복합 기울임 좌판(Multi-tilting Seatpan) 의자의 골반 움직임 및 피로도 감소 차이 분석
Analysis of Pelvic Movement and Fatigue Reduction Differences in Chairs with Multi-tilting Seatpan
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연구배경: 본 연구는 착석 시 의자 좌판이 사용자의 신체 움직임에 반응하여 골반과 허리뼈의 운동성을 촉진해 줌으로써 허리의 불편함과 피로감 해소에 도움을 줄 수 있는 복합 기울임(틸팅) 좌판을 장착한 의자를 개발하고 이의 효과를 과학적으로 검증하는 데 목적을 두었다. 연구방법: 본 연구에서 개발한 복합 틸팅좌판은 사용자가 앉았을 때 좌판이 사용자의 움직임에 따라 전후좌우로 반응하도록 하여 허리뼈와 골반의 운동성을 촉진한다. 따라서 장기간 사용했을 때 척추의 활동성 향상에 따른 허리 근육의 긴장완화와 척추 디스크에 가해지는 압력을 감소시켜 허리의 피로와 허리통증을 예방하는데 도움을 줄 수 있는지 평가하였다. 개발한 좌판의 효과성 검증을 위해 표준체형의 남자대학(원)생 10명을 피실험자로 선정하여 동작분석기와 근전계를 활용하여 착석 시 골반 움직임의 변화 측정과 척주 세움근의 활성도를 측정하였다. 연구결과: 개발한 복합 틸팅좌판 의자에 착석 시 골반의 위치 변화에 따른 동작분석 평가결과, 골반의 전후좌우 변위 거리가 고정형 좌판보다 커짐을 보여 허리뼈와 골반의 운동성이 높은 것을 확인하였다. 동작분석과 동시에 수행된 근전계를 활용한 척주 세움근(L5/S1) 활성도 평가결과, 틸팅좌판을 사용한 모든 피험자에게서 사후 중앙주파수 값이 사전 중앙주파수 값보다 높게 측정됨으로써 피로지수가 낮아졌음을 알 수 있었다. 결론: 본 연구에서 개발한 신체 움직임 반응형 복합 틸팅좌판은 착석 시 신체의 움직임에 따라 좌판이 전후좌우 방향으로 반응하여 허리뼈와 골반의 운동성을 촉진함으로써 장시간 앉아서 업무를 보거나 공부하는 학생들의 허리 피로감을 줄여줄 의자로써 활용할 수 있으며 향후 이의 도입과 확산을 위한 추가적인 연구개발의 필요성을 제안한다.
Abstract
Background: The purpose of this study was to develop a chair equipped with a multi-tilting seatpan that can help relieve back discomfort and fatigue by promoting the mobility of the pelvis and lumbar spine and verify its effectiveness scientifically. Methods: The multi-tilting seatpan developed in this study promotes mobility of the lumbar spine by allowing the seatpan to respond to the user's movements. To verify the effectiveness of the developed seatpan, 10 male college students were selected as subjects, and motion analyzers and EMG were used to measure the pelvic movement and erector spinae muscle activity during sitting. Results: As a result of the motion analysis, the developed multi-tilting seatpan chair showed larger displacement distance of the pelvis from front to back and left and right than that of the fixed seatpan, As a result of the spinal(L5/S1) erector muscle activity evaluation using EMG, the fatigue index was lowered as the post-MDF(median frequency) value was measured higher than the pre-MDF value in all subjects while using the multi-tilting seatpan chair. Conclusion: The body movement responsive multi-tilting seatpan developed in this study promoting the mobility of the lumbar spine and pelvis, thereby reducing back fatigue of users who sit for a long time to work or study. It can be used as a chair to reduce and suggests the need for additional research and development for its introduction and spread in the future.
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