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Cold water immersion... one hour at 57 degrees Fahrenheit increases norepinephrine by 500% and dopamine by 250%. 40 degrees Fahrenheit cold water immersion for about 20 seconds... increases norepinephrine 200-
300%.
Ben Greenfield
Cold Exposure Improves Brain Health By Increasing Norepinephrine
Fire & Ice: Tips, Tricks & Biohacks To Maximize The Benefits Of Sauna, Hyperthermia, Cryotherapy & Cold Thermogenesis.
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