| Effects of postural and visual stressors on myofascial trigger point development and motor unit rotation during computer work. | |
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MedLine Citation:
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PMID: 20580571 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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Musculoskeletal complaint rates are high among those performing low-level static exertions (LLSEs), such as computer users. However, our understanding of the causal mechanisms is lacking. It was hypothesized that myofascial trigger point (MTrP) development might be one causal mechanism to help explain these complaints and that static postural and visual demands may be contributing factors. Therefore, the purpose of this experiment was to examine MTrP development and the behavior of multiple parts of the trapezius muscle under postural and mental stress (represented by visual stress) conditions during computer work. Twelve subjects (six male and six female) were monitored for MTrP development via expert opinion, subject self-report, and cyclic changes in EMG median frequency across fourteen spatial locations. Results showed that MTrPs developed after one hour of continuous typing, despite the stress condition. Interestingly, both the high postural and high visual stress conditions resulted in significantly fewer median frequency cycles (3.76 and 5.35 cycles, respectively), compared to the baseline low stress condition (6.26 cycles). Lastly, the MTrP location as well as locations more medial to the spine showed significantly fewer cycles than other locations. Findings suggest that MTrPs may be one causal pathway for pain during LLSEs and both postural and visual demands may play a role in muscle activation patterns, perhaps attributing to MTrP development and resultant discomfort. |
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Authors:
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Jeffrey A Hoyle; William S Marras; James E Sheedy; Dennis E Hart |
Publication Detail:
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Type: Journal Article Date: 2010-06-26 |
Journal Detail:
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Title: Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology Volume: 21 ISSN: 1873-5711 ISO Abbreviation: J Electromyogr Kinesiol Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-01-14 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9109125 Medline TA: J Electromyogr Kinesiol Country: England |
Other Details:
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Languages: eng Pagination: 41-8 Citation Subset: IM |
Copyright Information:
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Copyright © 2010 Elsevier Ltd. All rights reserved. |
Affiliation:
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The Ergonomics Center of North Carolina, Edward P. Fitts Department of Industrial and Systems Engineering, North Carolina State University, 3701 Neil St., Raleigh, NC 27607, USA. hoyle@TheErgonomicsCenter.com |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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