Wu Yunfeng, Zhong Zhangting, Lu Meng, He Jia
Department of Communication Engineering, School of Information Science and Technology, Xiamen University, 422 Si Ming South Road, Xiamen, Fujian 361005, China.
Annu Int Conf IEEE Eng Med Biol Soc. 2011;2011:1652-5. doi: 10.1109/IEMBS.2011.6090476.
Analysis of gait patterns in children is useful for the study of maturation of locomotor control. In this paper, we utilized the Parzen-window method to estimate the probability density functions (PDFs) of the stride interval for 50 children. With the estimated PDFs, the statistical measures, i.e., averaged stride interval (ASI), variation of stride interval (VSI), PDF skewness (SK), and PDF kurtosis (KU), were computed for the gait maturation in three age groups (aged 3-5 years, 6-8 years, and 10-14 years) of young children. The results indicated that the ASI and VSI values are significantly different between the three age groups. The VSI is decreased rapidly until 8 years of age, and then continues to be decreased at a slower rate. The SK values of the PDFs for all of the three age groups are positive, which shows a slight imbalance in the stride interval distribution within each age group. In addition, the decrease of the KU values of the PDFs is age-dependent, which suggests the effects of the musculo-skeletal growth on the gait maturation in young children.
分析儿童的步态模式对于研究运动控制的成熟过程很有用。在本文中，我们利用Parzen窗方法估计了50名儿童步幅间隔的概率密度函数（PDF）。利用估计出的PDF，计算了三个年龄组（3至5岁、6至8岁和10至14岁）幼儿步态成熟的统计量，即平均步幅间隔（ASI）、步幅间隔变化（VSI）、PDF偏度（SK）和PDF峰度（KU）。结果表明，三个年龄组之间的ASI和VSI值存在显著差异。VSI在8岁之前迅速下降，然后以较慢的速度继续下降。所有三个年龄组的PDF的SK值均为正，这表明每个年龄组内步幅间隔分布略有不平衡。此外，PDF的KU值的下降与年龄有关，这表明肌肉骨骼生长对幼儿步态成熟的影响。
