It could also lower your risk of heart disease and stroke, a new study finds.
They discovered this after tracking the bathing habits and cardiovascular disease risk of more than 61,000 Japanese adults for 20 years.
Bathing linked to heart health
Participants ages 40 to 59 with no history of heart disease were followed from 1990 to 2009. At the start of the study, they were separated into groups by how often they took a bath in a tub on average: less than once a week, one to two times per week, almost daily or every day.
The researchers also gathered information on potentially influential factors, such as the participants’ weight, smoking status, how often they exercised, alcohol intake, job status, education, how long they slept, perceived mental stress and life enjoyment.
By the end of the follow-up period in 2009, out of more than 30,000 final participants, the researchers documented 2,097 cases of cardiovascular disease, including 275 heart attacks, 53 sudden cardiac deaths and 1,769 strokes. They found that the more the participants bathed, the lower their risk was for cardiovascular disease.
The temperature of the water, based on participants’ descriptions, also mattered. There was a 26% lower risk for heart disease with warm water, and a 35% lower risk of cardiovascular disease for hot water.
Why bathing could help the heart
Tub bathing is considered to have a preventative effect against heart disease by improving what’s called “hemodynamic function,” the report said. This describes the way that blood is able to be pumped efficiently through the body, said Dr. Eric Brandt, a cardiologist and lipidologist at the Yale School of Medicine’s Yale New Haven Hospital, who wasn’t involved in the study.
Good hemodynamic function would mean that the heart is able to efficiently pump blood without having to fight against conditions such as high blood pressure.
“Good hemodynamic function translates to a low blood pressure or normal blood pressure states, where the heart is able to pump efficiently and get blood to all the organs,” Brandt said. “Bad hemodynamics are either extreme high or low blood pressure states where the heart has to work harder, essentially.
“It seems like tub bathing is similar to exercise in that it increases the heart’s work, [but] it does so by relaxing the blood vessels and getting blood pumping to other parts of the body. So it creates this extra temporary work for the heart, but not one that’s a negative consequence.”
Sudden death associated with hot baths is common in Japan, where the study was conducted, but frequency of bathing wasn’t associated with a higher risk of sudden death in this study.
Other factors for consideration
While the study suggests that daily baths could help lower your risk for heart disease, that isn’t the only factor to consider.
Brandt isn’t convinced that bathing alone is the main reason for the study’s findings of lower heart disease risk; it’s more likely, he said, that regularly taking a warm or hot bath “can have a temporary physiological change that’s similar to exercise,” and that other healthy lifestyle factors came into play.
“Our population is so different than the Japanese, and lifestyle especially,” Brandt said. “The risk might be different for Americans compared to Japanese in the context where we carry a heavier burden of chronic lifestyle-related illnesses. I would say that among patients where this could apply is that among people up to their 70s, with tub bathing at least there wasn’t a signal in the study of cardiovascular harm.”
While there’s only a link between bathing and a lower risk of heart disease, bathing likely doesn’t lead to any kind of cardiovascular harm if done safely, Brandt said.