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Article #22 of 50: I have made it a goal of mine to share at least 50 research articles with you to review in 2012. These articles will be shared with no opinion of mine, just purely the information provided in the research and where to go to read more about the topic. This weekly challenge will feature many different aspects of the field: strength, conditioning, nutrition, psychology, etc. If you would like to submit research articles to be included in this segment, please email me a PDF version of the peer reviewed journal article.
The American Journal of Sports Medicine, Vol. 40, No. 3
Background: The abdominal core muscles (internal and external oblique, rectus and transversus abdominis) play an important role in the baseball activities of pitching and hitting. Proper abdominal muscle activation during throwing and swinging is crucial for generating optimal ball velocity and bat speed. Abdominal muscle strains can result in substantial loss of playing time, and their incidence has never been reported in baseball.
Hypothesis: The incidence of abdominal muscle strains in Major League Baseball has been rising over the past 20 years. Injuries contralateral to the dominant arm or batting side are more common and require more time to recover.
Study Design: Descriptive epidemiology study.
Methods: Abdominal muscle strains in baseball players were determined by retrospective review of the Major League Baseball disabled list from 1991 to 2010. Player age, position, dominant hand, batting side, and recovery time were recorded.
Results: There were 393 abdominal muscle strains in Major League Baseball from 1991 to 2010, constituting 5% of all baseball injuries. At least 92% of these injuries were internal/external oblique or intercostal muscle strains, and 44% of injuries were sustained by pitchers. The reinjury rate was 12.1%. An upward trend was seen from 1991 to 2010, especially in early-season injuries, and the overall injury rate was 22% higher in the 2000s than in the 1990s. Pitchers averaged 35.4 days on the disabled list compared with 26.7 days for position players (P > .01); 78.1% of pitcher injuries were contralateral to their dominant arm, and 70.3% of position player injuries were contralateral to their dominant batting side (excluding switch hitters). Position players missed more time for contralateral than for ipsilateral injuries (28.9 vs 21.2 days, P = .03), whereas pitchers missed more time for ipsilateral injuries (44.5 vs 32.8 days, P = .04).
Conclusion: The incidence of abdominal muscle strains in baseball has been increasing over the past 20 years, especially early in the season, and there is a relatively high reinjury rate. This upward trend is in spite of new and more advanced diagnostic procedures, preventive core strengthening exercise programs, and rehabilitation techniques. Injuries contralateral to the dominant arm or batting side are more common.
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