The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
And it's interesting that they noted that in all cases, but especially at that coldest temperature, there was an increase in cortisol, but that it was transient, That eventually people's cortisol, the stress hormone subsided a bit.
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Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
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they observed no significant increases in the stress hormone cortisol and that is both surprising, interesting, and important because what it means is that the quality of stress that deliberate cold
in many other papers that you can increase levels of autonomic arousal by having people put their arm into ice water for 1 to three minutes the so-called cold pressure test it's a very commonly used standard test
If you want to use deliberate cold exposure as a way to increase cortisol, great, do that. But probably don't do it more than say one or two times per week. Otherwise, it will lose its effectiveness for that purpose.
However, if they do this habitually, then the increases in cortisol are not meaningful. They're not statistically significant.
nor will you get much of a cortisol increase from deliberate cold exposure like ice baths and cold showers. If you do it two times a week or more.