While research shows that “healthy” people benefit from sauna use, people with cardiovascular conditions may experience adverse effects.