Physiologist Peter Weyand of Southern Methodist University, lead author of a study published Jan. 21 in the Journal of Applied Physiology, says "“If you just find a way to rev up those contractile fibers for the muscle, then everything else from human biology and gait would allow us to be that fast." Read more about the study here at Wired magazine online   http://www.wired.com/wiredscience/2010/02/40-mph-human/#ixzz0eVq2zhVz