Chen Jessie, Woollacott Marjorie H
Department of Physiology and Neuroscience, New York University School of Medicine, Eugene, OR 97403, USA.
J Mot Behav. 2007 Jul;39(4):306-16. doi: 10.3200/JMBR.39.4.306-316.
The authors examined and compared the effect of support-surface perturbations of various magnitudes on lower extremity kinetics of 7 children with cerebral palsy (CP) and 8 typically developing (TD) children. Results showed that the highest velocity tolerated without stepping was slower in children with CP than in either age-matched TD or younger TD children. Multimodal torque profiles were more frequent in children with CP than in TD controls. TD groups temporally and spatially organized torque activation, whereas children with CP activated all joints simultaneously and showed altered torque contribution patterns among joints. Those results suggest that impairments in reactive postural control in children with CP result not only from developmental delay but also from pathology. Evidence for pathology included increased numbers of torque bursts required to regain stability and less efficient temporal and spatial organization of torque activation patterns.
作者研究并比较了不同幅度的支撑面扰动对7名脑瘫（CP）儿童和8名发育正常（TD）儿童下肢动力学的影响。结果表明，不迈步情况下能耐受的最高速度，脑瘫儿童比年龄匹配的发育正常儿童或年龄更小的发育正常儿童要慢。与发育正常的对照组相比，脑瘫儿童多模式扭矩曲线更为常见。发育正常组在时间和空间上组织扭矩激活，而脑瘫儿童同时激活所有关节，并在关节间表现出扭矩贡献模式的改变。这些结果表明，脑瘫儿童反应性姿势控制受损不仅源于发育迟缓，还源于病理因素。病理证据包括恢复稳定所需的扭矩爆发次数增加，以及扭矩激活模式的时间和空间组织效率较低。
