Influence of Work-Plane-Height during Screw Tightening Work Involving Elevating the Arm on Musculoskeletal Loading,

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  • SUGAMA Atsushi
    Graduate School of System Design, Tokyo Metropolitan University
  • SEO Akihiko
    Faculty of System Design, Tokyo Metropolitan University
  • DOI Kouki
    Faculty of System Design, Tokyo Metropolitan University
  • YAMAGUCHI Mamiko
    Faculty of Technology, Tokyo Metropolitan Institute of Technology

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Other Title
  • 上肢挙上を伴うねじ締め作業時の作業面高が筋骨格系負担に及ぼす影響
  • ジョウシキョジョウ オ トモナウ ネジ シメ サギョウジ ノ サギョウメン コウ ガ キンコッカクケイ フタン ニ オヨボス エイキョウ

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Abstract

In a factory, problems such as static muscle load occur when workers elevate their arm while assembling goods by hand or by using hand tools. This study quantitatively assesses the influence of the work-plane height during screw-tightening work using a manual screwdriver on musculoskeletal load. Ten healthy male subjects were asked to carry out screw-tightening work using a manual screwdriver for four work-plane heights in an experimental apparatus. An analysis of the results from the viewpoint of an electromyogram, maximum joint torque ratio, pushing force, degree of subjective fatigue, and subjective difficulty of manipulation suggests that for a work-plane at eye height, the musculoskeletal load and degree of subjective fatigue are the worst. Therefore, the work-plane height strongly influences the elevation of workers' arms, and in turn, the musculoskeletal load. Moreover, the cervical division of the spinal chord is subjected to considerable fatigue when workers have to bend their head back in cases where the work-plane is above their head.

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