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Effects of Box Color and Precision Demand on the Muscles' Recruitment Pattern in Repetitive Lifting Tasks  

Song, Young-Woong (Department of Occupational Health, Catholic University of Daegu)
Lee, Wook-Gee (Department of Industrial Management, Kumoh National Institute of Technology)
Kim, Sang-Ho (Department of Industrial & Systems Engineering, Kumoh National Institute of Technology)
Publication Information
Journal of the Korea Safety Management & Science / v.11, no.3, 2009 , pp. 79-85 More about this Journal
Abstract
In this study, the effects of psychosocial stress (box color and precision demand) on muscle activity were evaluated in laboratory setting. Eight subjects performed sagittally symmetric lifting tasks. Box color (yellow, black), precision demand (yes, no), and box weight (5%MVC, 10%MVC, 15 %MVC) were varied and surface EMG signals from seven muscles(medial deltoid right, biceps brachii right, lateral triceps right, latissimus dorsi right, erector spinae right, external oblique right, internal oblique right) were recorded. EMG signals were band-pass filtered($10{\sim}400\;Hz$), rectified, RMS smoothed and normalized (NEMG). Analysis of variance tests were conducted on the total NEMG (TNEMG: the sum of the seven muscles' NEMGs) and on the individual muscle's NEMGs. Box color had no effect on the TNEMG and on the seven muscles activities(p>0.05). When precision demand was required at the end point of lifts, the mean NEMG showed higher values than no precision demand conditions: TNEMG (14% increase) and medial deltoid(40% increase), biceps brachii(10% increase), lateral triceps(26% increase), latissimus dorsi(25% increase) muscles. Those increases showed more conspicuous as the box weight increased in the muscles of medial deltoid, lateral triceps, and latissimus dorsi.
Keywords
Musculoskeletal Disorders(MSDs); MMH(manual materials handling); Repetitive Lifting Tasks; Psychosocial Risk Factors; Precision Demand; Box Color;
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