Bryan Johnson· Author
I measured this because I got intense muscle cramps during sleep after starting sauna and needed to figure out the electrolyte balancing.
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
I measured this because I got intense muscle cramps during sleep after starting sauna and needed to figure out the electrolyte balancing.
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First few days I felt a bit fatigued and my sleep was disrupted.
I I really don't complain much about anything. I just kind of endure it and I maybe maybe I should uh speak up. I guess like um I didn't think this was a side effect that was necessarily worth reporting to you, I thought it was just part of the adaptation period. And so, but otherwise, you know, when when I do experience something that I think is a potential side effect that would that would change how you process information, I do try to report that back.
4–7 sauna sessions per week, 20 minutes at 80°C+, reduce cardiovascular mortality risk by 40% over a decade.
Regular sauna use raises BDNF and improves verbal memory in older adults.
Sauna protocols only generate the longevity effect when sessions exceed 30 minutes.
Hot-tub bathing yields cardiovascular benefits comparable to traditional Finnish sauna at matched core-temp dose.