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为了科学评价人体站立平衡能力,本文基于混沌系统非线性分析理论,提出了一种新的评价方法。该方法利用运动平台对受试者足底施加前后方向正弦式运动刺激,采用三个加速度传感器固定于受试者肩、髋、膝,采集人体平衡调节的动态数据。通过重构系统的相空间,计算得到受试者不同体段动态数据的最大Lyapunov指数(LLE),用LLE的差值平方和(SSDLLE)作为平衡能力的评价指标。最后用该方法计算了20位受试者的平衡指标,并与传统评价方法的结果进行对比,结果表明SSDLLE较为符合受试者的平衡表现,可以在一定程度上用于评测人体的平衡能力。此外,结果还表明人体各个关节的协调能力决定了平衡能力的优劣;各体段的混沌特性的差异与个体的站立平衡能力是存在相关性的。
In order to scientifically evaluate the human body’s ability to stand balance, this paper proposes a new evaluation method based on the nonlinear analysis theory of chaotic system. The method uses a motion platform to impose a sinusoidal motion stimulus in the forefoot of the subject. Three acceleration sensors are used to fix the subject’s shoulder, hip and knee to collect the dynamic data of human body’s balance regulation. By reconstructing the phase space of the system, the maximum Lyapunov exponent (LLE) of the dynamic data of different body segments of the subjects was calculated, and the balance squareness of the LLE (SSDLLE) was used as the evaluation index of the balance ability. Finally, this method was used to calculate the balance of 20 subjects, and compared with the results of traditional evaluation methods. The results show that SSDLLE is more in line with the balance performance of the subjects, which can be used to evaluate the body’s balance ability to a certain extent. In addition, the results also show that the coordination ability of the various joints of the human body determines the quality of the balance ability. The differences of the chaotic characteristics of each body segment are correlated with the individual’s standing balance ability.