Why did it happen???

Question

today it was a cold day, below lets say 20 degress F. I ran the mile. then hour later ran the 800 meters. I was cold before the 800 meters, and i ran the 800 meters. and after the 800 meters i felt lite headed and i blacked out. wat could have had happen to me? and why do you think I blacked out for?

Answer 1

Lots of things could have happened, but my guess is that your blood vessels were contracted before you ran, and since you worked a lot in a short time, your entire body was starved for oxygen (the lightheadedness) and when you slowed down (slowed breathing) your brain just couldn't handle the oxygen deprivation and shut your body down.

Answer 2

This should be in the running section.