Wearable data from 59,000 days shows saunas drop nighttime heart rates 3 bpm more than exercise alone, even after activity controls. Women see strongest effects in luteal phase.…
By Will Stone Sauna enthusiast Michael Calcagno, second from right, sits inside a clear-walled wood-fired sauna during the Seattle Sauna Festival in November.
What seemed like a wellness gimmick turned out to have real science behind it, with research linking frequent sauna use to lower dementia risk and better recovery.