The perception of heat on exercise

I've noted in many of the marathons I've paced that the runners are unaware of how much the temperature is slowing them down. I've also realized in my own running that mild temperatures tend to produce the perception of increased fatigue, rather than being too hot. I've found some research that backs this up, and updated my pages on http://fellrnr.com/wiki/Running_in_the_Heat and http://fellrnr.com/wiki/Impact_of_Heat_on_Marathon_Performance

 

I've even changed my list of marathon racing mistakes to make this #2, as it's the most common problems I see when pacing marathons. (It would be #1, but while mistake #1 is rare, it can kill you)