One of the questions I have been meaning to answer for myself is to know my sweat rate so I can better calculate fluid and electrolyte replacement. Water loss has been a big problem for me.
Yesterday I ran about 9 miles and I lost over 5 pounds of weight. That's over 2.25 liters of water, which seems like a lot considering it wasn't a particularly hot or humid day.
Along with the water, I also lost sodium, potassium, and chloride, though that is harder to calculate.
No surprise then that my medical incidents on hot/humid runs have usually resulted in 3+ liters of intravenous saline.
A couple of links about sweat rates and sweat composition:
http://www.gssiweb.com/Article_Detail.aspx?articleid=65
http://jp.physoc.org/cgi/reprint/155/3/490.pdf
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