Effect of work pace on biomechanical exposure in a short-cycle repetitive pick-and-place task
2016 (English)In: Annals of Occupational Hygiene, ISSN 0003-4878, E-ISSN 1475-3162Article in journal (Refereed) Accepted
Aim: This study investigated the extent to which controlled changes in work pace in a short-cycle pick-and-place task influenced upper extremity biomechanical exposure. Methods: Thirteen subjects performed the task at five work paces ranging from MTM-90 to MTM-135, and in two experimental conditions where the hand was moved horizontally with an average upper arm elevation of 30° and 50°, respectively. Results: A 50% increase in work pace at an arm elevation of 30° resulted in significant increases in within-cycle variation of upper arm elevation angle, cycle-to-cycle variability of the average angle, angular peak velocity, and cycle-to-cycle variability of peak velocity. However, only angular peak velocity showed a consistent stepwise increase throughout the entire range of paces, while other effects were inconsistent. Average muscle activity of both the trapezius and the deltoid increased consistently with pace, as the only variables addressing muscle activity. These associations between work pace and exposure did not change with working height. Conclusion: The present study gives a more comprehensive documentation of pace effects on biomechanical exposure than any previous study. We encourage more investigations on the effect of work pace on biomechanical exposure, including whether work pace is a concern with regard to the development of musculoskeletal disorders.
Place, publisher, year, edition, pages
work pace, muscle activity, motor variability, upper arm elevation
Environmental Health and Occupational Health
IdentifiersURN: urn:nbn:se:hig:diva-21507OAI: oai:DiVA.org:hig-21507DiVA: diva2:929572