Yamagata Prefectural University of Health Sciences, 260 Kamiyanagi, Yamagata, Yamagata 990-2212, Japan.
Gait Posture. 2012 Feb;35(2):308-11. doi: 10.1016/j.gaitpost.2011.09.106. Epub 2011 Oct 22.
Stance instability is seen in late stage Parkinson's disease (PD). Stabilometer-based center-of-pressure (COP) evaluation is an easy, routine method for measuring postural control ability. Most of the stabilometer- and force plate-based studies on upright postural control have discussed horizontal COP component control. Previous studies on vertical component control have been few, and no fractal analysis-based study on the component has been reported. We aimed to show the influence of neurological changes and aging on the vertical component and the difference in fluctuation pattern behavior in healthy young and elderly subjects as well as Parkinsonian patients. Detrended fluctuation analysis was used to study characteristics of fluctuation of vertical ground reaction force. In the three groups, all scaling exponents (α, α1, α2), which are time-correlated data of vertical ground reaction force, had a value >0 and <0.5 (0<α<0.5). Additionally, α and α2 were significantly different between PD and the other groups. Significant differences were observed between PD and the other groups regarding RMS, maximum peak value, and coefficient of variance. We demonstrated statistically significant differences in vertical ground reaction force between Parkinsonian patients and the other groups, suggesting that a neurological influence with PD may be markedly reflected in the vertical ground reaction force.
姿势不稳可见于帕金森病（PD）晚期。基于平衡仪的压力中心（COP）评估是一种简单、常规的测量姿势控制能力的方法。大多数基于平衡仪和测力板的直立姿势控制研究都讨论了水平 COP 分量控制。关于垂直分量控制的先前研究较少，并且没有基于分形分析的研究报告。我们旨在展示神经变化和衰老对垂直分量的影响，以及健康年轻和老年受试者以及帕金森病患者之间波动模式行为的差异。去趋势波动分析用于研究垂直地面反力波动的特征。在三组中，所有标度指数（α、α1、α2），即垂直地面反力的时间相关数据，均具有值>0 且<0.5（0<α<0.5）。此外，α 和α2 在 PD 组与其他组之间存在显著差异。PD 组与其他组之间在 RMS、最大峰值和变异系数方面存在显著差异。我们证明了帕金森病患者与其他组之间的垂直地面反力存在统计学上的显著差异，这表明 PD 中的神经影响可能在垂直地面反力中得到明显反映。
