Home sauna benefits and what to know before you buy

Sauna use triggers a process called "cardiovascular mimicry." In the high heat of a sauna, the heart rate can rise to 120 beats per minute, which is comparable to the physical strain of a brisk walk or light jog. This causes blood vessels to dilate and increases cardiac output, providing the vascular system with a legitimate workout without the joint stress of high-impact exercise. Research indicates that frequent users can see a 47% lower risk of hypertension and a 50% lower risk of fatal cardiovascular events.

Heat shock proteins are molecular chaperones that the body produces when exposed to specific thermal stress, typically around 163 degrees Fahrenheit for thirty minutes. These proteins act as a cellular repair crew, fixing damaged or misfolded proteins within the cells to protect the brain, muscles, and heart. A single sauna session can keep these protein levels elevated for approximately forty-eight hours, providing ongoing cellular protection long after the session ends.

The primary difference lies in how they heat the body. Traditional saunas heat the air to high temperatures between 170 and 190 degrees Fahrenheit, often using rocks and steam to create an intense environment. Infrared saunas operate at lower temperatures, typically between 110 and 140 degrees, and use light wavelengths to heat the body directly rather than the air. While traditional saunas offer a high-intensity experience, infrared saunas are often preferred by those who are heat-sensitive or seeking relief for chronic pain.

Because saunas put a significant load on the heart, they are not suitable for everyone. Individuals who have unstable angina or have suffered a heart attack within the last three to four weeks should avoid them. Additionally, those on blood pressure medications—specifically diuretics or vasodilators—risk fainting due to the heat's ability to drop blood pressure further. Pregnant women, particularly in the first trimester, and individuals consuming alcohol should also avoid sauna use due to risks of developmental issues and impaired temperature regulation.

Beginners should focus on hydration and gradual adaptation rather than intensity. It is recommended to drink sixteen ounces of water before entering and to start with shorter sessions of ten to fifteen minutes, two or three times a week. Over time, users can aim for the "sweet spot" identified in research: a total of sixty minutes of heat exposure per week, which can be broken down into three twenty-minute or four fifteen-minute sessions. Consistency is more important than high intensity when starting out.