Retention of improvement in gait stability over 14 weeks due to trip-perturbation training is dependent on perturbation dose
Retention of improvement in gait stability over 14 weeks due to trip-perturbation training is dependent on perturbation dose
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DOI：
10.1016/j.jbiomech.2018.12.011
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发表时间：
2019-02-14
影响因子：
2.4
通讯作者：
Karamanidis, Kiros
中科院分区：
文献类型：
--
作者：
Konig, Matthias;Epro, Gaspar;Karamanidis, Kiros
扰动训练是降低老年人跌倒风险的一种新兴方法。本研究检查了14周内因意外的旅行样步态扰动引起的反应性步态稳定性改善的保留率的潜在差异。24名健康的中年人（41-62岁）被随机分配到一个单一的扰动组（单一，n = 9）或一组进行8个旅行样步态扰动（多，n = 15）。当参与者在跑步机上行走时，定制的制动和释放系统被用来在摆动阶段通过脚踝带向右下肢施加意外的阻力。前后稳定性边缘（MoS）计算为第一次和第二次（仅限多组）初始步行试验和14周后保持试验步行期间，支撑基底前边界与扰动步和第一次恢复步脚触地时外推质心之间的差异。MULTIPLE组保留了对扰动的反应性步态稳定性的改善（对于扰动和第一次恢复步骤，触地时的MoS增加; p < 0.01）。然而，在14周后，与初始行走会话相比，在SINGLE组中未检测到MoS的差异。这些研究结果提供了证据的阈值跳闸扰动剂量的要求，如果在几个月内，在人类神经运动系统的适应性变化，旨在提高抗跌倒技能，发生。(C)2018爱思唯尔有限公司版权所有
Perturbation training is an emerging approach to reduce fall risk in the elderly. This study examined potential differences in retention of improvements in reactive gait stability over 14 weeks resulting from unexpected trip-like gait perturbations. Twenty-four healthy middle-aged adults (41-62 years) were assigned randomly to either a single perturbation group (SINGLE, n = 9) or a group subjected to eight trip-like gait perturbations (MULTIPLE, n = 15). While participants walked on a treadmill a custombuilt brake-and-release system was used to unexpectedly apply resistance during swing phase to the lower right limb via an ankle strap. The anteroposterior margin of stability (MoS) was calculated as the difference between the anterior boundary of the base of support and the extrapolated centre of mass at foot touchdown for the perturbed step and the first recovery step during the first and second (MULTIPLE group only) perturbation trials for the initial walking session and retention-test walking 14 weeks later. Group MULTIPLE retained the improvements in reactive gait stability to the perturbations (increased MoS at touchdown for perturbed and first recovery steps; p < 0.01). However, in group SINGLE no differences in MoS were detected after 14 weeks compared to the initial walking session. These findings provide evidence for the requirement of a threshold trip-perturbation dose if adaptive changes in the human neuromotor system over several months, aimed at the improvement in fall-resisting skills, are to occur. (C) 2018 Elsevier Ltd. All rights reserved.