Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/26800
Title: The effects of speed and force of keyboard operation on neck-shoulder muscle activities in symptomatic and asymptomatic office workers
Authors: Szeto, GPY 
Straker, LM
O'Sullivan, PB
Keywords: Computer use
Electromyography
Motor control
Office ergonomics
Physical stressors
Work-related neck and upper limb disorders
Issue Date: 2005
Publisher: Elsevier
Source: International journal of industrial ergonomics, 2005, v. 35, no. 5, p. 429-444 How to cite?
Journal: International journal of industrial ergonomics 
Abstract: The study compared the EMG changes and discomforts experienced by a symptomatic and an asymptomatic group of office workers when they were challenged by the physical stressors of increased typing speed and increased typing force. 21 female office workers were recruited in the Case Group and 20 in the Control Group. Each subject had to perform 20 min of typing in 3 conditions: Normal, Faster and Harder; which described the requirement to work with normal speed and force, faster speed and harder force, respectively. The Case Group showed trends for higher muscle activities in all three conditions in both the upper trapezius and cervical erector spinae muscles. On the whole, there were greater increases in muscle activities in both groups under the Faster condition, implying that increasing the typing speed was a more difficult demand. When the Case subjects were sub-divided into High and Low (Discomfort) Groups, greater differences in muscle activities were revealed. It was mainly the High Group that showed the greatest changes in terms of muscle activities and discomforts. The Low Group showed moderate increases in discomforts and muscle activities, while the Control Group showed minimal changes in both. The results supported the "Altered Motor Control" model in the symptomatic individuals who may also have developed a "heightened sensitivity" to physical stressors due to their prolonged history of discomforts in the past.
URI: http://hdl.handle.net/10397/26800
ISSN: 0169-8141
EISSN: 1872-8219
DOI: 10.1016/j.ergon.2004.10.009
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