Age-related changes in the center of mass velocity control during walking
Age-related changes in the center of mass velocity control during walking
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DOI：
10.1016/j.neulet.2009.04.022
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发表时间：
2009-07-10
影响因子：
2.5
通讯作者：
Do, Manh-Cuong
中科院分区：
文献类型：
--
作者：
Chong, Raymond K. Y.;Chastan, Nathalie;Do, Manh-Cuong
在行走过程中，身体质心沿着垂直面振荡。在向双支撑过渡期间，其位移在中间摆动时最大，在末端摆动时最小。它的垂直速度（CoMv）已被观察到增加的质量中心之间的中期和后期摆动福尔斯下降，但减少之前双支撑。这表明质心的制动是通过主动神经控制实现的。我们测试了这种主动控制是否会随着年龄的增长（实验1）和并发认知任务（实验2）而恶化。在0.4米的短步，但老年受试者在较小程度上这样做。在认知任务期间，年轻受试者增加CoMv控制（即增加CoMv制动），同时保持步长和步行速度。另一方面，老年受试者并没有增加CoMv控制，而是通过减少步长和步行速度来保持它。这些结果表明，主动制动的CoM过渡到双支撑期间占主导地位的步骤>.4米。这可能是平衡控制系统的表现，因为制动发生在站立后期，此时体重转移到对侧。主动制动机制似乎也需要一些注意力资源。在老龄化，减少步长和速度是战略保持有效的质心控制过渡到双支撑。然而，老年人的控制程度较低，表明真正的年龄相关的缺陷。(C)2009爱思唯尔爱尔兰有限公司保留所有权利。
During walking, the body center of mass oscillates along the vertical plane. Its displacement is highest at mid-swing and lowest at terminal swing during the transition to double support. Its vertical velocity (CoMv) has been observed to increase as the center of mass falls between mid- and late swing but is reduced just before double support. This suggests that braking of the center of mass is achieved with active neural control. We tested whether this active control deteriorates with aging (Experiment 1) and during a concurrent cognitive task (Experiment 2). At short steps of .4m but older subjects did so to a lesser extent. During the cognitive task, young subjects increased CoMv control (i.e. increase in CoMv braking) while maintaining step length and walking speed. Older subjects on the other hand, did not increase CoMv control but rather maintain it by reducing both step length and walking speed. These results suggest that active braking of the CoM during the transition to double support predominates in steps >.4m. It could be a manifestation of the balance control system, since the braking occurs at late stance where body weight is being shifted to the contralateral side. The active braking mechanism also appears to require some attentional resource. In aging, reducing step length and speed are strategic to maintaining effective center of mass control during the transition to double support. However, the lesser degree of control in older adults indicates a true age-related deficit. (C) 2009 Elsevier Ireland Ltd. All rights reserved.