Quote Originally Posted by Zen View Post
Hyperthermia.
The chills are your body's attempt to thermoregulate.
It is good I followed my instinct to take that as a sign that I was done riding for the day... I was drinking every 10 minutes or so and the chills were not bad. I didn't think anything about getting chilled on the roads in full shade, trees give their own form of air conditioning, but it got my attention when I got out of the shade and had been in the sun for a bit and was still chilled.

Obviously I've still got to get this hydration thing worked out. I had also had a very good session with my personal trainer right before the ride (and he makes sure I don't forget to drink).

I didn't have my bike computer and that helps me to at least pay attention to distance and drinking (when I've gone x distance then it's time for a drink). I have always had a problem drinking enough when being active.