Perry J E, Davis B L, Luciano M G
Department of Biomedical Engineering (ND20), Lerner Research Institute, The Cleveland Clinic Foundation, 9500 Euclid Avenue, Cleveland, OH 44195, USA.
J Electromyogr Kinesiol. 2001 Feb;11(1):31-7. doi: 10.1016/s1050-6411(00)00035-3.
Cerebral palsy is a condition that results in varying degrees of functional deficits. The goal of this study was to develop an objective measure of muscle activity during a prescribed voluntary motor task in non-ambulatory children with spastic cerebral palsy. While performing a simultaneous hip/knee flexion task from the supine position, followed by return to the starting position, electromyographic and kinematic data were obtained from the right leg of eight children before and after selective dorsal rhizotomy and compared with eight age-matched controls. The electromyographic and kinematic data were combined to determine for each muscle of interest (tibialis anterior, soleus, vastus lateralis, biceps femoris) the percentage of the movement cycle for which the muscle was acting concentrically, eccentrically, isometrically or was considered inactive. Averaged over the four muscles, isometric activity decreased by 38% post-op and the time the muscles were inactive increased by 37% following surgery. The percentages of concentric and eccentric activity did not differ significantly between pre- and post-op conditions. Post-operatively, the percentage muscle activity patterns of the children with cerebral palsy more closely resembled that of the control children: averaged across all muscles and contraction types, the difference between the control children and the children with cerebral palsy was reduced by 50% following surgery. This measurement technique indicates promise as a method for quantifying muscle activity during voluntary motor tasks in non-ambulatory children with cerebral palsy.
脑瘫是一种导致不同程度功能缺陷的病症。本研究的目的是开发一种客观测量方法，用于评估非行走型痉挛性脑瘫儿童在规定的自主运动任务中的肌肉活动情况。在从仰卧位进行同步髋/膝屈曲任务并回到起始位置的过程中，获取了8名儿童在选择性背根切断术前和术后右腿的肌电图和运动学数据，并与8名年龄匹配的对照组儿童的数据进行比较。将肌电图和运动学数据相结合，以确定每块感兴趣肌肉（胫骨前肌、比目鱼肌、股外侧肌、股二头肌）在运动周期中进行向心、离心、等长收缩或被认为不活动的百分比。在这四块肌肉上进行平均后，术后等长活动减少了38%，术后肌肉不活动的时间增加了37%。术前和术后向心和离心活动的百分比没有显著差异。术后，脑瘫儿童的肌肉活动模式百分比更接近对照组儿童：在所有肌肉和收缩类型上进行平均后，术后脑瘫儿童与对照组儿童之间的差异减少了50%。这种测量技术有望成为一种量化非行走型脑瘫儿童自主运动任务中肌肉活动的方法。
