Regular tub bathing may reduce the risk of death from cardiovascular disease

Regular tub bathing is linked to a lower risk of death from heart disease and stroke, indicated in a long-term study published online in the journal Heart.  And the higher the ‘dose,’ the better it seems to be for cardiovascular health, with a daily hot bath seemingly more protective than a once or twice weekly one, the findings indicate.

Having a bath is associated with good sleep quality and better self-rated health, but it’s not clear what its long term impact might be on cardiovascular disease risk, including heart attack, sudden cardiac death, and stroke. To explore this further, a group of Japanese researchers drew on participants in The Japan Public Health Center based Study Cohort 1, a population-based tracking study of more than 61,000 middle aged adults (45 to 59 years).

At the start of the study in 1990, some 43,000 participants completed a detailed questionnaire on their bathing habits and potentially influential factors: lifestyle, to include exercise, diet, alcohol intake, weight (BMI); average sleep duration; and medical history and current medicines use.

Each participant was monitored until death or completion of the study at the end of December 2009, whichever came first, with the final analysis based on 30,076 people.

During the monitoring period, 2097 cases of cardiovascular disease occurred: 275 heart attacks; 53 sudden cardiac deaths; and 1769 strokes.

After taking account of potentially influential factors, analysis of the data showed that compared with a once or twice weekly bath or no bath at all, a daily hot bath was associated with a 28% lower overall risk of cardiovascular disease, and a 26% lower overall risk of stroke.  In addition, the frequency of tub bathing wasn’t associated with a heightened risk of sudden cardiac death, or with a particular type of stroke, called subarachnoid hemorrhage (bleed into the space surrounding the brain).

Further analysis of preferred water temperature indicated 26% lower and 35% lower risks of overall cardiovascular disease for warm and hot water, respectively. But no significant associations emerged for overall stroke risk and water temperature.

After excluding those participants who developed cardiovascular disease within 5 or 10 years of the start of the study, the associations found weren’t quite as strong, but nevertheless still remained statistically significant.

In addition, researchers found that frequent tub bathing was significantly associated with a lower risk of hypertension, suggesting that a beneficial effect of tub bathing on risk of cardiovascular disease may in part be due to a reduced risk of developing hypertension.

Take a soak, and thanks for reading.

Journal Reference: Andrew Felix Burden. Tub bathing and heart disease. Heart, 2020; heartjnl-2019-316187 DOI: 10.1136/heartjnl-2019-316187