| Change in glenohumeral rotation and scapular position after competitive high school baseball. | |
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MedLine Citation:
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PMID: 20543214 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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CONTEXT: Pathologies such as anterior instability and impingement are common in baseball and have been linked to decreases in internal rotation (IR) and concurrent increases in external rotation (ER). In addition, alterations to scapular position have been identified in this population, but the chronology of these adaptations is uncertain. OBJECTIVES: To determine whether there is a change in range of motion and scapular position after a single baseball season. DESIGN: Prospective cohort. SETTING: High school. PARTICIPANTS: 19 high school baseball players (age 16.6 +/- 0.8 y, mass 78.6 +/- 12.0 kg, height 180.3 +/- 6.2 cm). INTERVENTIONS: Subjects were measured for all dependent variables at preseason and postseason. MAIN OUTCOME MEASURES: Participants were measured for glenohumeral (GH) IR and ER with the scapula stabilized. Total GH range of motion was calculated as the sum of IR and ER. Scapular upward rotation was measured at 0 degrees, 60 degrees, 90 degrees, and 120 degrees of GH abduction in the scapular plane, and scapular protraction, at 0 degrees, hands on hips, and 90 degrees of GH abduction. RESULTS: Overall, the dominant arm had significantly less GH IR (11.4 degrees, P = .005) and significantly more ER (4.7 degrees, P = .001) than the nondominant arm. Total motion in the dominant arm was significantly less than in the nondominant arm (6.7 degrees, P = .001). Scapular upward rotation in the dominant arm significantly increased at 0 degrees (2.4 degrees, P = .002) and significantly decreased at 90 degrees (3.2 degrees, P = .001) and 120 degrees (3.2 degrees, P < .001) of abduction from preseason to postseason. Scapular protraction in the nondominant arm significantly decreased at 45 degrees (0.32 cm, P = .017) and 90 degrees (0.33 cm, P = .006) from preseason to postseason. CONCLUSION: These data suggest that scapular adaptations may be acquired over a relatively short period (12 wk) in a competitive baseball season. Competitive high school baseball players also presented with significant GH motion differences between their dominant and nondominant arms. Total motion was also significantly less in the dominant arm than in the nondominant arm. |
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Authors:
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Stephen J Thomas; Kathleen A Swanik; Charles Swanik; Kellie C Huxel; John D Kelly |
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Publication Detail:
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Type: Comparative Study; Journal Article |
Journal Detail:
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Title: Journal of sport rehabilitation Volume: 19 ISSN: 1056-6716 ISO Abbreviation: J Sport Rehabil Publication Date: 2010 May |
Date Detail:
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Created Date: 2010-06-14 Completed Date: 2010-08-12 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9206500 Medline TA: J Sport Rehabil Country: United States |
Other Details:
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Languages: eng Pagination: 125-35 Citation Subset: IM |
Affiliation:
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McKay Orthopaedic Research Laboratory, University of Pennsylvania, Philadelphia, PA, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adolescent Analysis of Variance Athletic Injuries / etiology, prevention & control Baseball / injuries, physiology* Biomechanics Competitive Behavior* Humans Male Posture* Prospective Studies Range of Motion, Articular Risk Factors Rotation Scapula / injuries, physiology* Schools* Shoulder Impingement Syndrome / etiology, prevention & control Shoulder Joint / injuries, physiology* Statistics as Topic Time Factors |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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