27 Sep '13, 6pm

Thirst v. Dehydration: The Continuing Saga

So, to cut a long story short, that's why I find the current study so interesting. In fact, I wish they hadn't bothered to include the strong wind, because now it's not possible to know for sure how much each factor contributed to the outcome. But this study does an excellent job of eliminating the mental effects associated with thirst -- the conscious knowledge of drinking or not drinking, and the subconscious cues associated with water in the mouth and flowing down the throat (which previous studies have shown can influence levels of the crucial hydration hormone arginine vasopressin). Instead, the variable is simply how much fluid there is in the body -- and with this particular set of parameters, that doesn't seem to affect endurance performance.

Full article: http://www.runnersworld.com/drinks-hydration/thirst-v-deh...

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