March 9th is Helsinki Sauna Day, and in recognition of this day our post will review research related to Finnish sauna bathing and cardiovascular events. This will be our first of three posts on the benefits of sauna bathing.
The sauna is an important part of Finnish culture. One of the first recorded writings on sauna baths are from the monk Nestor the Chronicler in 1112. Some versions of the Finnish sauna are thought to go back at least two thousand years. There is an average of one sauna per household in FInland, where saunas are a place to relax with family and friends. A traditional Finnish sauna usually has warm (80-100 C), dry (10-20% humidity) air.
A recent study looked at the association of the frequency as well as duration of sauna bathing and several cardiovascular markers, such as sudden cardiovascular death and fatal cardiovascular diseases. A prospective cohort study was performed by enrolling over 2300 men, ages 42-60 years, from eastern Finland. Subjects were from the Finnish Kuopio Ischemic Heart Disease Risk Factor Study.
The subjects were subdivided into groups based on the frequency of sauna bathing (1, 2-3, and 4-7 times each week) and also the duration of the sauna sessions (<11, 11-19, and >19 minutes per session). Baseline evaluations were conducted beginning in 1984 through 1989. On average, participants were followed for 18.8 years.
Results of the study demonstrated that the subjects with a higher frequency of sauna bathing per week had a lower risk of both fatal coronary heart disease and fatal cardiovascular disease. In fact, the risk of fatal coronary heart disease was 23% lower for 2-3 sauna sessions per week, and 48% lower for 4-7 sauna bathing sessions per week.
In addition, the frequency of sauna bathing was also inversely associated with all-cause mortality, with a 40% reduction in all-cause mortality when comparing 4-7 sessions per week of sauna bathing to one session per week.
The mechanism by which sauna bathing confers these protective cardiovascular benefits is not entirely clear. Heart rate may rise to 100-150 beats per minute during a sauna bath, which is comparable to some types of low and moderate exercise training. It is also believed that sauna bathing is beneficial for the endothelial lining of the blood vessels.
It would be helpful to perform this same study in a population of female participants, to see if the results would be comparable.
While sauna bathing may not be for everyone, again we have a simple low risk intervention that may yield great benefits. Happy Helsinki Sauna Day!
“The ideal sauna is a small building made of logs, set near a lakeshore, facing towards the sunset.” Bernhard Hillila
(Source- JAMA Internal Medicine 2015: 175(4):542-548)
This bog is a review of published medical and scientific literature, and should only be used for informational purposes. It does not constitute medical or health advice, nor does it create a physician-patient relationship with anyone. Discuss any health concerns with your personal physician.