In my group Saturday, we had a conversation about staying hydrated on the river. I mentioned studies that have been done about the impact of dehydration on performance. Though I got the statistics screwed up --- typical me :-) --- the point was valid. Even a small degree of dehydration impairs both physical and mental performance.
While there is lots of research to be found, this article (http://healthfitness.com.au/articles/highperformancetraining/dehydration_performance.html) has an interesting table showing degrees of dehydration and expected impact. (I do disagree with one point. This table lists "loss of appetite" as an early symptom. But I often think I'm hungry when I'm actually thirsty due to dehydration.)
I heard lots of comments Saturday about small bladders and drysuits without zippers. :-) But your performance on and your enjoyment of a long day on the water may depend on keeping yourself hydrated.
Drink up! ;-)
JOHN
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