Effect of Movement Plane and Shoulder Flexion Angle on Scapular Upward Rotator During Scapular Protraction Exercise (운동면과 어깨 관절 굽힘 각도가 어깨뼈 내밈 운동 시 어깨뼈 위쪽 돌림근에 미치는 영향)

정성대; Jonghyuck Weon (원종혁); Jung, Do-Young (정도영)

Effect of Movement Plane and Shoulder Flexion Angle on Scapular Upward Rotator During Scapular Protraction Exercise

Journal of the Korean Society of Physical Medicine
Abbr : J Korean Soc Phys Med
2013, 8(1), pp.41-48
Publisher : The Korean Society of Physical Medicine
Research Area : Medicine and Pharmacy > Physical Therapy > Other physical therapy

정성대 ¹, Jonghyuck Weon ², Jung, Do-Young ³

¹연세대학교 물리치료학과
²중부대학교 물리치료학과
³중부대학교

Candidate

ABSTRACT

PURPOSE: This study was to determine the effect of the plane of movement (sagittal plane vs. scapular plane) and shoulder flexion angle (90° vs. 130°) during scapular protraction exercises in healthy subjects by investigating the elecromyographic (EMG) activities of the serratus anterior (SA), upper trapezius (UT), and pectoralis major (PM). METHODS: Twenty-one healthy subjects participated in this study. Subjects performed maximal scapular protraction at the 90° or 130° shoulder flexion angles in the sagittal or scapular planes. Surface EMG was recorded from the SA and UT, and PM muscles. Dependent variables were examined by 2 (plane) × 2 (angle) repeated measures of analysis of variance (ANOVA). RESULTS: Significantly increased EMG activities in theSA and UT were found during scapular protraction exercise at the 130° shoulder flexion angle in the sagittal and scapular plane. Also, EMG activity of the PM significantly decreased at the 130° shoulder flexion angle in the sagittal plane and the 90° and 130° shoulder flexion in the scapular plane. CONCLUSION: we recommend scapular protraction exercise at the 90° shoulder flexion in the sagittal plane to selectively strengthen the SA muscle with limitation of upper trapezius activity and at the 130° shoulder flexion in the scapular plane to selectively strengthen the SA muscle with limitation of pectoralis major activity.

KEYWORDS

EMG, Scapular plane, Serratus anterior

Citation status

* References for papers published after 2023 are currently being built.

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