Document Detail

Electromyographic activity in the immobilized shoulder girdle musculature during scapulothoracic exercises.
MedLine Citation:
PMID:  16813779     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To quantify the electromyographic activity in the shoulder girdle musculature during scapulothoracic exercises performed in a shoulder immobilizer in asymptomatic men. DESIGN: Descriptive. SETTING: Motion analysis laboratory at a tertiary care center. PARTICIPANTS: Five asymptomatic male volunteers ages 24 to 32 years. INTERVENTION: Fine-wire (supraspinatus, infraspinatus, upper subscapularis) and surface (deltoids, trapezii, biceps, serratus anterior) electrodes recorded electromyographic activity from each muscle during scapular clock, elevation, depression, protraction, and retraction exercises completed during a single testing session in random order. MAIN OUTCOME MEASURE: Mean peak normalized (percentage of maximal voluntary contraction [MVC]) electromyographic activity of each muscle during each exercise. RESULTS: Biceps activity was uniformly low (<20% MVC), whereas upper subscapularis activity was uniformly high (40%-63% MVC). Both scapular depression and protraction elicited low activity (<20% MVC) in the supraspinatus, infraspinatus, anterior deltoid, and biceps brachii muscles, while generally producing greater than 20% MVC activity in the trapezii and serratus. Scapular depression produced the largest serratus anterior activity (47% MVC). CONCLUSIONS: These data are the first to describe the electromyographic activity during scapulothoracic exercises while in a shoulder immobilizer. Based on electrophysiologic data in normal volunteers, our findings suggest that during periods of shoulder immobilization: (1) scapular depression and protraction exercises could potentially be safely performed after rotator cuff repair to facilitate scapulothoracic rehabilitation, (2) all exercises studied could potentially be safe after superior labral anteroposterior shoulder repair, and (3) all exercises studied should be avoided after subscapularis repair. Further investigation in symptomatic individuals may facilitate refinement of these recommendations.
Jay Smith; Diane L Dahm; Kenton R Kaufman; Andrea J Boon; Edward R Laskowski; Brian R Kotajarvi; David J Jacofsky
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Archives of physical medicine and rehabilitation     Volume:  87     ISSN:  0003-9993     ISO Abbreviation:  Arch Phys Med Rehabil     Publication Date:  2006 Jul 
Date Detail:
Created Date:  2006-07-03     Completed Date:  2006-08-10     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  2985158R     Medline TA:  Arch Phys Med Rehabil     Country:  United States    
Other Details:
Languages:  eng     Pagination:  923-7     Citation Subset:  AIM; IM    
Department of Physical Medicine and Rehabilitation, Mayo Clinic College of Medicine, Rochester, MN 55905, USA.
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MeSH Terms
Exercise Therapy / methods*
Muscle, Skeletal / physiology*
Range of Motion, Articular / physiology
Shoulder Joint / physiology*

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