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quick google
https://outdoorswimmer.com/guides/cold-water-science-and-nutrition
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Scientists took 11 male subjects and had them perform 45 minutes of exercise on a cycle ergometer machine, all the time submerged under water where the temperature was set at either 33 degrees Celsius or 20 degrees. Following 45 minutes of exercise test subjects were then given free access to a standard assortment of food where the caloric value of each food was known. Energy consumption was measured and the results revealed subjects in the cold temperature test consumed 41 per cent more calories than the neutral, control group.
"Hmm, not sure about that. It just means that the colder group gobbled more food, who knows if they actually expended 41% more energy during the exercise.
But a typical pool is 26-28 deg C, not 20 deg C.
Hmm, more #magnets required I think.
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Greenbank
Yeah, but you're gliding through it. Wait, this is a different thing. We want to know if more calories are lost due to thermal conductivity of water, not just the activity.