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Am J Hypertens. 2017 Nov 1;30(11):1120-1125. doi: 10.1093/ajh/hpx102.

Sauna Bathing and Incident Hypertension: A Prospective Cohort Study.

Author information

1
Diabetes Research Centre, University of Leicester, Leicester, UK.
2
Institute of Public Health and Clinical Nutrition, Department of Medicine, University of Eastern Finland, Kuopio, Finland.
3
Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK.
4
Department of Neurology, Medical University Innsbruck, Innsbruck, Austria.
5
School of Clinical Sciences, Musculoskeletal Research Unit, University of Bristol, Learning & Research Building (Level 1), Southmead Hospital, Southmead Road, Bristol, UK.
6
Central Finland Central Hospital, Department of Medicine, Jyväskylä, Finland.

Abstract

BACKGROUND:

Sauna bathing is associated with reduced cardiovascular risk, but the mechanisms underlying this beneficial effect are not entirely understood. We aimed to assess the relationship between sauna bathing and risk of incident hypertension.

METHODS:

Frequency of sauna bathing was ascertained using questionnaires in the Kuopio Ischemic Heart Disease Study, a prospective cohort study conducted in Eastern Finland that comprised a population-based sample of 1,621 men aged 42 to 60 years without hypertension at baseline. The incidence of hypertension was defined as a physician diagnosis of hypertension, systolic blood pressure (SBP) >140 mm Hg, diastolic blood pressure >90 mm Hg, or use of antihypertensive medication.

RESULTS:

During a median follow-up of 24.7 years, 251 incident cases (15.5%) were recorded. In Cox regression analysis adjusted for baseline age, smoking, body mass index, and SBP; compared to participants reporting 1 sauna session per week, the hazard ratio for incident hypertension in participants reporting 2 to 3 sessions and 4 to 7 sessions was 0.76 (95% confidence interval: 0.57-1.02) and 0.54 (0.32-0.91), respectively. The corresponding hazard ratios were similar after further adjustment for glucose, creatinine, alcohol consumption, heart rate, family history of hypertension, socioeconomic status, and cardiorespiratory fitness: 0.83 (95% confidence interval: 0.59-1.18) and 0.53 (0.28-0.98), respectively.

CONCLUSIONS:

Regular sauna bathing is associated with reduced risk of hypertension, which may be a mechanism underlying the decreased cardiovascular risk associated with sauna use. Further epidemiological and experimental studies could help elucidate the effects of sauna bathing on cardiovascular function.

KEYWORDS:

Sauna bathing; blood pressure; cohort; hypertension; prevention

PMID:
28633297
DOI:
10.1093/ajh/hpx102
[Indexed for MEDLINE]

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