There is an oft-cited ongoing study of more than 2,300 middle-aged men from eastern Finland who were tracked for an average of 20 years (called the Kuopio Ischemic Heart Disease Risk Factor Study). Researchers found reduced risk of sudden cardiac death, fatal coronary heart disease, fatal cardiovascular disease (CVD), and all-cause mortality in sauna users. Interestingly, the risk reduction was also dose-dependent. For example, for men who reported using the sauna 4-7 times per week, the risk of fatal coronary heart disease was significantly lower when compared to men who used the sauna once weekly. And perhaps most importantly, the risk of all-cause mortality was 40% lower among frequent sauna users.
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