Bryan Johnson· Author
The cited study (Iguchi 2012) actually lands the mean rectal temp at 101.3 ± 0.5°F (38.50 ± 0.27°C) after 30 min at 163°F (73°C), right at the lower edge of the HSP induction window. Individual increases ranged from 1.28°F to 2.16°F (0.71°C to 1.20°C): roughly half the subjects fell below 101.3°F (38.5°C), and essentially none reached 102.2°F (39°C).