alexa For Prolonged Computer Users: Laptop Screen Position an
ISSN 2332-0915

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Research Article

For Prolonged Computer Users: Laptop Screen Position and Sitting Style cause more Cervical Musculoskeletal Dysfunction Compared to Desktop,Ergonomic Evaluation

Gamal M Saied*, Ragia M Kamel and Marwa M Mahfouz

Faculties of Medicine and Physiotherapy, Cairo University, Egypt

*Corresponding Author:
Gamal M Saied
Faculty of Medicine
Cairo University, Cairo, Egypt
Tel: +20-2 35676105
E-mail: [email protected]

Received date: October 31, 2013; Accepted date: December 07, 2013; Published date: December 12, 2013

Citation: Saied GM, Kamel RM, Mahfouz MM (2013) For Prolonged Computer Users: Laptop Screen Position and Sitting Style cause more Cervical Musculoskeletal Dysfunction Compared to Desktop, Ergonomic Evaluation. Anthropol 2:117. doi:10.4172/2332-0915.1000117

Copyright: © 2013 Saied GM, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.



Background: There is a recent trend to replace desktop with laptop computers. Laptops are portable, light
weight and space saving, enabling the users to work anywhere and at anytime. But most laptops are designed with
the screen joined to the keyboard, making it impossible to adjust separately in terms of screen height & distance, and
keyboard height & distance. We proposed that computer type and user sitting style affect differently the craniocervical
angle and the load over specific muscles in the back and neck.
Subjects and methods: Thirty volunteer computer workers were studied at the Basic Sciences Department,
Faculty of Physiotherapy, Cairo University from November 2012 to April, 2013. They first assumed the desktop then
laptop sitting styles each for 20 minutes. Electromyography was done for the semispinalis cervicis, capitis and upper
trapezius muscles, and subject’s posture was captured by an infrared camera.
Results: There was a statistically significant increase in the craniocervical angle in desktop than in laptop sitting
styles at p = 0.0001. There was significant decrease in semispinalis cervicis and capitis activities for desktop than
for laptop on both sides at p = 0.0002.
Conclusion: Contrary to laptop, sitting in front of desktop computer increases the craniocervical angle and
lessens the muscular load on the semispinalis cervicis and capitis of both arms. Upper trapezius muscles are not


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