日常生活動作の画像解析

抄録

We previously investigated disabilities in daily living in patients with unilateral vestibular disorders. The largest number of patients reported difficulty in pulling on their pants or skirt while standing on one leg. Many patients also answered that they felt unstable when turning their head while standing or walking. However, it has been difficult to detect their disability using current methods such as electronystagmography, stabilometry and so on.
The purpose of this research was to develop a motion analysis system to detect the effects of vertigo on activities of daily living. Sixteen healthy subjects, 7 males and 9 females, took part in this study. Fluorescent markers were attached to the subject's head, shoulder, elbow and greater trochanter. The chair that the subjects were sitting on was rotated for 10 seconds to induce vertigo. The seven females went through the motions of pulling on a skirt before and after stimulation. These motions were recorded by CCD camera and each position of the body was calculated and stored on the hard disk of the computer. The angle between shoulder line and a horizontal line on the monitor was measured. Two other females and 7 males looked behind themselves before and after stimulation. The degree of each fluorescent marker's rotation around the vertical axis was estimated from the distance of movement of the head, shoulder and elbow.
In both of the motions, the effects of vertigo could be clearly observed. From our experiments, we suggested that motion analysis is a useful method for detecting disa-bility in the activities of daily living of patients with vertigo.