直立位姿勢における足開角度と身体動揺との関係に関する研究

概要

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The amount of body sway in upright posture in 21 healthy subjects was observed when foot angle was changed.Feet were positioned at angle of 0°, 30°, 60° or 90°. Body sway was mearsured by the strain gaugeplatform system reported previously. Amount of body sway was equivalent to the degree of the center of gravity. The subjects were examined when their eyes were open for 45 seconds and subsequently, when closed for 45 seconds for each foot angle.The results were as follows:1) The body sway at 0° or 90° was greater significantly than at 30° or 60°. Lateral sway at 0° and frontback sway at 90° were remarkably great, regardless of whether the subjects had their eyes open or not.2) When the subjects eyes were closed, body sway increased significantly for all foot angle positions. Sway wave-length increments were dominant in the middle frequency band of approximately 0.3Hz. Here, the degree of increment of both lateral and front-back sway at 0° and that for front-back sway at 90° was greater than that at 30° and 60° respectively.3) No significant differences were observed based on foot angle for the time required to obtain the increment or for that required for postual adaptation.