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J Sport Rehabil. 2018 Jul 24:1-24. doi: 10.1123/jsr.2018-0059. [Epub ahead of print]

Comparison of Shoulder Protraction Strength and Electromyography Activity of Serratus Anterior and Pectoralis Major in Subjects With or Without a Winged Scapula.

Author information

1
1 Department of Rehabilitation Science, Graduate School, INJE University, Gimhae, South Korea.
2
2 Department of Rehabilitation, Wonju Severance Christian Hospital, South Korea.
3
3 Department of Physical Therapy, INJE University, Gimhae, South Korea.

Abstract

CONTEXT:

A winged scapula (WS) is associated with faulty posture caused by weakness of the serratus anterior (SA), which mainly acts as a scapular stabilizer muscle. It is important to accurately assess and train the SA muscle with a focus on scapula stabilizers during musculoskeletal rehabilitation of individuals with a WS.

OBJECTIVE:

We examined muscle activity in the SA and pectoralis major (PM), upper trapezius (UT) and anterior deltoid (AD)as well as shoulder protraction strength during isometric shoulder protraction, in individuals with and without a WS.

DESIGN:

Cross-sectional study.

SETTING:

A clinical biomechanics laboratory.

PARTICIPANTS:

In total, 27 males with no shoulder, neck, or upper extremity pain were participated.

MAIN OUTCOME MEASURES:

Isometric shoulder protraction strength was collected and surface electromyography (EMG) was used to measure the activity of the SA, PM, UT and AD muscles and selective SA activity ratio to other shoulder muscles.

RESULTS:

EMG activity of the SA muscle and shoulder protraction strength were significantly lower in individuals with a WS compared with the non-WS group (p < 0.05). In contrast, PM muscle activity and the PM/SA, UT/SA, AD/SA ratio were significantly greater in individuals with a WS than in individuals without winging (p < 0.05).

CONCLUSIONS:

Isometric shoulder protraction for measuring SA strength in individuals with a WS should focus on isolated muscle activity of SA, and SA strengthening exercises are important for individuals with a WS.

KEYWORDS:

Pectoralis major; Serratus anterior; Shoulder protraction strength; Winged scapula

PMID:
30040007
DOI:
10.1123/jsr.2018-0059

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