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.
is that the the winter swimmers were physically uh warmer on the skin compared to the control group so they when they are out of the cold when they're out of the cold just relaxing and we tested this in in on the days where they were sleeping in the lab so we could see that they had a a more activation of the brown fat higher temperature so probably because they also loose heat uh they have higher heat loss to the body compared to the control group
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we did see that the winter swimmers were shivering less H or uh having less uh vigorous shivering when they said I'm cold so even though they they perception their perception of the cold was pretty similar in in the in the groups we could see that the the activation of the the muscles that measured on um were different and more vigorous in the control group
in terms of fortifying metabolic health we can cultivate brown fat we can activate that brown fat with you know Coldwater immersion