Comparison of the Forward Head Posture on Scapular Muscle Contributions During Shoulder Flexion of Predominant Arm in Women with Forward Head Posture

AUTHORS

Aydin Valizadeh 1 , Reza Rajab 2 , Farhad Rezazadeh 3 , * , Azam Mahmoudpour 4 , Shirin Aali 5

1 Department of Physical Education, Faculty of Education and Psychology, University of Mohaghegh Ardabili, Ardabil, Iran

2 Tehran, Iran

3 Department of Sport Medicine, Faculty of Physical Education and Sport Sciences, Kharazmi University, Tehran, Iran

4 Department of Sport Medicine, Faculty of Physical Education and Sport Sciences, Tehran Universiy, Department of Sport Medicine, Faculty of Physical Education and Sport Sciences, Tehran Universiy, Tehran, Iran

5 Department of Sport Medicine, Faculty of Physical Education and Sport Sciences, Kharazmi University, Tehran, Iran

How to Cite: Valizadeh A, Rajab R, Rezazadeh F , Mahmoudpour A , Aali S. Comparison of the Forward Head Posture on Scapular Muscle Contributions During Shoulder Flexion of Predominant Arm in Women with Forward Head Posture, Zahedan J Res Med Sci. 2014 ; 16(6):-.

ARTICLE INFORMATION

Zahedan Journal of Research in Medical Sciences: 16 (6)
Published Online: June 19, 2013
Article Type: Research Article
Received: May 28, 2012
Accepted: August 02, 2012

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Abstract

Background: Because of the corrigibility of forward head posture (FHP), the recognition of the relationship between this deformity and scapular rotator muscles may be influential on scapular muscle activities in detection of better way to improve movement disorders. Therefore, the aim of this study was to compare the serratus anterior, upper and lower trapezius muscle contributions during shoulder flexion without weight in women with and without FHP.

Materials and Methods: In this case-control study was carried out on 18 women with FHP and 14 healthy subjects who were matched. EMG muscle activities were recorded during shoulder flexion and abduction. The value of each muscle divided on total muscle values to calculate contribution ratio and independent t-test was used to compare contributions between groups.

Results: There was a significant decrease in serratus anterior muscle activity ratio (p=0.002) and a significant increase in upper trapezius muscle activity ratio (p=0.001) between subjects with and without FHP. There was not also significant difference in contribution of lower trapezius muscle.

Conclusion: Contribution of the serratus anterior muscle in individuals with forward head posture is less than healthy subjects. The contribution of upper trapezius muscle also in individuals with FHP is greater than healthy subjects.

Keywords

Electromyography Forward Head Posture Shoulder Flexion

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