Interesting how different environments, physiologies and a lot of other factors all play a role. I spent my lunch hour jogging in 95 degree heat forabout 90 minutes with not a single sip of water and no signs of dehydration. I'm not exactly in tip top physical condition either but I do stay well hydrated in general so when I left the office to go jog I suspect I was already relatively well hydrated and I'm sure that played a part. I have also lived in extremely hot environments since I was 4 years old which probably also plays a role.

I'm glad things worked out well. It's great that you recognize the signs. That was your saving grace.

I hike a lot in 100+ degree weather and don't enjoy the thought of carrying a lot of water so I have gotten in the habit of drinking about a liter of water just previous to going on a hike. This of course wouldn't work when jogging but it works well for hikes as long as you dont mind making lots of stops along the trail to relive yourself in the first hour or two. I imagine this would not be as convenient for females either.