Our expert says:
Probably a fallacy, athough it depends on circumstances. If you jump into very cold water after sitting lolling in a hot son, it is likely to be a nasty shock to one's system, including heart and blood pressure, and not a good idea. Splashing some of the cold water on your chest before hand might slightly decrease the degree of shock, but better might be to make the transition more gradual ( wich is after all the idea behind the splashing ) and, as well as splashing, to get in gradually, maybe sitting for a while with one legs in the pool ( or walking in the water at a beach ) to let one's body get more used to the change in store for it, and getting into the water gradually.
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