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

Aydin Valizadeh; Reza Rajab; Farhad  Rezazadeh; Azam  Mahmoudpour; Shirin Aali

Zahedan Journal of Research in Medical Sciences

The Official Journal of Zahedan University of Medical Sciences

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

Author(s):

Aydin Valizadeh¹,

Reza Rajab²,

Farhad Rezazadeh^3,*,

Azam Mahmoudpour⁴,

Shirin Aali⁵

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

2Tehran, Iran

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

4Department 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

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

Zahedan Journal of Research in Medical Sciences:Vol. 16, issue 6

Published online:Jun 19, 2013

Article type:Research Article

Received:May 28, 2012

Accepted:Aug 02, 2012

How to Cite:Aydin ValizadehReza Rajab Farhad RezazadehAzam MahmoudpourShirin AaliComparison 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.16(6):null-null.

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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