Well found this wikianswers related thing:
Quote:
Do African American athletes have an extra muscle or ligament?
No, but many African Americans have different attachment locations for their muscles. Think of your skeleton and its joints as levers, and if you have different types of levers, some are designed for strength and others for speed.
Everything else I found was either angry comments or about slavery > >..
Though aside from the wikianswers the rest came up as a direct "No".