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Variability in muscle activity and wrist motion measurements among workers performing non-cyclic work.

Authors
Fethke-NB; Gerr-F; Anton-D; Cavanaugh-JE; Quickel-MT
Source
J Occup Environ Hyg 2012 Jan; 9(1):25-35
NIOSHTIC No.
20040641
Abstract
Appropriate sampling strategies for estimation of exposure to physical risk factors require knowledge of exposure variability over time. Limited information is available about the variability of exposure to physical risk factors for upper extremity musculoskeletal disorders, especially during non-cyclic work activities. We investigated the magnitude and relative contributions of several sources of variance to the total exposure variance among office, custodial, or maintenance workers (N = 5 per group). In addition, we examined the homogeneity of exposure within each group of workers and exposure contrast between groups of workers. Activation of the flexor carpi radialis and upper trapezius muscle groups was assessed with surface electromyography (EMG) and wrist motion was assessed with electrogoniometry. Exposure information was collected continuously over a complete work shift on two occasions. We observed a substantial contribution of the within-day-within-subject variance component to the total exposure variance for all EMG and electrogoniometer summary measures. We also observed limited exposure contrast between the occupational groups in summary measures of upper trapezius EMG and most electrogoniometry summary measures. The large within-day-within-subject variance suggests the need for prolonged measurement durations (e.g., more than 1 hr) in future epidemiologic investigations of associations between exposure to physical risk factors and upper extremity musculoskeletal disorders.
Keywords
Risk-analysis; Risk-factors; Physical-capacity; Physical-reactions; Physiological-effects; Muscle-function; Muscle-physiology; Muscles; Musculoskeletal-system; Musculoskeletal-system-disorders; Employee-exposure; Employee-health; Exposure-assessment; Office-workers; Maintenance-workers; Extremities; Body-mechanics; Body-regions; Electrophysiological-measurements; Electrophysiology; Measurement-equipment; Author Keywords: electrogoniometry; exposure variability; surface electromyography; upper extremity musculoskeletal disorders
Contact
Nathan B. Fethke, Department of Occupational and Environmental Health,College of Public Health,University of Iowa, UI Research Park, 158C IREH, Iowa City, IA 52242
CODEN
JOEHA2
Publication Date
20120101
Document Type
Journal Article
Email Address
nathan-fethke@uiowa.edu
Funding Type
Grant
Fiscal Year
2012
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-T42-OH-008436; B04252012
Issue of Publication
1
ISSN
1545-9624
Source Name
Journal of Occupational and Environmental Hygiene
State
AL; IA; WA; TN
Performing Organization
University of Alabama at Birmingham
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