Our expert says:
It's true that swimming is less effective than say running or cycling. It's not for that reason though - the temperature is irrelevant. The main reason swimming is less effective is that you aren't weight bearing, and so the energy use during the say 30 minutes is lower. You can play around with the burn-o-meter on the diet page and see what I mean.
So to answer your question, cooling after exercise does nothing to weight loss. That increased energy use they talk about after exercise is finished is not about temperature, it's about restoring the body to its pre-exercise state, and so it doesn't matter whether you're cooler or not.
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