Analysis of Standing Balance Reaction Using Movable Platform.

TAKAHASHI TETSUYA, AMIMOTO KAZU

doi:10.1589/rika.12.175

The purpose of this study was to determine the standing balance reaction in healthy young and older subjects using a movable platform. The subjects were 20 volunteers in good health; 10 young subjects with a mean age of 24.5 years and 10 older subjects with a mean age of 65.4 years. Each subject stood on a movable platform with their eyes open or closed, as the following three conditions were performed: 1) standing on a stable support surface, 2) toes up and toes down with rotational motions of both support surfaces in the sagittal plane, 3) an upward displacement of the one support surface and downward displacement of the other with lateral rotational motions in the frontal plane.The dispersion, the mean displacement of the center of pressure, and the rate of weight shift were calculated by using the dynamic balance system (CHATTEX). The results were as follows: 1) The dispersion in older subjects was slightly greater than (that) in the young subjects under all conditions, but was not significant. 2) The dispersion with the eyes closed was significantly greater than (that) with the eyes open under all conditions in both groups. 3)With the eyes closed, the standing balance in both groups was affected greater by the stimulation of toes up and down rather than that of upward displacement of one foot up and downward displacement of the other. But standing balance with the eyes open was not affected. These results indicate that the task of toes up and down is more difficult for subjects standing with their eyes closed.

Analysis of Standing Balance Reaction Using Movable Platform.

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