Been a long time since I have been tested to ride in this kind of heat. Was 93 degrees and humid and road 100k on gravel. Made a beginner mistake. Started ride a bit dehydrated. The weekend left me such, with travel and not drinking water, seems all I remember drinking is coffee, pop, or beer. All somewhat diuretic. I should have drank 2 qts of water last night and 2 qts this morning, instead I had two cups of coffee before riding.
After my first 20 miles I had drank everything I had. 100 oz's of water and 24 oz's of pop. I knew I could not go the 11 more miles of my usual route to stock up again on fluids. I was sweating like mad. So took a different flight plan and ended up in Farley Iowa at the gas mart buying 2 jugs of Gatorade, and 2 jugs of water. My throat was parched and my stomach could not hold any more water, my stomach was swelled from all the fluids I drank and I was still thirsty. I think if you get behind on your hydration in this heat and your working out, your body can not absorb the water at the rate you need it.
I'm sitting here now a little dizzy but rehydrating.
Found this in my diary dated 6/23/95
"HOT 91 High humidity, rode trail, like bike shorts, and clipless pedals, Drank 17 lbs of fluid Legs felt good started at 5:45 a.m. Rode 101.5 miles."