With all the breaking balls being thrown and big pitch counts in the recent LLWS coverage, we've been discussing this topic on another (local) board. I know its been discussed round-and-round here before, but we uncovered an article that seems to have some data behind it, so I thought I'd post it for some discussion here. The full article costs $25 to read from a journal so I didn't get the whole thing, but here is a link to a wider summary and some pasted text from that summary below.
Thoughts?
http://www.asmi.org/asmiweb/research/youthbaseball.htm
...For decades, experts have argued that the number of pitches thrown, types of pitches thrown, and quality of pitching mechanics are related to arm pain and subsequent injury. These relationships, however, have never been investigated scientifically.
To elucidate how pain develops in pitchers, the USA Baseball Medical & Safety Advisory Committee sponsored an American Sports Medicine Institute study of factors related to shoulder and elbow pain at the youth baseball level. In this study, participants included 476 youth baseball pitchers who volunteered to be followed for one season. These 9-14 year old pitchers were from youth baseball parks throughout Alabama, including Little League, Dixie Youth, and Birmingham Metro League parks. Coaches and players were interviewed before the season, after each game, and after the season, thereby providing the very first account of pain and playing habits during the course of a season. The major findings of the study were:
* The incidence of elbow or shoulder pain increased with the number of pitches thrown in a game.
* The incidence of elbow or shoulder pain increased with the number of pitches thrown in a season.
* Pitchers who threw curveballs or sliders had greater incidence of pain than those who didn’t.
* No relationship between poor mechanics and increased risk of pain could be established.
Based upon the results from this study, it is recommended pitchers between 9 and 14 years old do not throw the curveball or slider. These pitchers should utilize the fastball and change-up exclusively.
...While this study presents new, valuable data, it represents only a foundation for future research. Prospective studies are needed to correlate pitching parameters (pitch counts, pitch types, and pitching mechanics) with injury (surgery, time missed) developed during a career.
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