Repeated exposure to tripping like perturbations elicits more precise control and lower toe clearance of the swinging foot during steady walking
Repeated exposure to tripping like perturbations elicits more precise control and lower toe clearance of the swinging foot during steady walking
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DOI：
10.1016/j.humov.2021.102775
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发表时间：
2021-02-22
影响因子：
2.1
通讯作者：
Monaco, Vito
中科院分区：
文献类型：
--
作者：
Miyake, Tamon;Aprigliano, Federica;Monaco, Vito
控制最小趾间隙（MTC）被认为是防止跳闸的重要因素。在目前的研究中，我们调查的修改神经肌肉控制基础脚趾间隙在稳定的运动诱导反复暴露于绊倒样扰动的右摆动脚。14名健康的年轻人（平均年龄26.4 ± 3.1岁）参加了这项研究。实验方案由三个相同的试验组成，每个试验涉及三个阶段：稳定行走（基线）、扰动和稳定行走（扰动后）。在扰动过程中，参与者经历了30次由定制的机电扰动设备在意想不到的时间提供的跳闸样扰动。对于所有试验，在基线和扰动后阶段收集的大约90个步幅中计算MTC的时间参数（节奏和站立阶段%）、平均值和标准差。使用三因素重复测量方差分析分析试验（三个水平）、阶段（两个水平：基线和扰动后）和足部（两个水平：右侧和左侧）对结局变量的影响。结果表明，暴露于重复的旅行样扰动修改MTC向更精确的控制和更低的脚趾间隙的摆动脚，这似乎反映了潜在的即将到来的扰动和更快的补偿反应的情况下，缺乏平衡的预期。此外，运动控制使受试者在扰动后稳定行走期间保持对称的节奏特征。最后，暴露于扰动的影响在连续的试验中很快消失。
Controlling minimum toe clearance (MTC) is considered an important factor in preventing tripping. In the current study, we investigated modifications of neuro-muscular control underlying toe clearance during steady locomotion induced by repeated exposure to tripping-like perturbations of the right swing foot. Fourteen healthy young adults (mean age 26.4 +/- 3.1 years) participated in the study. The experimental protocol consisted of three identical trials, each involving three phases: steady walking (baseline), perturbation, and steady walking (post perturbation). During the perturbation, participants experienced 30 tripping-like perturbations at unexpected timing delivered by a custom-made mechatronic perturbation device. The temporal parameters (cadence and stance phase%), mean, and standard deviation of MTC were computed across approximately 90 strides collected during both baseline and post-perturbation phases, for all trials. The effects of trial (three levels), phase (two levels: baseline and post-perturbation) and foot (two levels: right and left) on the outcome variables were analyzed using a three-way repeated measures analysis of variance. The results revealed that exposure to repeated trip-like perturbations modified MTC toward more precise control and lower toe clearance of the swinging foot, which appeared to reflect both the expectation of potential forthcoming perturbations and a quicker compensatory response in cases of a lack of balance. Moreover, locomotion control enabled subjects to maintain symmetric rhythmic features during post-perturbation steady walking. Finally, the effects of exposure to perturbation quickly disappeared among consecutive trials.