Sweating cools the body but also causes dehydration. Sweat that evaporates from the skin is more effective at cooling than sweat that drips off the body.
Drinking while you exercise does not replace all of the water lost in sweat quickly enough. Be sure to increase your fluid intake before you exercise and continue to drink after you finish exercising in hot weather. It is easy to become dehydrated during exercise, which increases the risk for a heat-related illness.
You can help prevent dehydration and a heat-related illness. Drink plenty of water before, during, and after you are active. This is very important when it's hot out and when you do intense exercise.
Do not use salt tablets, which are absorbed slowly and can cause irritation of the stomach. Salt tablets do not replace water loss.
Last Revised: September 1, 2011
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