Just typing this out to try to figure out what happened this morning. I went for a 6 mile run, follwed by a 40 mi bike ride. My run partner joined me at mi 20 of the ride and we decided to run 2 mi after as a quick brick. (I normally do long run Sunday, followed by an hour or so ride, but I decided to do my long ride monday instead.) I had my regular sips of water at my regular intervals on both the run and bike. I finished 2 bottles of g2 and a bottle of gatorage mixed with water (along with some clif shot gels and a fig newman or 2). This is always what I do. I have never had any issues with hydration or fueling. I felt somewhat fatigued, but when I got in the calories, I felt better.
Once we got off the bike, and started running, it went downhill fast. I had a side stitch, I figured from drinking too much, I was going SLOW! and getting slower. We turned around at about a mile and I told my running partner to go ahead, I would walk. I started walking, and I became short of breath, my ears started ringing and my vision went to black and gold dots. I sat on a bench and tried walking again after a bit, but it was worse. Eventually, I saw a woman parking by the street and asked if she could drive me to my car.
It is now in the 80s and 100% humidity at 5am (when I started), but I am used to that. One friend said that Gatorade did not sufficiently replace electrolytes, one friend said it was the extreme heat, one friend said I didn't hydrate enough the day before...but NOTHING was different than what I normally do except the workout. (and I wouldn't say it was "harder")
Sorry for the rambling, but I would hate for this to become a trend. It scared the daylights out of me. Any thoughts from the experts here?