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In this paper, we examine the anxiety at utilization of wheelchairs. When the human use wheelchairs, from the influence of environment, the human feel a sense of unease. In particular, when the human go down slopes using wheelchairs, the human feel a sense of unease. The sense of unease is under influence of the organ of vision and the vestibular organ. In this paper, when the human go down slopes using wheelchairs and the influence of the organ of vision is eliminated, whether or not, the declivity angle for human to feel the anxiety can be estimated. It is clarified that the declivity angle for human to feel the anxiety can be estimated with relatively high accuracy.

Estimation of a Declivity Angle for Human to Feel the Anxiety in the Case of Going Down Slopes using Wheelchair