Affordable Access

deepdyve-link
Publisher Website

The Composite Strain Index (COSI) and Cumulative Strain Index (CUSI): methodologies for quantifying biomechanical stressors for complex tasks and job rotation using the Revised Strain Index.

Authors
  • Garg, Arun1
  • Moore, J Steven2
  • Kapellusch, Jay M1
  • 1 a Department of Occupational Science & Technology , University of Wisconsin - Milwaukee , Milwaukee , WI , USA.
  • 2 b School of Rural Public Health , Texas A&M University , College Station , TX , USA.
Type
Published Article
Journal
Ergonomics
Publication Date
Aug 01, 2017
Volume
60
Issue
8
Pages
1033–1041
Identifiers
DOI: 10.1080/00140139.2016.1246675
PMID: 27734756
Source
Medline
Keywords
License
Unknown

Abstract

The Composite Strain Index (COSI) quantifies biomechanical stressors for complex tasks consisting of exertions at different force levels and/or with different exertion times. The Cumulative Strain Index (CUSI) further integrates biomechanical stressors from different tasks to quantify exposure for the entire work shift. The paper provides methodologies to compute COSI and CUSI along with examples. Complex task simulation produced 169,214 distinct tasks. Use of average, time-weighted average (TWA) and peak force and COSI classified 66.9, 28.2, 100 and 38.9% of tasks as hazardous, respectively. For job rotation the simulation produced 10,920 distinct jobs. TWA COSI, peak task COSI and CUSI classified 36.5, 78.1 and 66.6% jobs as hazardous, respectively. The results suggest that the TWA approach systematically underestimates the biomechanical stressors and peak approach overestimates biomechanical stressors, both at the task and job level. It is believed that the COSI and CUSI partially address these underestimations and overestimations of biomechanical stressors. Practitioner Summary: COSI quantifies exposure when applied hand force and/or duration of that force changes during a task cycle. CUSI integrates physical exposures from job rotation. These should be valuable tools for designing and analysing tasks and job rotation to determine risk of musculoskeletal injuries.

Report this publication

Statistics

Seen <100 times