Document Detail

Changes in humeral torsion and shoulder rotation range of motion in high school baseball players over a 1-year period.
MedLine Citation:
PMID:  23434341     Owner:  NLM     Status:  Publisher    
BACKGROUND: The torsional stress on a baseball player's throwing limb has been theorized to affect humeral retrotosion during skeletal maturity. This study investigated 1) changes in humeral retrotorsion and shoulder rotation range of motion over a 1-year period in high school baseball players, and 2) relationship between a 1-year change in dominant limb retrotorsion and the number of seasons participants played on organized baseball teams. METHODS: Humeral retrotorsion and shoulder range of motion were measured a year apart in a total of 138 high school baseball players. Baseball participation history over the year was captured using a questionnaire. Changes in bilateral humeral retrotorsion and range of motion over a year and effects of baseball participation on changes in humeral retrotorsion and range of motion were assessed using analysis of variance models. FINDINGS: Humeral retrotorsion did not significantly change over the year regardless of the number of seasons participants played baseball (P>0.05). The participants' dominant limb internal rotation range of motion decreased slightly over a year (2.0°, P=0.015), while external rotation (7.8°, P<0.01) and total rotation (11.9°, P<0.01) range of motion decreased bilaterally among the participants who only played baseball in 1 season. INTERPRETATION: Adaptation in humeral retrotorsion seems to occur prior to high school age. Our observations suggest that change in shoulder range of motion in high school baseball players are attributed to soft tissue contracture. This provides a support that stretching exercises should be implemented when significant changes in range of motion are identified in high school baseball players.
Sakiko Oyama; Elizabeth E Hibberd; Joseph B Myers
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-2-19
Journal Detail:
Title:  Clinical biomechanics (Bristol, Avon)     Volume:  -     ISSN:  1879-1271     ISO Abbreviation:  Clin Biomech (Bristol, Avon)     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-2-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8611877     Medline TA:  Clin Biomech (Bristol, Avon)     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2013. Published by Elsevier Ltd.
Department of Health and Kinesiology, University of Texas at San Antonio, San Antonio, TX, San Antonio, TX, USA; Department of Exercise and Sport Science, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA. Electronic address:
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