If you want true expert advice about hydration, you should go to the ultra marathon cycling website, http://www.ultracycling.com/ and look under the nutrition section for several articles by Lulu Weschler. You will find all the latest research on this subject- several important studies have been recently released, as well as instructions on how to do a sweat test, so there will be no more guessing about how much sweat/urine you need to replace- you will have an exact quantity, and then there is a pretty set amount of electrolyes per liter of water- 1000 mg.
So, UMCA website, nutrition section, find the article on Drinking Too Much, read that, then link to Pass The Salt, Water And Salt Intake During Exercise, and Electrolytes And Fluid Replacement: Any Debate, the last one by Kevin Setnes and Karl King.
Hope that helps!
Nanci



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