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Effect of various work factors on push-pull strength and muscle recruitment pattern  

심정훈 (동아대학교 산업시스템공학과)
이상도 (동아대학교 산업시스템공학과)
Publication Information
Journal of Korean Society of Industrial and Systems Engineering / v.25, no.4, 2002 , pp. 46-53 More about this Journal
Abstract
Push-pull strength has been found to be associated with various work factors such as height, distance, repetition, duration, posture and individual factors. Therefore, this study was performed to investigate the effect of various work factors on push-pull strength and muscle recruitment pattern. Work factors were consisted of grip height(elbow, shoulder), grip distance(100%, 50%, and 25% of maximum grip distance) and shoulder angle(neutral($90^{\cire}$), and abduction($45^{\cire}$, $0^{\cire}$)) during sitting work. The results showed that the normalized strength and EMG value were higher at the elbow height than the shoulder height, and increased with grip distance and shoulder adduction. The results of ANOVA showed that there was significant difference on muscle recruitment patterns among the task conditions. Therefore, it is necessary to consider work factors as well as strength to prevent workers from work-related injuries.
Keywords
push-pull strength; EMG, grip height; grip distance; shoulder angle;
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