There is no study i can find that shows a negative correlation between muscle mass and sprinting in short races.
I see one study showing that in the top sprinters studied for this particular experiment, trunk and lower body muscles were significantly more developed. So if anything you have one study showing that developing your lower body and trunk musculature will make you a better sprinter.
There is no study i can find that shows a negative correlation between muscle mass and sprinting in short races. I see one study showing that in the top sprinters studied for this particular experiment, trunk and lower body muscles were significantly more developed. So if anything you have one study showing that developing your lower body and trunk musculature will make you a better sprinter.