Gait of a deafferented subject without large myelinated sensory fibers below the neck
Gait of a deafferented subject without large myelinated sensory fibers below the neck
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DOI：
10.1212/wnl.47.1.109
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发表时间：
1996-07-01
期刊：
影响因子：
9.9
通讯作者：
Lamarre, Y
中科院分区：
文献类型：
--
作者：
Lajoie, Y;Teasdale, N;Lamarre, Y
我们评估了一名21年前因单纯感觉神经病变急性发作而导致颈部以下大型感觉有髓纤维永久性缺失的受试者的步态模式。受试者制定了几种策略来实现安全的步态，即：（1）通过在站立阶段冻结膝关节来减少自由度，（2）通过扩大支撑基础来保持身体平衡，以及（3）通过稳定头躯干联动装置以及特征前倾来视觉监控他的脚步。结果，去传入受试者的步态缺乏正常步态的流动性。与正常受试者相比，去传入受试者的步态模式的特点是周期长度较短，周期持续时间较长，速度较慢，节奏较低。使用双任务范式，步行的注意力需求是特别重要的（索引较长的探针反应时间）在双支撑阶段，这表明，deafferented主题使用的双支撑阶段作为一个短暂的稳定阶段，以更新认知的姿势功能，必要的生成他的下一步。
We evaluated the gait pattern of a deafferented subject who suffered a permanent loss of large sensory myelinated fibers below the neck following an acute episode of purely sensory neuropathy 21 years ago. The subject has developed several strategies to achieve a secure gait, namely: (1) a reduction of the degrees of freedom by freezing the knee articulations during the stance phase, (2) a preservation of body balance by enlarging his base of support, and (3) visual monitoring of his step by stabilizing the head-trunk linkage together with a characteristic forward tilt. As a result, the gait of the deafferented subject lacks the fluidity of normal gait. Compared with normal subjects, the gait pattern of the deafferented subject is characterized by a shorter cycle length, a longer cycle duration, a slower speed, and a lower cadence. Using a dual-task paradigm, the attentional demands for walking were particularly important (as indexed by longer probe reaction times) during the double-support phase, suggesting that the deafferented subject uses the double-support phase as a transitory stable phase to update cognitively the postural features necessary for generating his next step.