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Orthop J Sports Med. 2015 Nov 4;3(11):2325967115613988. doi: 10.1177/2325967115613988. eCollection 2015 Nov.

Electromyographic Analysis of the Shoulder Girdle Musculature During External Rotation Exercises.

Author information

1
School of Health Sciences, Liverpool Hope University, Liverpool, UK.
2
Musculoskeletal Science Research Group, Institute of Translational Medicine, University of Liverpool, Liverpool, UK.
3
Department of Musculoskeletal Biology II, Institute of Ageing & Chronic Disease, Faculty of Health and Life Sciences, University of Liverpool, Liverpool, UK.

Abstract

BACKGROUND:

Implementation of overhead activity, a key component of many professional sports, requires an effective and balanced activation of the shoulder girdle muscles, particularly during forceful external rotation (ER) motions.

PURPOSE:

To identify activation strategies of 16 shoulder girdle muscles/muscle segments during common shoulder ER exercises.

STUDY DESIGN:

Descriptive laboratory study.

METHOD:

Thirty healthy subjects were included in this study, and 16 shoulder girdle muscles/muscle segments were investigated (surface electrode: anterior, middle, and posterior deltoid; upper, middle, and lower trapezius; serratus anterior; teres major; upper and lower latissimus dorsi; and upper and lower pectoralis major; fine wire electrodes: supraspinatus, infraspinatus, subscapularis, and rhomboid major) using a telemetric electromyography (EMG) system. Five ER exercises (standing ER at 0° and 90° of abduction, with underarm towel roll, prone ER at 90° of abduction, side-lying ER with underarm towel) were studied. Exercise EMG amplitudes were normalized to EMG at maximum ER force in a standard position. Univariate analysis of variance and post hoc analysis applied on EMG activity of each muscle were used to assess the main effect of the exercise condition.

RESULTS:

Muscular activity differed significantly among the ER exercises (P < .05 to P < .001). The greatest activation for anterior and middle deltoid, supraspinatus, upper trapezius, and serratus anterior occurred during standing ER at 90° of abduction; for posterior deltoid, middle trapezius, and rhomboid during side-lying ER with underarm towel; for lower trapezius, upper and lower latissimus dorsi, subscapularis, and teres major during prone ER at 90° of abduction; and for the clavicular and sternal part of the pectoralis major during standing ER with underarm towel.

CONCLUSION:

Key glenohumeral and scapular muscles can be optimally activated during specific ER exercises, particularly in positions that stimulate athletic overhead motions.

CLINICAL RELEVANCE:

These results enable sports medicine professionals to target specific muscles during shoulder rehabilitation protocols while minimizing the effect of others, providing a foundation for optimal evidence-based exercise prescription. They also provide information for tailored muscle training and injury prevention in overhead sports.

KEYWORDS:

electromyography; external rotation; overhead sports; rehabilitation; shoulder exercises

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