Being an avid sauna fan for some years and use it 2-4 times weekly i have been reading up on some of the science Rhonda Patrick has a good report, i do however have some issues with it. In the report on page 7 it is stated that 2 one hour sessions at 80°c (176F) increases growth hormone by 16%
I do 20 minutes sessions at 85°c (185F) once and a cooldown then perhaps add 10 minutes after a 10-20 minute break. The final minutes of the 20 min session are hard i have pushed to 25 minutes but then my heart starts racing and i feel like my body cannot compensate for the heat any longer, weighing myself has shown that a full session 20 min sauna 10-15 rest and 10 minutes again leaves me 2.kg lighter which is water lost through sweat as i do not hydrate while in the sauna or resting, do that afterwards.
Either the 60 minute session experiment was done in a time were ethics in science were different or its BS, atleast the mortality rate for the experiment is not shown.