When we are swimming lap after lap in our favorite Olympic swimming pool, we are technically exercising in the pool. But doesn’t exercising caused us to sweat? Why ain’t we sweating while we are swimming? Or does the body get cooled enough from the water, so that we don’t have to sweat?
The answer to that is that it is not likely your body would be warm enough to sweat in cool water. If you are in a hot tub then yes, you are. Water conducts heat away from you 25 times better than air does. That is why you would be hot in an 80 degree Fahrenheit room, but in 80-degree water, you would feel cool.
It depends on a few different things such as how hard you’re swimming and the temperature of the water.
Sweating is a result of increased core body temperature. If your body temperature goes much above 99 degrees, you start sweating. An exercise of any kind increases your body temperature. If you are swimming hard and long enough for your body temperature to increase, your body will begin to sweat (outside of a few pathological conditions, like heat stroke). If you are immersed in enough water, it’s possible for the water to soak up enough heat rapidly. This is enough that your body temperature doesn’t rise enough for you to start sweating.
Or, if you want to answer this question yourself, go sit in an extremely hot jacuzzi for 20 minutes and see if you start sweating (Hint: the water pouring down your face after that 20 minutes didn’t magically jump from the jacuzzi to your face. It’s sweat).
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