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Why do we sweat after running? Also we sweat sometime after drinking lots of water. Why it is so? Can someone please enlighten me in this regard?

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Exercise, such as running, increases muscle activity. This increases the energy demand of these tissues, which increases the rate of cellular respiration. Respiration releases heat as a by-product, therefore the body is hotter during and after exercise.

Sweating is a homoeostatic mechanism to keep core body temperature constant. It is a response to lower the body temperature. When the body becomes too hot, sweat is released onto the surface of the skin. The water from the sweat then takes some of the excess heat energy from the body and uses it to evaporate. Because water has a relatively large specific heat capacity a lot of heat can be carried away by this method.

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But I sweat even after I lots of drinking water.... what could be the reason here? –  gpuguy Jul 9 '12 at 14:01
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@gpuguy Do you mean you sweat after exercise even if you drink water? Or do you mean that at rest, in a cool room when one wouldn't usually sweat, you drink a lot of water and then begin to sweat? –  Ben Jul 10 '12 at 17:28
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i meant: "that at rest, in a cool room when one wouldn't usually sweat, you drink a lot of water and then begin to sweat?" (especially some time after having dinner/lunch) –  gpuguy Jul 10 '12 at 17:37
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