Rotator cuff coactivation ratios in participants with subacromial impingement syndrome

Abstract Coactivation of the rotator cuff is vital to glenohumeral joint stability by centralising the humeral head within the glenoid fossa. Yet in individuals with subacromial impingement, it is hypothesised that rotator cuff coactivation abnormalities are present that could contribute to their sh...

Full description

Saved in:
Bibliographic Details
Published in:Journal of science and medicine in sport 2009-11, Vol.12 (6), p.603-608
Main Authors: Myers, Joseph B, Hwang, Ji-Hye, Pasquale, Maria R, Blackburn, J. Troy, Lephart, Scott M
Format: Article
Language:English
Subjects:
Adult
Case-Control Studies
Chromium alloys
Coactivation
Data collection
Electrodes
Electromyography
Female
Humans
Impingement
Injury
Male
Middle Aged
Patients
Physical Medicine and Rehabilitation
Range of Motion, Articular
Rotator cuff
Rotator Cuff - physiopathology
Shoulder
Shoulder Impingement Syndrome - physiopathology
Sports Medicine
Sports training
Weightlifting
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Abstract Coactivation of the rotator cuff is vital to glenohumeral joint stability by centralising the humeral head within the glenoid fossa. Yet in individuals with subacromial impingement, it is hypothesised that rotator cuff coactivation abnormalities are present that could contribute to their shoulder pain. The purpose of this study was to determine if abnormal rotator cuff coactivation and deltoid activation patterns exist in participants with subacromial impingement. Rotator cuff (supraspinatus, infraspinatus, and subscapularis) coactivation and middle deltoid activation was assessed during an elevation task. ANOVA models were used to compare muscle activation patterns in 10 participants with subacromial impingement and 10 control participants. Participants with impingement exhibited decreased rotator cuff coactivation (subscapularis–infraspinatus and supraspinatus–infraspinatus) and increased middle deltoid activation at the initiation of elevation (0–30° of humeral elevation). The participants with impingement also had higher subscapularis–infraspinatus and supraspinatus–infraspinatus coactivation above the level of the shoulder where pain is typically present (90–120° of humeral elevation). The results indicate that individuals with subacromial impingement exhibit rotator cuff muscle coactivation and deltoid activation abnormalities during humeral elevation that might contribute to the encroachment of the subacromial structures associated with subacromial impingement.
ISSN:1440-2440
1878-1861
DOI:10.1016/j.jsams.2008.06.003