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이동식 틀비계 작업 시 허리근육 동시수축률 비교를 통한 요추 안정성 분석

Title
이동식 틀비계 작업 시 허리근육 동시수축률 비교를 통한 요추 안정성 분석
Author
성시훈
Advisor(s)
김정룡
Issue Date
2010-02
Publisher
한양대학교
Degree
Master
Abstract
본 연구에서는 이동식 틀비계를 사용한 작업에서 여러 가지 작업환경을 변화시키면서 이에 따른 허리 안정성을 평가하기 위해 근육의 사용량과 동시수축(co-contraction)을 분석한다. 실험에 사용한 작업조건은 작업대 높이(1단, 2단), 안전난간의 유무(설치, 미설치), 작업자의 숙련도(초보자, 숙련자)이다. 이를 위해 건설현장에서 초보자 4명과 숙련자 4명이 실험에 참여한다. 실험결과 작업대가 높을수록, 안전난간 미 설치시 척추 안정성을 유지하기 위한 허리근육 사용량이 증가하면서 동시수축이 발생하는 것을 발견하였다. 또한 숙련도가 낮을수록 근육사용량은 증가했으나 동시수축은 다소 감소하는 것으로 나타났다. 이러한 근육 사용량과 동시수축의 증가는 허리 안정성을 유지시켜 자세의 안정을 취할 수 있게 한다. 그러나 허리안정성이 유지시키기 위한 반복된 동시수축의 발생으로 인해, 척추가 받는 수직응력이 증가하게 되고, 결과적으로 디스크 질환 등의 근골격계 질환이 발생할 가능성이 높아질 수 있다. 향후 근전도 값을 이용한 생체역학 모델이나, 무게중심(center of pressure)분석을 통하여 동적 작업과 다양한 건설작업에서 척추안정성 변화에 대한 논의가 필요할 것이다.; The purpose of this study is to analyze the spine stability by comparing muscle activation in various scaffold working conditions. EMG(electromyography) analysis of the spine muscles during the given tasks has been performed. The independent conditions were two levels of working hight, with/without safety handrail, and two levels of expertise. The corresponding activities of the agonist and antagonist muscles of the spine were simultaneously recorded by using EMG. The spine muscle included the rectus abdominis, external oblique, latissimus dorsi, and erector spinae. As results, a novice worker showed the increased muscle activity while doing the task on the 2nd floor,without the handrail. And expert showed the increase of co-contraction rate while working on the 2nd floor without handrail. Such co-contraction was found to increase the spine stability. However, along with the co-contraction was prolonged, the spine muscle was prone to be fatigued, which could result in musculo-skeletal disorder. The co-contraction observed in this study can be explained such as motor control system's activity to maintain the stability of the spine when workers cognitively recognized the danger of falling or imbalance. This study quantitatively accounted for the biomechanical cause of LBP(low back pain) among workers who have to prevent themselves from falling. It was also found that this phenomenon was signified when there was no facility to ensure the safety. Later, information about the spine stability can be further investigated during working environment requiring motor control skill in addition to musculo-skeletal task.
URI
https://repository.hanyang.ac.kr/handle/20.500.11754/142548http://hanyang.dcollection.net/common/orgView/200000414066
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > DEPARTMENT OF INFORMATION AND INDUSTRIAL ENGINEERING(정보경영공학과) > Theses (Master)
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