This is an interesting study reviewed by Mike Reinold on the differences between the shoulder of pitchers and position players and how they change during a season. One of the focal points was scapular upward rotation comparisons. They found an increase in scapular upward rotation in the position players compared to the start of the season, while the pitchers did not have as significant a change. It may help explain why pitchers have injured shoulders much more frequently. Check it out!