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Originally Posted by Catmandu
Like previously said, in a sprint maybe yes, in a long event no. I spent a lot of years as an endurance athlete. In my experience, blood flow to ALL extremities is reduced in order to regulate temperature in the body's core. Not only was getting hard an impossibility during a run, it would take a couple of hours before I could function. My two cents, which are actually worth about a cent and a half.
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actually, blood flow is <b>increased</b> to the extremities when exercising. the only place blood flow stays almost exactly the same is to the brain. arms, legs and tissue near the skin gets an increased amount... extremities, especially the exercising extremities gets the increase so they can have the blood (oxygen and nutrient delivery, waste removal) for exercise and it goes near the surface for temperature regulation. deep tissues like the digestive system get a huge decrease since those are not needed during exercise, they basically slow down to a crawl.
/the more you know (do do dooooooh)