산업경영시스템학회지 (Journal of Korean Society of Industrial and Systems Engineering)

  • 제37권4호
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  • Pages.72-81
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  • 2014
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  • 2005-0461(pISSN)
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  • 2287-7975(eISSN)
한국산업경영시스템학회 (Society of Korea Industrial and System Engineering)
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한 손 들기 작업과 내리기 작업의 요추부위(L5/S1) 부하에 대한 비교 연구

Comparison of Biomechanical Stress on Low Back(L5/S1) for One-hand Lifting and Lowering Activity

  • 김홍기 (경기대학교 공과대학 산업경영공학과)
  • Kim, Hong-Ki (Department of Industrial and Management Engineering, Kyonggi University)
  • 투고 : 2014.09.18
  • 심사 : 2014.10.20
  • 발행 : 2014.12.31
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초록

Even though two-hands lifting/lowering activity of manual materials handling tasks are prevalent at the industrial site, many manual materials handling tasks which require the worker to perform one-hand lifting/lowering are also very common at the industrial site, forestry, farming, and daily life. The objective of this study was to compare one-hand lowering activity to lifting activity in terms of biomechanical stress for the range of lowering heights from knuckle height to 10cm above floor level with two workload 7.5kg and 15.0kg. Eight male subjects with LMM were asked to perform lifting/lowering tasks using both a one-handed (left-hand and right-hand) as well as a two-handed technique. Spinal loading was estimated through an EMG-assisted free-dynamic biomechanical model. The biomechanical stress of one-hand lowering activity was shown to be 43% lower than that of one-hand lifting activity. It was claimed that the biomechanical stress for one-hand lifting/lowering activity is almost twice (194%) of the one for two-hands lifting/lowering activity. It was also found that biomechanical stress by one-hand lowering/lifting activity with the half workload of two-hands lowering/lifting activity was greater than that of the two-hands lowering/lifting activity. Therefore, it might be a risk to consider the RWL of one-hand lowering/lifting activity to simply be a half of the RWL of two-hands lowering/lifting activity recommended by NIOSH.

키워드

참고문헌

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피인용 문헌

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