IJPR.2018.102

Type of Article:  Original Research

Volume 6; Issue 2 (March 2018)

Page No.: 2628-2632

DOI: https://dx.doi.org/10.16965/ijpr.2018.102

EFFECT OF DIFFERENT SHOULDER POSITION ON EMG PARAMETER OF ROTATOR CUFF AND DELTOID MUSCLE DURING EXTERNAL ROTATION EXERCISE: A CROSS – SECTIONAL OBSERVATIONAL STUDY

Radhika D. Kariya.

Assistant Professor, Harivandana Physiotherapy College, Munjaka, Rajkot, Gujarat, India.

Address for Correspondence: Dr. Radhika D. Kariya, MPT in musculoskeletal conditions and sports, Assistant Professor, Harivandana Physiotherapy College, Munjaka, Rajkot, Gujarat, India. E-Mail: radhikakaria91@gmail.com

ABSTRACT

Background: The shoulder joint exhibits the greatest amount of motion in the human body. Functional stability is accomplished through the joint capsule, ligaments and glenoid labrum, as well as the dynamic stabilization, particularly the rotator cuff muscles which maintain stability during upper extremity motion. Rehabilitation programs for rotator cuff impingement, repair surgery and athletic conditioning also emphasize strengthening of the shoulder musculature. Altered muscle recruitment will disturb normal scapulohumeral rhythm.

Purpose of study: Aim of the study is to find out effect of 7 different shoulder positions on maximal voluntary isometric contraction (MVIC) for rotator cuff and deltoid muscle.

Methodology: 50 healthy subjects (18 to 25 years) who fulfil inclusion and exclusion criteria were taken. Surface electromyography (EMG) was measured for rotator cuff and deltoid muscle during 7 shoulder exercises: prone horizontal abduction at 100° with full external rotation(ER), prone ER at 90° of abduction, standing ER at 90° of abduction, standing ER in the scapular plane, side lying ER at 0° of abduction, standing ER at 0° of abduction, and 0° of abduction with a towel roll. The peak percentage of maximal voluntary isometric contraction (MVIC) for each muscle was compared by using a 1-way repeated measures analysis of variance.

Result: Prone horizontal abduction at 100° with full ER produced greatest EMG activity for posterior deltoid (96% MVIC), supraspinatus (81%MVIC), and infraspinatus (84% MVIC) and sidelying ER produced greatest EMG activity for teres minor (89%MVIC).

Conclusion: Effect of different shoulder position will affect EMG parameter. So, result of this study will helpful to prescribe various rehabilitation programs.

Key Words: EMG, Rotators Cuff, MVIC, Shoulder Joint, External Rotation.

REFERENCES

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