PROBLEM TO BE SOLVED: To provide a gravity center oscillating system which does not slip off from the top of a force plate, and can properly perform a stepping test.SOLUTION: The gravity center oscillating system 100 includes: the force plate 1 which is equipped with a top board 11 and a three-force-component load cell and a data processing apparatus 2 which measures the gravity center movement of a subject S conforming to load data which has been output from the three-force-component load cell. On the top board 11, a stepping motion reference marker 12 is installed. The data processing apparatus 2 includes a CPU which calculates a stepping position related parameter in a plurality of times of stepping motions conforming to the stepping position on the top board 11. The CPU calculates the absolute coordinates of the position where the foot sole has touched at the time of each stepping motion for each foot of the right and left feet with a specified position on the top board 11 as the original point, and performs a stepping position variation calculating process wherein the center position and the variation in the longitudinal and lateral directions of the foot sole grounding positions in the plurality of times of stepping motions are calculated.COPYRIGHT: (C)2011,JPO&INPIT【課題】フォースプレート上から外れることなく、足踏み検査を適正に行うことができる重心動揺システムを提供する。【解決手段】重心動揺システム100は、天板11と三分力ロードセルとを備えるフォースプレート1と、三分力ロードセルから出力された荷重データに基づいて被験者Sの重心移動を測定するデータ処理装置2とを備え、天板11には足踏み動作基準マーカ12が設けられ、データ処理装置2は、天板11上の足踏み位置に基づいて複数回の足踏み動作における足踏み位置関連パラメータを算出するCPUを有し、CPUは、天板11上の所定位置を原点として、左右各々の足毎に、各足踏み動作の際に足裏が接地した位置の絶対座標を算出して、複数回の足踏み動作における足底接地位置の中心位置及び前後左右方向のバラツキを算出する足踏み位置バラツキ算出処理を行う。【選択図】図1
