I'm not sure how well this translates to football, but
A pitcher’s shoulder joint can rotate as quickly as 7,000 degrees per second—nearly 20 complete revolutions in one second if the shoulder could rotate completely freely—during a pitch, making it one of the fastest movements possible by the body, and this repetitive motion of the arm contributes to the fatigue-related injuries. Ian Byram and his colleagues at Vanderbilt Medical Center are hoping to reduce the damage by identifying pitchers at risk for injury during the preseason, allowing teams to design unique strength training routines for susceptible athletes.Okay, mostly this is posted for the coolness of the topic. I'm not sure what kind of repetitive stress footballers have to deal with, other than repetitive 30mph body-body collisions (a malady that strength training is unlikely to remedy). Mostly though, I'm interested in how aggressively sports medicine is attacking these questions.
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Some years ago I saw a TV show where they were doing a motion-capture study of Nolan Ryan's pitching motion. Supposedly the way Ryan generated power with his legs made his motion the easiest on the body of any pitcher studied. The hope was that lessons could be learned and applied to teaching other pitchers -- don't know if anything came of that.
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