Skin temperature during running.

A study using infra-red colour thermography comparing two runner before and after exercise; the first athlete is an Olympic class marathon runner. The initial test is on a treadmill then repeated outside in the summer. The other runner is a club marathon runner; comparisons are made regarding the levels of fat. They are tested intermittently. The club runner overheated and had to retire; his skin temperature was very high, he then developed heat exhaustion.