Effect of Joint Angle on Formulation of Perceived Discomfort for the Upper Limb Based on Joint Moment

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  • 関節モーメントに基づく上肢の主観的負担感の定式化における関節角度の影響
  • カンセツ モーメント ニ モトズク ジョウシ ノ シュカンテキ フタンカン ノ ジョウシキカ ニ オケル カンセツ カクド ノ エイキョウ

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Abstract

The present study investigated the effect of joint angle and gender on the relationship between the perceived discomfort and the joint moment of the upper limbs. Five male and five female subjects participated in this experiment. The target joint motions were the shoulder flexion and the elbow flexion. The perceived discomfort scores were measured with different amplitude of joint moment ratio（i.e., relative value to maximum joint moment that subjects can exert）in each of three joint angle levels. The approximation functions for each joint angle and gender were approximated as functions of joint moment ratio by logistic function model. The average absolute errors ranged from 5 to 10％. The maximum sensitivity and inflection point were selected as the parameters of the approximation function, and the effect of joint angle and gender on the history of approximation functions was evaluated by the proposed algorithm that classifies the approximation functions according to the parameters. The result suggested that the joint angle and gender had little effect on the history of approximation function, and the effect of them can be ignored when the relationship between the perceived discomfort and the joint moment ratio is formulated.

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