Evaluation of Trunk and Neck Workload during Upward-pushing Tasks in the Supine Position

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  • 仰臥位での上方押し作業における体幹部および頭頸部の負担
  • ギョウガイ デ ノ ジョウホウ オシ サギョウ ニ オケル カラダ カンブ オヨビ アタマ ケイブ ノ フタン

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Abstract

This study aims to evaluate the relationship between physical workload and working posture during upward-pushing tasks in the supine position. For this purpose, we evaluated the pressure distribution and physical workload for each body part under various working conditions. For the experiment, subjects had to push each type of material with one hand under various conditions. There were nine total experimental conditions and the material was arranged for each condition. The horizontal distance of the material was set at three different levels (elbow, shoulder, and ear). The height of the material was set at three different levels (60%, 75%, and 90% of the length of the upper limb). We found that subjects assumed an upper-body position with the trunk inclined when the material was set higher. The pressure distribution indicated that the reaction force of the upper-body area was higher at the elbow than at the shoulder and ear levels. The reaction force of the head area was larger at heights of 60% and 90% of the length of the upper limb at elbow level. We found that the neck and trunk load increased when the height of the material was higher. The subjects assumed a posture with the upper-body inclined and the neck flexed forward less at both the level of the shoulder and the ear at a height of 75% of the length of the upper limb. The results of the scores indicated that the most comfortable condition was the height of 75% of the length of the upper limb. For the same conditions, the trunk and neck load were lower in this case than for others heights.

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