Researchers are suggesting that "heat training" via regular sauna use may help the human body adapt to the increasingly frequent heatwaves caused by climate change. Professor Jari Laukkanen, a cardiologist at the University of Eastern Finland, notes that repeated exposure to high temperatures can trigger physiological acclimation.
The UK's 800-sauna surge amid record heat
The United Kingdom is currently grappling with the realities of a warming climate, having recently endured one of its hottest summers on record. With temperatures exceeding 30 degrees Celsius for more than 30 days, the UK Health Security Agency has released several heat health warnings.
In response to these shifting weather patterns, sauna bathing has seen a significant rise in popularity across the country. According to the report, there are now over 800 dedicated saunas operating nationwide, as enthusiasts look for ways to manage the rising mercury. This trend reflects a broader movement toward using traditional Scandinavian practices to navigate modern environmental challenges.
Physiological shifts from 70 to 100 degree Celsius sessions
The core of this "heat training" involves exposing the body to intense temperatures, typically between 70 and 100 degrees Celsius, for durations of 10 to 15 minutes. This is often followed by a period of cooling in ice-cold water.
Professor Laukkanen explains that this specific process enhances the body's thermoregulatory responses. the research indicates that regular users may experience several physiological adaptations, including :
- Improved skin blood flow and more effective sweating
- Increased plasma volume to assist with hydration
- Reduced cardiovascular strain during subsequent heat exposure
The report states that these changes help people tolerate hot environments more efficiently and may even help them become more attuned to the early signs of heat exhaustion.
Professor Laukkanen's 40-to-60 minute daily protocol
Achieving these benefits is not an immediate process and requires a structured approach to avoid health risks.. Professor Laukkanen recommends a gradual training period to achieve short-term acclimation, which typically lasts about one week.
The suggested protocol involves approximately 40 to 60 minutes of total heat exposure per day, spread over four to six days. The report emphasizes that shorter sessions followed by proper rehydration and cooling are likely the most sensible way to build this tolerance. However, the benefits are not permanent; longer-term physiological changes require more extended periods of training.
The lack of medical guidance for using saunas during heatwaves
Despite the potential for acclimation, several critical questions remain regarding the safety of this practice during extreme weather events. The source explicitly states that there is currently no medical guidancce on the use of saunas during an active heatwave, leaving a gray area for those attempting to use them as a reactive measure.
It remains unclear how much "heat training" might actually exacerbate the risk of heat exhaustion if performed when ambient temperatures are already at record highs. Additionally, the report does not provide specific safety thresholds for beginners, noting only that they shuold exercise caution. for now, experts suggest that sauna use should only complement, not replace, standard public health advice such as seeking shade and staying hydrated.
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