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首页> 外文期刊>Journal of Biomechanics >Adaptive feedback potential in dynamic stability during disturbed walking in the elderly.
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Adaptive feedback potential in dynamic stability during disturbed walking in the elderly.

机译：老年人步行不便时动态稳定性的自适应反馈潜力。

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摘要

After perturbation of the gait, feedback information may help regaining balance adequately, but it remains unknown whether adaptive feedback responses are possible after repetitive and unexpected perturbations during gait and if there are age-related differences. Prior experience may contribute to improved reactive behavior. Fourteen old (59-73 yrs) and fourteen young (22-31 yrs) males walked on a walkway which included one covered element. By exchanging this element participants either stepped on hard surface or unexpectedly on soft surface which caused a perturbation in gait. The gait protocol contained 5 unexpected soft trials to quantify the reactive adaptation. Each soft trial was followed by 4-8 hard trials to generate a wash-out effect. The dynamic stability was investigated by using the margin of stability (MoS), which was calculated as the difference between the anterior boundary of the base of support and the extrapolated position of the center of mass in the anterior-posterior direction. MoS at recovery leg touchdown were significantly lower in the unexpected soft trials compared to the baseline, indicating a less stable posture. However, MoS increased (p<0.05) in both groups within the disturbed trials, indicating feedback adaptive improvements. Young and old participants showed differences in the handling of the perturbation in the course of several trials. The magnitude of the reactive adaptation after the fifth unexpected perturbation was significantly different compared to the first unexpected perturbation (old: 49+/-30%; young: 77+/-40%), showing a tendency (p=0.065) for higher values in the young participants. Old individuals maintain the ability to adapt to feedback controlled perturbations. However, the locomotor behavior is more conservative compared to the young ones, leading to disadvantages in the reactive adaptation during disturbed walking.
机译：在步态受到干扰之后，反馈信息可能有助于充分恢复平衡，但是在步态反复和意外干扰之后是否存在适应性反馈响应以及是否存在与年龄相关的差异，这一点仍然未知。先前的经验可能有助于改善反应行为。 14名年龄在59-73岁之间的男性和14名年轻人在22-31岁之间的男性在一条走道上行走，走道上有一个被遮盖的元素。通过交换这种元素，参与者要么踩在坚硬的表面上，要么出乎意料地踩在柔软的表面上，从而引起步态干扰。步态方案包含5个意外的软试验，用于量化反应适应性。每个软试验之后进行4-8次硬试验，以产生清除效果。通过使用稳定裕度（MoS）研究动态稳定性，该裕度计算为支撑基础的前边界与质心在前后方向上的外推位置之间的差。在意外的软性试验中，恢复腿着地时的MoS显着低于基线，表明姿势不太稳定。但是，在受干扰的试验中，两组的MoS均增加（p <0.05），表明反馈适应性改善。在几项试验过程中，年轻和老参与者都表现出不同的摄动方式。与第一个意外扰动相比，第五个意外扰动后的反应适应幅度明显不同（老：49 +/- 30％;年轻：77 +/- 40％），显示出更高的趋势（p = 0.065）青年参与者的价值观。老年个体保持适应反馈控制的摄动的能力。然而，运动行为比年轻行为更为保守，从而导致步行不便时反应适应性的缺点。

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