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- 저자 : 추한박(Hanbo Zou) (검색결과 2 건)
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장시간 입식-좌식 작업대 사용 전략에 따른 생체역학적 변화 분석
김슬기(Seulgi Kim),추한박(Hanbo Zou),진상은(Sangeun Jin) 대한인간공학회 2020 대한인간공학회 학술대회논문집 Vol.2020 No.10
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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입식-좌식 작업대의 육체적 및 인지적 작업 부하에 대한 비용-편익 분석 - 통증 유발자를 중심으로
강상현(Sang Hyeon Kang),최지원(Jiwon Choi),추한박(Hanbo Zou),진상은(Sangeun Jin) 대한인간공학회 2020 대한인간공학회 학술대회논문집 Vol.2020 No.10
Objective: The current study aimed to quantify physical and cognitive workload of the low back pain developers (PDs) and non-pain developers (NPDs) under the office working environment in which two natural-unconstrained postures (prolonged sitting, prolonged standing) and two cognitive demand tasks (low cognitive demand task, high cognitive demand task) were tested. Background: Previous studies suggested a possible difference in sit-stand schedules between PDs and NPDs, but they have only focused only on preventing the first occurrence of low back pain. Method: 13 healthy males visited twice on different days for testing prolonged sitting and standing, and were asked to play the Tetris game and perform cognitive tests for 75 minutes. The experimental protocol consisted of five 15 min sessions, and each session had Tetris game (primary task), cognitive tests (secondary task), and dual task. The dependent variables included three cognitive tests and EMG measures, captured every 7 min. Results: PDs exhibited significantly greater peak NEMG (90<SUP>th</SUP> %ile) in abdominal muscles while standing compared to sitting, but there was no difference in NPDs. In addition, executive function in PDs deteriorated under the high cognitive demand conditions compared to NPDs. These findings might provide an evidence that a subjective complaint of pain may interfere with executive function and result in a confliction between motor control and sensory processing. Conclusion: From biomechanical perspective, PDs had a greater physical workload in the standing posture than in the sitting posture, but NPDs had no difference between postures. From perspective of cognitive abilities, PDs degraded executive function under a dual-task scenario as compared to NPDs. Application: The cost-benefit of physical and cognitive workload between PDs and NPDs could be used for leveling continuous static muscle loading and creating sit-stand schedules for various cognitive load.
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