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Two posture analysis approaches and their application in a modified rapid upper limb assessment evaluation.

Authors
Bao-S; Howard-N; Spielholz-P; Silverstein-B
Source
Ergonomics 2007 Dec; 50(12):2118-2136
NIOSHTIC No.
20033679
Abstract
This paper presents two posture risk quantification methods: first, an event-based method where the most common and the worst postures are estimated in a task; second, a time-based method where posture distributions are calculated from random samples of observed postures in the task. A 'click-on-screen' posture data entry method was developed for the time-based posture analysis method to make the observation process easier and to reduce possible posture categorization bias. Both methods were used to quantify various work posture parameters among a study cohort of 733 subjects from a prospective epidemiological study of upper extremity musculoskeletal disorders. Composite posture indices using a modified Rapid Upper Limb Assessment (RULA) method were also computed using data obtained by the two posture analysis methods. Results showed that both methods were able to distinguish jobs with large differences in certain posture measures. However, they did not produce the same results and could not be used interchangeably. Risk evaluation criteria should be developed, either for specific posture parameters or as a composite index, with a well-defined postural analysis method, so that users can follow exact procedures and obtain comparable results. The event-based method is easy to use and may suit practitioners better, while the time-based method adds more information to the measurement and may suit users who want more detailed information about posture exposure.
Keywords
Epidemiology; Musculoskeletal-system-disorders; Physiology; Muscle-physiology; Muscle-stress; Musculoskeletal-system; Posture; Time-weighted-average-exposure; Biomechanical-modeling; Bionics; Biophysics
Contact
Safety & Health Assessment & Research for Prevention (SHARP) Program, Washington State Department of Labor and Industries, P.O. Box 44330, Olympia, WA 98504, USA
CODEN
ERGOAX
Publication Date
20071201
Document Type
Journal Article
Email Address
baos235@lni.wa.gov
Funding Amount
289069
Funding Type
Cooperative Agreement
Fiscal Year
2008
NTIS Accession No.
NTIS Price
Identifying No.
Cooperative-Agreement-Number-U01-OH-007316
Issue of Publication
12
ISSN
0014-0139
Priority Area
Disease and Injury: Musculoskeletal Disorders of the Upper Extremities
Source Name
Ergonomics
State
WA
Performing Organization
Washington State Department of Labor and Industries
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