Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/20981
Title: EMG median frequency changes in the neck-shoulder stabilizers of symptomatic office workers when challenged by different physical stressors
Authors: Szeto, GPY 
Straker, LM
O'Sullivan, PB
Keywords: Computer use
Electromyography
Median frequency
Office ergonomics
Power spectrum
Work-related neck and upper limb disorders
Issue Date: 2005
Publisher: Elsevier
Source: Journal of electromyography and kinesiology, 2005, v. 15, no. 6, p. 544-555 How to cite?
Journal: Journal of electromyography and kinesiology 
Abstract: The problem of work-related neck and upper limb disorders among computer users has been reported extensively in the literature, and commonly cited risk factors include static posture, speed and force of keyboard operation. The present study examined changes in median frequency (MF) of the neck-shoulder muscles in symptomatic and asymptomatic office workers when they were exposed to these three physical stressors. A quasi-experimental Case-Control design was used to examine MF changes in two groups of female office workers when they were subjected to controlled doses of computer work involving prolonged static posture, increased typing speed and increased typing force. The MF of four major neck-shoulder muscles were examined bilaterally and compared between groups. The MF changes over time-at-task did not clearly illustrate any muscle fatigue mechanism. However, Case Group consistently showed trends for higher MF than the Control Group, and this pattern was observed in response to all three physical stressors. The consistent group differences in MF suggest different muscle recruitment strategies between symptomatic and asymptomatic office workers. These results implied that symptomatic individuals had altered motor control, which may have important implications in understanding the etiology of work-related musculoskeletal disorders.
URI: http://hdl.handle.net/10397/20981
ISSN: 1050-6411
EISSN: 1873-5711
DOI: 10.1016/j.jelekin.2005.06.004
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