A Sauna Session as Exhausting as Moderate Exercise
A Sauna in Munich
Credit: Jorge Royan / Wikimedia Commons
Contrary to the previous assumption, blood pressure does not drop during a sauna session – it rises. And this increase is even comparable to the increase caused by a short, moderate workout. This is one of the conclusions of a recent study carried out by sports scientists at the Martin Luther University Halle-Wittenberg (MLU) in collaboration with the Medical Center Berlin (MCB). On separate days, the participants were sent to a sauna and placed on a bicycle ergometer. In addition to higher blood pressure levels, an increase in heart rate was measured both during the sauna visit and during exercise. The study was recently published in the international journal “Complementary Therapies in Medicine”.
It is generally assumed that a sauna visit leads to a continuous fall in blood pressure. “It was thought that the heat dilates the blood vessels and that this lowers the blood pressure”, says Dr Sascha Ketelhut, lead author of the new study and a sports scientist at MLU. People with low blood pressure or cardiovascular disorders have traditionally been advised not to use saunas, as a further fall in blood pressure can lead to fainting. “However, it is important to distinguish between the acute effects of a sauna session and the effects that were noted during the rest period after the sauna session. Many previous assumptions have been made about the acute effects of sauna use, but so far little research has been done”, continues Ketelhut.
The scientists conducted their study by recruiting 19 volunteers to measure the immediate effects of sauna use on the cardiovascular system: The participants were exposed to a 25-minute sauna session, while having their blood pressure and heart rate measured. Both rose immediately during the sauna visit. After the sauna session, both blood pressure and heart rate began to drop below participant’s baseline levels that were measured before the sauna session.
In the second part of the study the participants completed a short exercise program on an exercise bike while also having their blood pressure and heart rate assessed. “Comparing the two conditions, the participants’ blood pressure and heart rate reached the same levels during the sauna session as they did with a load of about 100 watts during the exercise test”, says Ketelhut. This shows that a sauna session is kind of a burden on the body.
The observations made by the researchers are supported by previous studies that focused primarily on the long-term effects of sauna use, demonstrating positive effects on the cardiovascular system, for example. “A sauna session is a physical strain. Its long-term positive effects are similar to sports activities”, explains Ketelhut. Nevertheless, the healthy sweating does not contribute to weight loss: “The effect is too low as there is no muscle activity. Although we lose weight in the sauna, but these are just the fluids that we sweat out. One should rehydrate after a sauna session, though”, concludes Ketelhut.
Contacts and sources:
Martin-Luther-Universität Halle-Wittenberg
Citation: The blood pressure and heart rate during sauna bath correspond to cardiac responses during submaximal dynamic exercise. Ketelhut S., Ketelhut R. G. Complementary Therapies in Medicine (2019). doi: 10.1016/j.ctim.2019.05.002
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People of sauna culture live longer, what a surprise. Turkish, Finns and Mongols all have different Sauna culture, from mutual origin. Only Finns live longer compared to other industrionalized countrys. If they eat fish… And are not moslims.