| Shoulder musculature activation during upper extremity weight-bearing exercise. | |
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MedLine Citation:
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PMID: 12683686 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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STUDY DESIGN: Repeated-measures design comparing 7 static weight-bearing shoulder exercises. OBJECTIVE: The purpose of this study was to determine the demand on shoulder musculature during weight-bearing exercises and the relationship between increasing weight-bearing posture and shoulder muscle activation. BACKGROUND: Weight-bearing shoulder exercises are commonly prescribed in the rehabilitation of shoulder injuries. Limited information is available as to the demands placed on shoulder musculature while these exercises are performed. METHODS: Eighteen healthy college students volunteered for this study. Surface bipolar electrodes were applied over the infraspinatus, posterior deltoid, anterior deltoid, and pectoralis major muscles. Fine-wire bipolar intramuscular electrodes were inserted into the supraspinatus muscle. Electromyographic (EMG) root mean square signal intensity was normalized to 1 second of EMG obtained with a maximal voluntary isometric contraction (MVIC). Subjects were tested under 7 isometric exercise positions that progressively increased upper extremity weight-bearing posture. RESULTS: There was a high correlation between increasing weight-bearing posture and muscular activity (r = 0.97, P < 0.01). There was relatively little demand on the shoulder musculature for the prayer and quadruped positions (2%-10% MVIC). Muscular activation was greater for the infraspinatus than for other shoulder muscles throughout most of the exercise positions tested. CONCLUSION: These results indicate that alterations of weight-bearing exercises, by varying the amount of arm support and force, resulted in very different demands on the shoulder musculature. Specifically, the infraspinatus was particularly active during the weight-bearing exercises used in this study. |
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Authors:
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Tim L Uhl; Thomas J Carver; Carl G Mattacola; Scott D Mair; Arthur J Nitz |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Journal of orthopaedic and sports physical therapy Volume: 33 ISSN: 0190-6011 ISO Abbreviation: J Orthop Sports Phys Ther Publication Date: 2003 Mar |
Date Detail:
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Created Date: 2003-04-09 Completed Date: 2003-07-29 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 7908150 Medline TA: J Orthop Sports Phys Ther Country: United States |
Other Details:
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Languages: eng Pagination: 109-17 Citation Subset: IM |
Affiliation:
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Division of Athletic Training, University of Kentucky, College of Health Sciences, Room 210C, 900 S. Limestone, Lexington, KY 40536-0200, USA. tluhl2@uky.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Analysis of Variance Arm / physiology* Electromyography Exercise / physiology Humans Isometric Contraction / physiology Muscle, Skeletal / physiology* Posture / physiology* Rotator Cuff / physiology Shoulder Joint / physiology* Weight-Bearing / physiology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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