Cardiovascular and Other Health Benefits of Sauna Bathing: A Review of the Evidence.
Level 5 - mechanism / opinion, no new human data
Narrative literature review summarizing observational, experimental, and interventional studies.
PubMed 30077204 · doi:10.1016/j.mayocp.2018.04.008
What was done
Authors searched MEDLINE and EMBASE from inception to February 24, 2018, to review observational studies, randomized controlled trials, and non-randomized trials evaluating Finnish sauna bathing. The review assessed associations with cardiovascular outcomes, nonvascular conditions, mortality, and underlying biological mechanisms.
What was found
The abstract reports no numerical data or effect sizes. It qualitatively describes associations between sauna bathing and reduced risks of hypertension, cardiovascular disease, neurocognitive disorders, pulmonary disease, and all-cause mortality, as well as symptom amelioration in arthritis, headache, and flu. Postulated mechanisms include enhanced endothelium-dependent dilatation, reduced arterial stiffness, autonomic nervous system modulation, improved lipid profiles, and reduced systemic blood pressure.
Why it matters
This review compiles the physiological and epidemiological evidence supporting Finnish sauna use as a lifestyle intervention with broad cardiovascular and overall health benefits.
Limits
The abstract does not state the number of studies reviewed, total sample size, or quantitative effect sizes. Observational findings on Finnish sauna habits may reflect residual confounding (e.g., socioeconomic status, general health consciousness) and may not fully generalize to other heating modalities or populations.