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@eone
"Conclusion When well-trained cyclists performed a 25 km cycling time trial under ecologically valid conditions and were blinded to their hydration status, performance, physiological and perceptual variables were not different between trials. These data do not support the residing basis behind many of the current hydration guidelines."
Wall BA, Watson G, Peiffer JJ, Abbiss CR, Siegel R & Laursen PB (2013) Current hydration guidelines are erroneous: dehydration does not impair exercise performance in the heat. Br J Sports Med doi:10.1136/bjsports-2013-092417
Doesn't mention how they felt the day after.