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@deleted
I believe, but can't remember the reasoning, that dehydration reduces the ability of your muscles in endurance events, but has no effect on strength. Past a certain point you'll reach a threshold which will begin to affect your performance. I think it has something to do with Phosphate and H+/ Ca2+? K+ levels.
having said that, on proper long runs you should take something that isn't water, but electrolyte, because you can get quite severe hyponatraemia (low sodium) and therefore hypovolemia (low blood volume)?