I doubt there would ever be studies that test for different muscle types in different races. There's no real reason to have such a study, and racial studies are not going to make the top of the list for finding by anyone, public or private.
But there *are* different types of muscle fibre that optimize one for sprinting (as opposed to having endurance), and obviously that's the sort of thing that's likely to have a genetic connection.
It's not a good or bad thing, either, until people start putting prejudice into the mix. A greater number of African-Americans are great cornerbacks, but that has no bearing on whether any one individual is a great cornerback, no matter what their race is.
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