so hot your cold!

I don't know how long the run was so its hard to say if you were drinking enough.

My guess is perhaps your body temp got too high. If it was really humid it your sweat may not have been enough to cool you down even though you drank enough.

But, there are other who would know better than I. I'd like to hear what others think, too

Chills is a sign approaching heat stroke. If that should happen, you must stop exercising immediately and do all you can to cool yourself off. Douse yourself in water, soak in a tub, river, or lake, get to shade immediately, remove your hat while in the shade. 

Heat stroke is a life-threatening emergency. Take it seriously. You may be well hydrated and your electrolytes may be in balance, but if your body cannot efficiently shed enough heat to cool itself, it can become deadly.  There is a great article in this month's Bicycling magazine about heat training.  You need to acclimate yourself to the heat and humidity, little by little, and with workouts in a certain HR training zone.

I'm a Peds ER nurse, but I do know quite a bit about this.  I'd hate to see you end up really sick.

 Melanie

http://www.ohsaa.org/medicine/heatillness.htm

Check this out for symptoms of heat illness in athletes.

For the hot, humid weather try consistent, but shorter workouts. The Long workouts will put you at the most risk. But consistency will help you keep your fitness level.

Hope this helps

Happened to me yesterday too...or just the beginning. 17 k run in 26+ (c ) degrees and high humidity. I felt my arms and torso get a bit of a chill.

I knew the signs and got in the shade and just walked around a bit and poured water over my head. I probably should have stopped completely but I was miles from home and I was doing some "hot weather conditioning" in preparation for a half marathon coming up. After I felt better and more relaxed I started running again.

Luckily I knew the signs and responded appropriately. Heat stroke is not something to take lightly. There is nothing worse than passing out or dying alone on the side of a path - it give the couch potato types another "I told you so" excuse to use.

Take it easy out there! 

wow- this happened to me yesterday too! I was shivering! I KNOW I wasn't prepared to run in the heat, but I honesly didn't think it was that hot at first. And I didn;t think 45 minutes out there was long enough to get into trouble. Part of my problem, I think, was my route was completely exposed, no shade at all.

I kinda thought maybe I was imagining the shivering, I mean, who shivers in the heat?  Oops. Thanks for the information.