A comprehensive analysis of muscle recruitment patterns during shoulder flexion: An electromyographic study

Journal article


Wattanaprakornkul, Duangjai, Halaki, Mark, Boettcher, Craig, Cathers, Ian and Ginn, Karen A.. (2011). A comprehensive analysis of muscle recruitment patterns during shoulder flexion: An electromyographic study. Clinical Anatomy. 24(5), pp. 619 - 626. https://doi.org/10.1002/ca.21123
AuthorsWattanaprakornkul, Duangjai, Halaki, Mark, Boettcher, Craig, Cathers, Ian and Ginn, Karen A.
Abstract

Although flexion is a common component of the routine clinical assessment of the shoulder the muscle recruitment patterns during this movement are not clearly understood making valid interpretation of potential muscle dysfunction problematic. The purpose of this study was to comprehensively examine shoulder muscle activity during flexion in order to compare the activity levels and recruitment patterns of shoulder flexor, scapular lateral rotator and rotator cuff muscles. Electromyographic (EMG) data were recorded from 12 shoulder muscles sites in 15 volunteers. Flexion was performed in standing in the sagittal plane at no load, 20%, and 60% of each subject's maximum load. EMG data were normalized to maximum values obtained during maximum voluntary contractions. Results indicated that anterior deltoid, pectoralis major, supraspinatus, infraspinatus, serratus anterior, upper, and lower trapezius were activated at similar moderate levels. However, subscapularis was activated at low levels and significantly lower than supraspinatus and infraspinatus. Similar activity patterns across time were demonstrated in the muscles that produce flexion torque, laterally rotate the scapula, as well as supraspinatus and infraspinatus, and did not change as flexion load increased. The onset of activity in supraspinatus and anterior deltoid occurred at the same time and prior to movement of the limb at all loads with infraspinatus activity also occurring prior to movement onset at the medium and high load conditions only. Posterior rotator cuff muscles appear to be counterbalancing anterior translational forces produced during flexion and it would appear that supraspinatus is one of the muscles that consistently “initiates” flexion. Clin. Anat. 24:619–626, 2011. © 2011 Wiley-Liss, Inc.

Keywordsshoulder; electromyography; flexion; rotator cuff; motor control
Year2011
JournalClinical Anatomy
Journal citation24 (5), pp. 619 - 626
PublisherJohn Wiley & Sons, Inc.
ISSN0897-3806
Digital Object Identifier (DOI)https://doi.org/10.1002/ca.21123
Scopus EID2-s2.0-79959843248
Page range619 - 626
Research GroupSchool of Behavioural and Health Sciences
Publisher's version
File Access Level
Controlled
Place of publicationUnited States of America
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