|
Fat is an insulatory material, so if you think about it, it wouldnt be good to have lots of blood vessels in fatty tissue (you would loose heat by radiation from the skin surface - diving mammals are covered with fatty tissue to prevent heat loss when underwater), hence your bottom does not get as warm as the rest of you when you run.
In fact, the fatty areas of a body are never as warm (feel any of them on a cold day and you'll see what i mean!), but this is not ususally very noticeable, but when you are running your blood vessels are vasodilated throughout the rest of your body in order to supply muscles with o2, so the constrast between your bottom/fatty areas and the rest of your body is sharply felt.
I expect those who dont feel it so much either have less insulatory material on their bottoms or dont work up the same amount of heat when running!
|