Finally. A major sauna report that does not come from a Finnish university and happen to be sponsored by Harvia.
For many years, sauna research has almost become a Nordic phenomenon of its own, often with the same geographic origin, the same cultural bias and sometimes the same commercial ties. That is why it is interesting to see a comprehensive new review in Comprehensive Physiology now summarising several decades of research on heat therapy in a considerably broader way. And the conclusion? It is becoming hard to dismiss sauna as "just pleasant".
The researchers reviewed the evidence for different forms of heat therapy, from traditional sauna to hot baths, and found growing support for positive effects on:
- cardiovascular health
- metabolic health
- brain function
- depression and mental wellbeing
The authors themselves write that the state of the research today in many ways resembles the early years of the "exercise as medicine" concept. That is quite a statement.
Earlier studies have already shown that regular sauna use is associated with a lower risk of dementia, cardiovascular disease and overall mortality. What is new here is that heat therapy is starting to be seen as something potentially more systematic: not just relaxation, but a biological stressor that appears able to trigger positive adaptations in the body.
This does not mean that sauna is a miracle treatment. And just as with exercise, dose, frequency and the individual are likely decisive. But the direction of the research is becoming ever clearer.
At Executive Health we are generally cautious about health trends and longevity hype. But certain interventions have something that many biohacking trends lack: a long track record, low cost, relatively low risk, and a rapidly growing body of serious research behind them. Sauna increasingly looks like one of those interventions.
Source: "Heat Therapy: Mechanisms and Clinical Applications", Comprehensive Physiology, 2026.
