Munroe-Meyer Institute, University of Nebraska Medical Center, USA.
Infant Behav Dev. 2011 Feb;34(1):81-99. doi: 10.1016/j.infbeh.2010.10.001. Epub 2010 Dec 3.
Infant sitting postural sway provides a window into motor development at an early age. The approximate entropy, a measure of randomness, in the postural sway was used to assess developmental delay, as occurs in cerebral palsy. Parameters used for the calculation of approximate entropy were investigated, and approximate entropy of postural sway in early sitting was found to be lower for infants with developmental delay in the anterior-posterior axis, but not in the medial-lateral axis. Spectral analysis showed higher frequency features in the postural sway of early sitting of infants with typical development, suggesting a faster control mechanism is active in infants with typical development as compared to infants with delayed development, perhaps activated by near-fall events.
婴儿坐姿姿势摆动提供了一个早期了解运动发育的窗口。姿势摆动的近似熵，一种衡量随机性的方法，用于评估发育迟缓，如脑瘫。研究了用于计算近似熵的参数，发现在前-后轴上存在发育迟缓的婴儿的坐姿姿势摆动的近似熵较低，但在中-侧轴上没有。频谱分析显示，典型发育的婴儿早期坐姿的姿势摆动具有更高的频率特征，这表明典型发育的婴儿中存在更快的控制机制，与发育迟缓的婴儿相比，这种机制可能是由近乎跌倒事件激活的。
