本研究的目的為分析腳底壓力分佈和腰部加速度變化之間的關聯性。因此研究發展出以可程式系統晶片(PSoC)為核心之平衡分析系統,可以即時取得腳底壓力分佈腰部加速度變化。量測紀錄人體在步行時,腰部三維的加速度變化和腳底壓力分佈,透過無線藍芽模組即時傳送給電腦端。系統擷取速度與傳輸方面,PSoC系統晶片內部ADC模組取樣率為20KHz,PSoC晶片和電腦端串列傳輸模組傳輸速度為115200bps,在無障礙物的干擾下,傳輸距離可達10公尺。 本研究利用行走、起身、坐下、以及跨越障礙物動作的實驗結果,去驗證腳底壓力分佈和腰部加速度的關聯性,從腳底壓力中心位置(Center of Pressure) 建立腳底壓力位移向量,由腳底壓力分佈計算出腳底壓力中心位置,以每兩點的腳底壓力中心位置建立腳底壓力位移向量,向量大小表示腳底壓力中心位置移動的距離,方向表示腳底壓力中心位置移動的方向,從腰部加速度建立人體位移向量,並以加速規量測水平和垂直的加速度建立人體位移向量,從加速規輸出訊號計算出腰部加速度的變化,X軸輸出訊號代表水平的加速度,Y軸輸出訊號代表垂直的加速度,分析兩位移向量去驗證其關聯性。 本研究量測十位正常人腳底壓力分佈和腰部加速度,分析腳底壓力位移向量、人體位移向量方向和大小的變化,從兩向量方向和大小的關聯性中,驗證腳底壓力分佈和腰部加速度變化之間具高度相關,因此兩者皆可單獨用來分析人體行走時之步態及動態平衡。
The purpose of the study was to analyze plantar pressure distribution in relation to the accelerometer attach to the waist in walking. The system was integrated using an embedded Programmable System on Chip (PSoC) technology to acquire plantar pressure and acceleration at waist in real time. The data can be transferred to PC using Bluetooth module. The sample rate of the devices was 20KHz. The transmission rate of this system is 115200 bps around 10 meters. The study used the data of walking, sitting down, standing up, and striding across a barrier of ten subjects to validate relationship between plantar pressure distribution and acceleration attach to the waist. The displacement vector of plantar pressure is constructed from two consecutive time frames of Center of Pressure (COP). The displacement vector of body is constructed from acceleration data from of waist. The data show that the magnitudes and phases of two vectors were highly correlated. This result has illustrated that either device can be used independently to analyze gait and dynamic balance of walking.