When I was riding with Kraig Koski in Colorado I told him that right before RAAM I planned to ride the trainer in my workshop with heaters going to get used to the heat. Kraig said, "You're gonna make a puddle." Kraig was way off base, or maybe he was just assuming my shop floor was level...I made a stream.
The heaters would only get the shop to 95 degrees. At first I was disappointed because I thought I wanted it hotter than that. Within about 20 minutes I learned that was plenty hot. Initially it felt pretty good. My muscles just responded really well to the heat, and unlike most of my rides I felt strong right away instead of having to warm up for two hours before I started feeling good. I set the resistance at 4% and was cruising easily at 220W (these Watt numbers are from my trainer and may have no connection to reality). After about 20 minutes I was starting to feel the heat and having to cut my pace back. By 40 minutes I was trying to keep my power below 110W because (for those not familiar with power numbers that equates to roughly 10 mph on a 4% grade) if I stopped paying attention my power would increase and my heart rate would skyrocket and I'm pretty sure I'd be unable to thermo-regulate in about 10 minutes.
I had planned on riding for about an hour or hour and fifteen minutes. That's about all I can stand on the trainer in good conditions. Especially on a pretty nice day when Heather is out on a real bike ride.
At an hour I was out of water so I quickly re-filled my bottles and got back on the bike. Since this was mostly a psychological workout I decided I'd force myself to make it to 1:30. When I got to 1:30 I decided I'd go until I was out of water. When I ran out of water I tried to force myself to go for 10 more minutes. I haven't done a single ride this year where I felt like I couldn't go another hour (or more) beyond when I ran out of water. Yesterday I made it about 7 minutes after the water was gone.
I'd ridden a couple minutes short of two hours. But only 25 (trainer) miles. I'm hoping that 95 degrees in absolutely still air is worse than 105 in moving air. And I think it is. I hope it is. Because that really sucked a lot.
I'm going to do the same thing tonight. But I won't do it for that long because I've got to get to the airport.