| Examining the low, high and range measures of muscle activity amplitudes in symptomatic and asymptomatic computer users performing typing and mousing tasks. | |
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MedLine Citation:
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PMID: 19255772 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Past studies on work-related musculoskeletal disorders (WMSD) have reported increased median muscle activities in terms of 50th% of amplitude probability distribution function (APDF), and this was thought to be a manifestation of altered motor control--an important mechanism contributing to WMSD. The present study aimed to examine whether such altered motor control was also present in other parameters of APDF--the 10th and 90th% values, which can be considered indicators of the low and high measures of muscle activity. The difference between 10th and 90th% APDF can be considered an indicator of the variation in muscle activity amplitude (the "APDF range"). Surface electromyography was examined in female office workers as Case (n = 21) and Control (n = 18) subjects. The APDF variables were measured in cervical erector spinae (CES) and upper trapezius (UT) muscles during typing, mousing and type-and-mouse, for 20 min each. The Case Group had significantly higher CES activity in the 10th, 90th% and APDF range compared to Controls. The UT muscles showed similar trends but the between-group differences were not statistically significant. These results have demonstrated the robustness of the APDF variables as sensitive indicators of motor control variations in symptomatic subjects with musculoskeletal disorders. |
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Authors:
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Grace P Y Szeto; Leon M Straker; Peter B O'Sullivan |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2009-03-03 |
Journal Detail:
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Title: European journal of applied physiology Volume: 106 ISSN: 1439-6327 ISO Abbreviation: Eur. J. Appl. Physiol. Publication Date: 2009 May |
Date Detail:
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Created Date: 2009-05-01 Completed Date: 2009-08-05 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100954790 Medline TA: Eur J Appl Physiol Country: Germany |
Other Details:
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Languages: eng Pagination: 243-51 Citation Subset: IM |
Affiliation:
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Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hung Hom, Hong Kong. rsgszeto@inet.polyu.edu.hk |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Biomechanics Case-Control Studies Computers Electromyography Female Humans Muscle Contraction / physiology Muscle Fatigue / physiology Muscle, Skeletal / physiopathology* Musculoskeletal Diseases / physiopathology* Neck Muscles / physiology Neck Pain / physiopathology Occupational Diseases / physiopathology* Range of Motion, Articular / physiology |
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