Heat exhaustion mystery solved
Sunday, August 31st, 2008Starting sometime last year, I started having problems with heat exhaustion on longer, more challenging rides. The funny thing is that no matter how hot it is, it’s not an issue on shorter rides (less than 100 miles). Last week, I found out why.
In preparation for the Everest Challenge, I climb Mary’s Peak 3 times every Saturday or Sunday. Last week, I strapped on a heart rate monitor and rode the same as I normally do just to see how hard I was working. I discovered that even on extended rides, my HR is over 160 a lot of the time and practically never drops below 155 except when I’m going down a hill. That’s fine if I’m on my trainer in the garage for an hour (in fact, I’ll take my HR higher than that). But putting those kind of numbers up hour after hour? I had no idea I was doing that — no wonder I felt so bad.
Today I did Mary’s Peak again with the HRM strapped on and took it easy. I tried to keep my HR around 145 most of the time and didn’t spend much time over 150. It was a totally different type of ride. My second climb was faster than the first, and my third was faster than the second. Plus, I was able to enjoy the scenery.
The bad news is that my average speed that was 0.7mph slower than last week — that’s huge in cycling terms. Nonetheless, I was happy with the results. I could have easily done another lap. Just for the heck of it, I cranked up the effort near the end to see how much strength was left, and there was plenty of gas left in the tank. Even though I lost almost 18 minutes during the ride, I was in MUCH better shape afterwards, so I think I’d recover the lost time if I had to stay out much longer. Things are looking good for the Everest.
Bryan wants to go riding tomorrow and put the hurt on me since he figures I will have ridden too hard today. I’m looking forward to it….

