[in Japanese]

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[in Japanese]

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[in Japanese]

View full abstract

[in Japanese]

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[in Japanese]

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[in Japanese]

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This study focused on the features of the perceived foot heights which could be a factor of the risk of tripping during walking. We measured and evaluate the errors between the perceived foot heights and actual foot heights. Ten young adults, whose lower visual fields were occluded, were asked to adjust their toe height to the height of the target test-piece that placed on the floor 3[m] ahead of them. Once they felt that their toe height was appropriately matched to the target height, the distance between their toe and the target height was measured, and compared the constant errors among the conditions (height of the test-pieces and dominant limb). The amount of the constant error tended to increase in negative direction. Moreover, such features were consistent with the features of the joint position senses that reported previously. These results indicate that as the participants raise their toe higher, the heights of their toe tend to become lower than they expected.

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The purpose of this study is to identify the effects on physical ability among the people who are doing physical activities constantly. This study was done by a 8-year-follow-upresearch which examined 8 middle- aged people, who had done physical exercises often, by comparing the changes of their high speed motion test before and after 8 years. The tests included analysis of motion in 15-second stationary step motions and muscle strength measurements of hip flexion in sitting position. The motions of 8 middle aged subjects were videotaped with a video camera operating at 60 Hz. The changes of perpendicular displacements, step rate, velocity, and coefficient of variation in the stepping motions were calculated and a comparative study was done between now and 8 years ago. Only little change could be found in body weight both men and women, which shows that constant and periodical exercises could prevent them from becoming obesity. Muscle strength increased in most of the subjects, and it is only a small gap among those whose muscular strength decreased compared with 8 years ago. Although step rate of the stepping motions was slightly decreased, perpendicular displacement in its motion was significantly increased. Velocity of leg motion in 5 of the subjects was increased. Spatial stability of motion in the stepping motions was significantly improved in most of the subjects. And also, time stability of motion in some of the subjects was improved. According to this study, it was suggested that constant and periodical sport activities could improve as well as maintain velocity and stability of motion of body movements.

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In order to consider visual inspection utilizing peripheral vision, this paper examines the inspection times that affect defect detection. The gaze duration and the distance between defect and point of gaze are experimental factors in determining the inspection time. As the result, in case of a large sized defect, the detection rate is high regardless of the gaze duration and the distance between defect and point of gaze. In case of a small sized defect, when the gaze duration is longer and the distance between defect and point of gaze is closer, the defect detection rate is higher. Moreover, as the result of conducting multiple linear regression analysis about the experiment factors, it is obtained that judging from standardized partial regression coefficient of factors, higher defect size, less the distance between defect and point of gaze, higher gaze duration, is proved to improve defect detection.

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