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首页> 外文期刊>Journal of Neurophysiology >Control of dynamic stability during gait termination on a slippery surface.
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Control of dynamic stability during gait termination on a slippery surface.

机译：控制在光滑表面上步态终止期间的动态稳定性。

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摘要

There are three common ways by which to successfully terminate gait: decreased acceleration of whole-body center of mass (COM) through a flexor synergy in the trail leg, increased deceleration of whole-body COM through an extensor synergy in the front limb, and an energy/momentum transfer to dissipate any remaining momentum if the first two strategies are unsuccessful. Healthy individuals were asked to stop on a slippery surface while we examined their unexpected response to the slippery surface. Kinetic data from the forceplates revealed lower braking forces in the slip trials compared with normal gait-termination trials. Subjects were unable to control their center of pressure (COP) to manipulate the COM as revealed by increased deviations and maximum absolute ranges of COP movement. Subject COM deviated farther in both horizontal planes and lowered further during the slip compared with normal gait-termination trials. Arm movements were effective in dissipating forward COM movement. In addition, there likely was a transfer of forward to lateral momentum to stop forward progression. All recorded muscle activity in the lower limbs and back increased during the slip to provide support to the lower limbs and correct upright balance. The trailing limb shortened its final step to provide support to the lowering COM. The balance-correction response seen here resembles previous reactions to perturbations during locomotion suggesting there is a generalized strategy employed by the nervous system to correct for disturbances and maintain balance.
机译：成功终止步态的三种常见方法是：通过后腿的屈肌协同作用降低全身重心（COM）的加速度，通过前肢的伸肌协同作用提高全身COM的减速，以及如果前两个策略不成功，则进行能量/动量传递以消除任何剩余动量。健康的个体被要求停在光滑的表面上，而我们检查了他们对光滑表面的意外反应。测力板的动力学数据表明，与正常的步态终止试验相比，滑移试验的制动力更低。受试者无法控制其压力中心（COP）来操纵COM，这是由COP运动的偏差和最大绝对范围增加所揭示的。与正常的步态终止试验相比，受试者的COM在两个水平面中均偏离更远，并且在滑移过程中进一步降低。手臂运动有效地消散了COM向前运动。此外，可能会发生向前动量向横向动量的转移，以阻止向前转的过程。在滑倒过程中，所有记录的下肢和背部肌肉活动均增加，从而为下肢提供支撑并纠正直立平衡。尾肢缩短了其最后一步，为下降的COM提供支撑。此处看到的平衡校正反应类似于以前的运动过程中对摄动的反应，表明神经系统采用了一种通用的策略来校正干扰并保持平衡。

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