Thanks for your input! There is so much to learn! Heat was NOT an issue on this ride. The first half was in a cold rain, the second half was drying and thawing out in the weak but warm sunshine. I'm sure it was the Gatorade. This was the first time I've really drank the stuff. I tried to go 50/50 with water but it was still to much. I ate some, mostly protien bars, but we were so long on the ride I do think my empty stomach was part of the problem too. SadieKate, where do I find the E-caps? They sound like they are worth a try.