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Application of the Strain Index in multiple task jobs.

Authors
Bao-S; Spielholz-P; Howard-N; Silverstein-B
Source
Appl Ergon 2009 Jan; 40(1):56-68
NIOSHTIC No.
20034913
Abstract
Six different methods to calculate the Strain Index (SI) scores for jobs with multiple forces/tasks were developed. Exposure data of 733 subjects from 12 different worksites were used to calculate these SI scores. Results show that using different SI computation methods could result in different SI scores, hence different risk level classifications. However, some simpler methods generated SI scores were comparable to the more complicated composite SI method. Despite differences in the scores between the six different SI computation methods, Spearman rank-order correlation coefficients of 0.61-0.97 were found between the methods. With some confidence, ergonomic practitioners may use simpler methods, depending on their specificity requirement in job evaluations and available resources. Some SI computation methods may tend to over-estimate job risk levels, while others may tend to under-estimate job risk levels, due to different ways used in obtaining the various SI parameters and computations.
Keywords
Mathematical-models; Risk-analysis; Job-stress; Safety-practices; Workplace-studies; Work-environment; Stress; Author Keywords: Upper arm musculoskeletal disorders; Exposure quantification; Job evaluation
Contact
Stephen Bao, Safety and Health Assessment and Research for Prevention (SHARP) Program, Washington State Department of Labor and Industries, P.O. Box 44330, Olympia, WA 98504
CODEN
AERGBW
Publication Date
20090101
Document Type
Journal Article
Email Address
baos235@lni.wa.gov
Funding Amount
289069
Funding Type
Cooperative Agreement
Fiscal Year
2009
NTIS Accession No.
NTIS Price
Identifying No.
Cooperative-Agreement-Number-U01-OH-007316
Issue of Publication
1
ISSN
0003-6870
Priority Area
Disease and Injury: Musculoskeletal Disorders of the Upper Extremities
Source Name
Applied Ergonomics
State
WA
Performing Organization
Washington State Department of Labor and Industries
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