Introduction
Sauna bathing raises cardiovascular workload, which can be useful context for healthy users and a safety consideration for higher-risk users.
Study Snapshot
★★★★☆ Systematic Review- Journal
- Mayo Clinic Proceedings
- Publication Year
- 2018
- Study Type
- Narrative review
- Evidence Level
- Systematic Review
- Participants
- Not reported
- Population
- Adults in sauna and passive heat research
- DOI
- 10.1016/j.mayocp.2018.04.008
- PubMed
- 30077204
Research Summary
Sauna research supports a plausible cardiovascular stimulus. The safest consumer framing is conditional: heat exposure may support wellness routines for appropriate users, but individual risk matters.
Studies Reviewed: What the Researchers Found
Cardiovascular and other health benefits of sauna bathing: a review of the evidence
★★★★☆ Systematic ReviewLaukkanen JA, Laukkanen T, Kunutsor SK · Mayo Clinic Proceedings · 2018
A review summarizing cardiovascular, vascular, and broader health evidence related to sauna bathing.
- Sauna bathing produces heat stress that increases heart rate and circulation demand.
- Evidence suggests possible cardiovascular and vascular benefits, especially in observational data.
- The review emphasizes safety considerations and the need for appropriate individual context.
Association between sauna bathing and fatal cardiovascular and all-cause mortality events
★★★☆☆ Cohort StudyLaukkanen T, Khan H, Zaccardi F, Laukkanen JA · JAMA Internal Medicine · 2015
A long-term cohort study associating sauna frequency with cardiovascular and all-cause mortality outcomes.
- More frequent sauna bathing was associated with lower risk of several fatal cardiovascular outcomes in this cohort.
- Longer sauna duration was also associated with lower risk in some analyses.
- The study is observational and cannot prove sauna use caused the outcomes.
Strength of the Evidence
Evidence strength depends on study design, sample size, population fit, and whether outcomes are direct human outcomes or early mechanistic signals.
Study Limitations
- Many health outcome data are observational.
- Finnish sauna protocols may not match all home sauna formats.
- Device type, temperature, and session duration vary.
- Observational design leaves residual confounding possible.
- Population was Finnish men, limiting generalizability.
- Sauna habits may correlate with broader lifestyle patterns.
What This Means for Consumers
Choose sauna features that make safe, repeatable sessions easier: temperature control, ventilation, space, and comfort.
References
- Laukkanen JA, Laukkanen T, Kunutsor SK. Cardiovascular and other health benefits of sauna bathing: a review of the evidence. Mayo Clinic Proceedings. 2018. DOI: 10.1016/j.mayocp.2018.04.008. PubMed/source
- Laukkanen T, Khan H, Zaccardi F, Laukkanen JA. Association between sauna bathing and fatal cardiovascular and all-cause mortality events. JAMA Internal Medicine. 2015. DOI: 10.1001/jamainternmed.2014.8187. PubMed/source
Frequently Asked Questions
Why does sauna affect heart rate?
Heat exposure shifts blood flow toward cooling the body and can raise heart rate, making sauna sessions a meaningful physiological stressor.
Who should be cautious with sauna use?
People with cardiovascular concerns, heat intolerance, pregnancy, or relevant medical conditions should consult a qualified health professional before intense heat exposure.