Originally Posted by
markjenn
I find that if I use Myfitnesspal.com and plug in 12-14 mph for my rides (even though I typically ride faster), that I get reasonable correlation between body weight changes and exercise. 1100 calories per hour is off the charts... I think 400-500 is a lot more realistic for most cyclists. And I don't think you can just assume that you will burn this over the course of a very long ride as you don't maintain the same intensity. I doubt touring cyclists riding ten hours per day consume 5K calories above their baseline metabolism.
- Mark
Putting out a steady 200W will burn about 700 cal/hour, so 500 cal/hour would be about 140W. I've averaged 160W for 7 hours doing a double-metric century, which comes out to be almost 5,000 cal. And I'm not exactly fast - there are a lot of riders who are faster and put out more power (burn more calories) than me for longer times.
10 hours at a 140W average power is easy to imagine, even for 10 hours of riding.