This is a preview of the Joe Sheehan Baseball Newsletter, an e-mail newsletter about all things baseball, featuring analysis and opinion about the game on and off the field from the perspective of the informed outsider. Joe Sheehan is a founding member of Baseball Prospectus and a contributor to Sports Illustrated and Baseball America. He has been writing about baseball for nearly 25 years.
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"The arc of the last 40 years is that we used to break pitchers by using them too much, on a seasonal and game basis, leading to overwork injuries of the shoulder. The emphasis on not doing that, on lowering intraseason and intragame workloads, allowed those pitchers to throw more often at maximum effort. That shift seems to have only moved the injury nexus down about nine inches along the humerus."