Well, summer has arrived in south Florida. This week we did our first long Sunday ride in 70% humidity and 85F-90F temps and as Phil would say I found myself under pressure from the Sun and had a spot of bother toward the end. I took (3) 24oz bottles of gatoraide and two gels with me. Knowing it was going to be hot and it was already humid at 7:00a we focused on keeping the pace between 17-18mph for our 61mile Sunday ride. The first 30 miles we were in the shade and I felt pretty good although I was sweating rivers. The second half of the ride my HR steadly was increasing and I was feeling the heat more and more. I ended up cutting the ride short at 57 miles and spent the rest of the afternoon drinking water and I am still gassed today.
Take a look at my HR chart and you can see the steady climb in the second half. My HR really tells me when I need to quit. Based on Sai's threads I also did a BP when I got home, I figured being exhausted this would be a good time to check it out. My pulse was 105 and my BP was 107/76 so I felt pretty good about that. Its going to take a few weeks of riding to get use to the heat/humidity again.