Machka, I guess the fact that I am in nowhere near the shape you are (from your website) goes without saying which may be a factor. Then again, living in the US Southeastern area, I walk out of my house and begin to sweat profusely as the heat index is usually over 100 in the summer (90F+ and 75-85% humidity on a regular basis). Put me on a bike with even moderate exertion and my skin is wetter than a turned on water faucet in the bathroom. Then again, I sweated like this when I was a kid here, some 50 years ago.

I've never heard of Halfsalt or some of the other products/chemicals mentioned to make my own mix. Seems like they wind up trying to duplicate the Gatorade mix --- just like CocaCola tries to do with Powerade. Shrug. In this case, I'm happy with the Gatorade, even liking multiple flavors but I don't drink it like water. I drink 2 bottles/1 liter of it on a 5-7 hour ride day. Like the Florida Gator and the NFL's Kansas City Chiefs football players in a few blind studies, I find it does help me with long-term exertion in the heat so long as I keep myself hydrated as well.

Those were interesting links you posted concerning Gatorade/electrolytes. I'd be really interested in finding similar info concerning Powerade, Gatorade's main competition. Definitely food for thought. I wish I had links to post in return. All I have is my personal experience with it - and that has to fit in with my allergy management (almonds, for example).