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논문 기본 정보

자료유형
학술대회자료
저자정보
김슬기 (부산대학교) 추한박 (부산대학교) 진상은 (부산대학교)
저널정보
대한인간공학회 대한인간공학회 학술대회논문집 2020 대한인간공학회 추계학술대회
발행연도
2020.10
수록면
15 - 18 (4page)

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초록· 키워드

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Objective: This study investigated the changes of muscle activation and body kinematics while using dynamic sitting and sit-standing workstation. Background: Although the sit-standing workstation and dynamic sitting strategy environment are an effective way to reduce the biomechanical loads in prolonged static posture, there have been no studies comparing the two conditions for prolonged scenario. Method: A total of 12 healthy participants were recruited and asked to change postures in every 15 minutes (total 60 minutes), while using a computer without any restriction. Each participant visited twice to test ‘sit-semi standing’ (dynamic sitting) and ‘sit-standing’ conditions. Muscle activation was measured in lumbar elector spinae(LES), rectus abdominis(RA), and gluteus maximus(GM), and the center of pressure(CoP) was captured by a forceplate and used to calculate standard deviation in M-L direction and A-P direction, and sample entropy. The body kinematic was captured by a motion capture system and used to calculated lumbar flexion angle. Results: LES showed significant differences in 10, 50, and 90%ile NEMGs in which the "sit-standing" showed greater activation patterns than in "sit-semi standing". In addition, the ‘sit-standing’ condition showed a broader distribution of NEMG than the ‘sit-semi standing’ condition denoting unexpected motions in the standing workstation. GM showed a significant interaction between Conditions and Time in 10, 50, and 90%iles NEMGs, and revealed significantly greater muscle activation in "sit-standing" than in "sit-semi standing". In addition, the movement of CoP was significantly bigger in "sit-standing" than "sit-semi standing", but complexity of movement captured by the sample entropy was significantly smaller in "sit-standing" revealing a simple and patterned movement but bigger movement in the ‘sit-standing’ condition. Conclusion: ‘Sit-semi standing’ showed more positive biomechanical evidences than ‘sit-standing’ for reducing the discomfort of the body in an office environment. Application: The office chair should be designed for providing various sitting postures including ‘semi-standing’ in which a larger trunk-knee angle and a smaller knee angle are required.

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ABSTRACT
1. Introduction
2. Method
3. Results and Discussion
4. Conclusion
References

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