http://tinyurl.com/g3vvj Tim Noakes' Central Governor Theory

Got this link from my running list- it mostly pertains to cycling, and is _very_ interesting!

Psych Out Your Body-

....For years, exercise scientists assumed that we—athletes, gym goers,
fitness walkers—become weary and slow down when our muscles run out of oxygen. Not so, says researcher Timothy D. Noakes, M.D., a professor of exercise and sports science at the University of Cape Town, South Africa. He points to his 2001 study that found when cyclists quit out of exhaustion, on average after 62 miles, their muscles still had plenty of oxygen left to continue pedaling. Essentially, Noakes says, their brains turned on the discomfort before
they actually ran out of fuel in order to help shield their bodies from potential injury.