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Cross-sectional study of upper trapezius muscle activity and self-reported neck/shoulder pain.

Authors
Fethke-NB; Gerr-F; Anton-DC; Cavanaugh-JE; Cook-TM
Source
Proceedings of the Human Factors and Ergonomics Society 51st Annual Meeting, October 1-5, 2007, Baltimore, Maryland. Santa Monica, CA: Human Factors and Ergonomics Society, 2007 Oct; 51(15):962-966
NIOSHTIC No.
20040647
Abstract
The purpose of this crosssectional study was to compare the observed associations between upper trapezius muscle activity, as estimated with several summary measures obtained from surface electromyography (EMG), and selfreported neck/shoulder pain among a sample of 231 manufacturing workers. EMG methods used in this study included mean rootmeansquare amplitude, the amplitude probability distribution function (APDF), EMG gaps analysis, and clustered exposure variation analysis. The observed sevenday prevalence of neck/shoulder pain was 13.9%. Of the EMG summary measures, only the 90 th percentile of the APDF was significantly associated with symptoms, with crude and adjusted odds ratios of 2.57 (1.026.49) and 2.78 (1.077.21) per natural log unit, respectively. This study was largely inconclusive due to the similarity in the distributions of the summary measures between symptomatic and nonsymptomatic participants, and explicit measures of posture and repetition may produce stronger associations with symptoms.
Keywords
Muscles; Musculoskeletal-system; Musculoskeletal-system-disorders; Muscle-function; Workers; Neck-injuries; Posture; Repetitive-work; Physiological-function; Cumulative-trauma; Cumulative-trauma-disorders
CODEN
PHFSDQ
Publication Date
20071001
Document Type
Conference/Symposia Proceedings
Funding Type
Grant
Fiscal Year
2008
NTIS Accession No.
NTIS Price
ISBN No.
9788945289308
Identifying No.
Grant-Number-R01-OH-007945; Grant-Number-T42-OH-008491
Issue of Publication
15
ISSN
1071-1813
Source Name
Proceedings of the Human Factors and Ergonomics Society 51st Annual Meeting, October 1-5, 2007, Baltimore, Maryland
State
IA
Performing Organization
University of Iowa - Iowa City
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