The conventional wisdom is to drink regularly even when not thirsty. Two recent studies (U of Cape Town study on cyclists; Sports Science Institute of South Africa study on runners) appear to dispute that viewpoint.
These two studies show that performance was no better when the athletes drink at a rate sufficient to completely prevent sweat-induced weigh loss than when they drank according to their thirst.
My POV: These subjects are trained athletes who understand their bodies. So they are likely to be more cognizant of the need to drink. Recreational runners may be better off to drink regularly in small amounts, and to stop when the stomach is swishing with liquid!
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