들기작업시 답단의 높이와 발목간 거리가 최대발휘근력에 미치는 영향에 관한 연구

Abstract

Despite most of tasks in manufacturing, construction and agriculture, etc., were currently mechanized and automated, manual materials handling still existed in atypical working condition. In case of manual materials handling, repetitive work, inappropriate working posture, excessive force, contact stress might cause overload, which could lead to work-related musculoskeletal disorders and low back pains. The objective of this study was to reveal the effects of various lifting postures of height of stair and distance between ankles on maximum voluntary contraction(MVC) and to provide scientific data for establishing safety standard for Korean workers. Forty-four subjects were recruited from a university population. The experiment was designed by a combination of three height of stair (0cm, 10cm, 20cm) and three distance between ankles(0cm, 25cm, 50cm). The results of MVC was decreased according to the change of working posture. Also, Interaction between height of stair and distance between ankles was revealed. This study indicaed that the lifting in unbalanced posture of lower body affects the MVC and a physical work load. Therefore, appropriate safety standards for the lifting in unbalanced posture of lower body are needed.