Journal of the Ergonomics Society of Korea (대한인간공학회지)

Ergonomics Society of Korea (대한인간공학회)
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Effects of Wrist Position on Electromyographic Activities of Flexor Digitorum Superficials and Extensor Digitorum during Drilling and Pinch Grip

드릴작업과 집기작업 시 손목 자세가 손가락굽힘근과 손가락폄근의 근 활성도에 미치는 영향

  • Choi, Ji-Woo (Korea Occupational Safety & Health Agency, Safety & Health team, KOSHA) ;
  • Jeon, Hye-Seon (Department of Ergonomic Therapy, Graduate School of Health and Environment, Yonsei University) ;
  • Oh, Yun-Kwon (Department of Ergonomic Therapy, Graduate School of Health and Environment, Yonsei University) ;
  • Yi, Chung-Hwi (Department of Ergonomic Therapy, Graduate School of Health and Environment, Yonsei University)
  • 최지우 (한국산업안전공단 안전보건팀) ;
  • 전혜선 (연세대학교 보건환경대학원 인간공학치료학과) ;
  • 권오윤 (연세대학교 보건환경대학원 인간공학치료학과) ;
  • 이충휘 (연세대학교 보건환경대학원 인간공학치료학과)
  • Published : 2007.08.31
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Abstract

The purpose of this study was to investigate influence of wrist position on the electromyographic(EMG) activities of the flexor digitorum superficialis (FDS) and extensor digitorum (ED) during drilling and pinch grip. Eighteen healthy subjects had been recruited and each subject performed two tasks (drilling and pinch grip) at three different wrist positions ($30^{\circ}$ flexion, neutral, $30^{\circ}$ extension). The EMG amplitude of each muscle was normalized to the amplitude in the maximal voluntary contraction (MVC). Repeated one-way ANOVA was used to compare the differences of EMG across wrist positions. The FDS EMG activity in both drilling and pinch grip was lowest at $30^{\circ}$ wrist extension and the highest at $30^{\circ}$ wrist flexion. The ED EMG activity was lowest when the wrist was neutral in both tasks. From the results of this study, we can conclude that the desirable wrist positions for drilling and pinch grip tasks are slightly extended or neutral position. Therefore, flexed wrist position should be avoided to reduce the excessive work load on the finger muscles during the tasks.

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References

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