Department of Industrial Engineering and Management, Ming Chi University of Technology, New Taipei City 243, Taiwan.
Arch Gerontol Geriatr. 2012 Nov-Dec;55(3):673-6. doi: 10.1016/j.archger.2011.11.008. Epub 2011 Dec 12.
Falls are a common and devastating problem among elderly people. In a previous study, vibratory insoles were developed to improve postural stability for elderly fallers. To verify the effects of vibratory insoles, a two-stage experiment was conducted to collect center of pressure (COP) signals from 26 elderly fallers and 16 healthy young subjects while standing still. The DFA is used to analyze the behavior of different time-series data obtained from the trajectory of COP. Postural stability was compared by the DFA scaling exponent between a control condition (before using vibratory insoles) and a vibration condition (after using vibratory insoles). For elderly fallers, DFA scaling exponents 95% confidence interval were [1.434, 1.547] and [1.329, 1.451] under control and vibration conditions in the anteroposterior (AP) direction, respectively. The experimental results revealed that temporary stimuli of appropriate amplitude produced by vibration insoles enhanced postural stability in elderly fallers and was more obvious in the AP direction.
跌倒在老年人中是一个常见且严重的问题。在之前的研究中，开发了振动鞋垫来改善老年人跌倒者的姿势稳定性。为了验证振动鞋垫的效果，进行了两阶段实验，从 26 名老年跌倒者和 16 名健康年轻受试者在静止站立时收集了中心压力（COP）信号。使用 DFA 分析从 COP 轨迹获得的不同时间序列数据的行为。通过在控制条件（使用振动鞋垫之前）和振动条件（使用振动鞋垫之后）之间的 DFA 标度指数来比较姿势稳定性。对于老年跌倒者，在前后（AP）方向上，控制条件和振动条件下的 DFA 标度指数 95％置信区间分别为[1.434, 1.547]和[1.329, 1.451]。实验结果表明，振动鞋垫产生的适当幅度的临时刺激增强了老年跌倒者的姿势稳定性，在 AP 方向上更为明显。
