Muscle responses to seated perturbations for typically developing infants and those at risk for motor delays.
Muscle responses to seated perturbations for typically developing infants and those at risk for motor delays.
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正常发育的婴儿和有运动迟缓风险的婴儿对坐姿扰动的肌肉反应。
DOI：
10.1017/s0012162204001148
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发表时间：
2004
影响因子：
3.8
通讯作者：
Kartin,Deborah
中科院分区：
文献类型：
--
作者：
Washington,Kathleen;Shumway-Cook,Anne;Price,Robert;Ciol,Marcia;Kartin,Deborah
本研究考察了典型发育（TD）婴儿和有持续神经运动迟缓风险的婴儿在座位前平台扰动下肌肉活动的空间和时间组织。12名8 ~ 10月龄（校正早产）的高危（HR）婴儿（6男6女）和12名TD婴儿（9男3女），均为独立保姆。体表肌电图记录了颈部、躯干和腿部肌肉对向前扰动的反应（6cm振幅，12cm/s）。中心压力测量也被记录。TD婴儿明显比HR婴儿表现出更多的相位反应，HR婴儿有更多的强直性活动试验和更多的无肌肉活动爆发试验（Mann-Whitney U检验，双尾，p=0.006）。与HR婴儿相比，TD婴儿表现出更多的指向合适的尾状脑供血模式。两组之间有一些相似之处，在任何压力中心测量或发病潜伏期之间均无显著差异。结果表明，运动迟缓的HR婴儿的姿势发育是复杂的。坐姿控制的某些要素似乎是发育适宜的，例如，在以尾脑模式排列的方向适宜的肌肉中存在相活动。然而，这些与年龄相适应的反应的频率在HR婴儿中明显较低，他们表现出许多正常的，尽管不成熟的反应，如头尾顺序的肌肉活动。
This study examined spatial and temporal organization of muscle activity in response to seated forward platform perturbations in typically developing (TD) infants and in infants at risk for ongoing neuromotor delays. Twelve high-risk (HR) infants (six males, six females) and 12 TD infants (nine males, three females) aged 8 to 10 months (corrected for prematurity), who were all independent sitters, participated in this study. Surface electromyograms recorded muscle responses to forward perturbation in the neck, trunk, and leg (6cm amplitude, 12cm/s). Center of pressure measures were also recorded. The TD infants demonstrated significantly more phasic responses than the HR infants, who had more trials with tonic activity and more trials with no burst of muscle activity (Mann–Whitney U test, two-tailed, p=0.006). The TD infants demonstrated caudalcephalo, directionally appropriate recruitment patterns more often than the HR infants. There were some similarities between the two groups, with no significant difference between any of the center of pressure measures or onset latencies. Results suggest that postural development in HR infants with motor delays is complex. Some elements of seated postural control appear to be developmentally appropriate, e.g. presence of phasic activity in directionally appropriate muscles sequenced in a caudalcephalo pattern. However, frequency of these age appropriate responses was significantly lower in HR infants, who demonstrated many normal, albeit immature, responses, such as cephalocaudally sequenced muscle activity.