Re:The brain can recall and reawaken past immune responses
by thevagrant on Tuesday November 09, 2021 @01:54AM
(#29158560)
That's in response to cold. He has also been tested for effects on immune response:
"It was shown that this individual was able to voluntarily activate the sympathetic nervous system through a self-developed method involving meditation, exposure to cold, and breathing techniques. This resulted in increased catecholamine and cortisol release and a remarkably mild innate immune response during experimental endotoxemia compared with more than 100 subjects who previously underwent experimental endotoxemia."
"It was shown that this individual was able to voluntarily activate the sympathetic nervous system through a self-developed method involving meditation, exposure to cold, and breathing techniques. This resulted in increased catecholamine and cortisol release and a remarkably mild innate immune response during experimental endotoxemia compared with more than 100 subjects who previously underwent experimental endotoxemia."
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4034215/
Perhaps it is bunk science? I'm not qualified to say. I personally did find the methods have been helpful.