들기작업시 몸통각도와 상완각도가 작업부담에 미치는 영향에 관한 연구

Abstract

Lifting capacity and difficulty of task are influenced by body posture. In RULA and REBA, a body was divided into segments which formed two groups, A and B. Group A includes the upper and lower arm and wrist while group B includes the neck, trunk and legs. This ensures that whole body posture is recorded so that any awkward or constrained posture of the legs, trunk or neck which might influence the posture of the upper limb. This study aimed to measure EMG (electromyography) MVC (maximum voluntary contraction), RWL(Recommended Weight Limit) and subjective judgment in psychophysical method (Borg’s scale) according to trunk and upper arm angle and to analyze results statistically. The results of this study showed that lifting capacity was more influenced by interaction of body posture rather than angles of each part, and MVC variation according to trunk and upper arms angles should be different patterns. This means that we consider the interaction of trunk angles and upper arm angles when we access risk factors of the postures. This survey can also be used as basic data to evaluate difficulty of lifting tasks according to body postures ergonomically.