Originally Posted by u235

One thing I learned pretty quick... I ride a lot of rolling terrain, it is either up or down. If I am going to take a break it is very tempting to do it at the peak of a climb. For heating and cooling that is the worst possible time. When you stop at the top your body is creating the max amount of heat and you no longer have the wind cooling, the sudden "stopping at the red light" situation. Done with your break or pause you proceed down the other side. Much less heat being generated and full on wind cooling and you probably build up sweat from the extreme. When it's warm out anyway this is usually not a problem but any sweat buildup prior when it is under say maybe 50-60F (depends on the person and clothes) and it can create a condition that is hard to recover from as the ride continues.