We can't find evidence that holds up here. Proponents are reasoning from mechanism or analogy rather than direct human data, and the most credible skeptics raise objections we can't dismiss.
It can actually shock your heart. It can actually give you a heart attack if it's truly, truly ice cold, and you're not adapted to that. So proceed with caution, please. I'm not a physician and I don't want to see anyone get hurt.
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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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Now, I wouldn't want anyone to take this to mean that they should just jump into an unknown body of water. There are all sorts of factors like currents, and if it's very, very cold, yes, indeed. You can stop the heart.
if it's very, very cold, yes, indeed. You can stop the heart. People can have heart attacks from getting into extremely cold water, like a melted mountain stream that's been frozen all winter, or has been very, very cold or as a snow pack going into it.
If you are trained to do that and you have the right conditions, et cetera, that can be done reasonably safely, but that's certainly not what I would start with. And for many people, that would be too cold and indeed some people can go into cold shock and can die as a consequence of getting to that extremely cold water very quickly.
Look, if you get into water that's very, very cold, it can actually shock your heart. It can actually give you a heart attack if it's truly, truly ice cold and you're not adapted to that.