Quote Originally Posted by snapdragen
After I had heat exhaustion, I was told I would be more susceptible to it in the future. Does anyone know if this is true, or was I being told an "old wives tale"?
Yes, it's true. I got a bad case of it on a century ride, and for a couple of years afterwards got sick from the heat pretty quickly. I remember reading about it to confirm my suspicion. It felt like my internal thermostat was damaged - I couldn't handle heat at all, nevermind doing 50 miles in 100+ degrees.

That was 20 years ago, and since then I've learned to over-hydrate. And I have moved to a hotter climate, so I can handle heat much better now.