I'd be interested in seeing that as well.
My own theory is that sliding always slows you down. Once you hit the ground, friction kicks in to slow you down. I know some feel that if you dive head first that that you can lunge and pick up some speed. But I don't believe that's possible if you're already running your fastest.
Besides, why do runners trying to beat a throw into home plate start their slide late, reach back to touch the plate with their hand, and then slide past the plate? They know they'll get their faster by staying on their feet longer.