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Originally Posted by Catmandu
My previous answer states "in my experience...". I stick by my comments. Regardless of the weather, I always ended a long run with numbed hands, feet, arms, legs, and pecker. I understand the mechanics of Harry's answer, however my experience tells me there is more going on than described by him.
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i don't doubt that you did experience that. but the mechanics i mentioned is the main way the body deals with heat dissipation during exercise. it uses blood as a medium to transfer excess heat buildup in the core towards the skin where the skin, via conduction, radiation, and (blanking on third main mechanism of heat transfer from skin to environment), transfers the heat out of the body (this is one of the reasons you sweat). if all of the blood stayed at the core you'd overheat and die from it. and when exercising, you're body doesn't need to make use of the digestive tract so there's no need to shunt blood to it. when you run, you're not using your arms in a manner that requires lots of blood flow, so that is shunted away from the arms to some extent. the heart, head, and exercising muscles get the most blood flow.
if you're interested, when i get home from vacation i'll send you a link to the ex. phys. book i used in class, it's pretty good. just send me a pm and i'll make sure i do it.
oh, and for the initial question, i've never experienced a hard on while exercising, i've usually found that a good way to get rid of one... but i don't see why it would be impossible. at least to get a chubby.