Scientists are investigating whether repeated use of saunas could help individuals cope better with heatwaves. A growing number of studies are considering if 'heat training' can prepare people for scorching temperatures, even as some venues promote saunas as a way to manage the heat.
Professor Jari Laukkanen, a cardiologist at the University of Eastern Finland, suggests that gradual exposure to heat can improve the body's ability to cope. He noted that physiological adaptations, such as more efficient sweating and improved skin blood flow, can occur with passive heat exposure like sauna bathing.
Dr Jessica Mee of the University of Worcester added that regular heat exposure can also change how hot people feel and their behaviour, leading to more sensible pacing and consistent hydration. However, experts stress that heat adaptation is a preparation strategy and not an immediate solution for the hottest days, with limited evidence that saunas protect people from heat-related illness during a heatwave itself.
Safety concerns exist for individuals with acute illness, fever, unstable angina, recent heart attack, or uncontrolled low blood pressure, who should seek medical assessment before such exposure. Studies on heat training are typically conducted in supervised settings, and it is not yet known how safely or effectively this transfers to unsupervised home use.