Adaptive treadmill walking encourages persistent propulsion.
Adaptive treadmill walking encourages persistent propulsion.
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DOI：
10.1016/j.gaitpost.2022.02.017
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发表时间：
2022-03
期刊：
影响因子：
2.4
通讯作者：
Higginson JS
中科院分区：
文献类型：
--
作者：
Donlin MC;Pariser KM;Downer KE;Higginson JS
自适应跑步机允许通过响应步长、推进力或跑步机上的位置的变化来实时改变步行速度。在地上，固定速度和自适应跑步机行走过程中步幅时间的步幅变化或持续性已经被研究，但在自适应跑步机行走过程中推进力的持续性仍然未知。因为增加推进力通常是中风后康复的目标，所以了解步幅到步幅的可变性可以帮助康复方案设计。在适应性跑步机行走过程中，时空和推进步态变量是如何从一步到另一步变化的，它们与固定速度跑步机行走相比如何？18名年轻的健康受试者在装有仪器的分裂带跑步机上以自适应和定速模式以他们舒适的速度行走10分钟。从跑步机上收集动力学数据。对时间序列数据进行去趋势波动分析。Shapiro-Wilk检验评估了自适应、固定速度和随机混洗条件之间的正态性和单向重复测量ANOVA，Bonferroni校正显著性水平为0.0055。在自适应和固定速度条件下，步幅时间、步长、步长和制动冲动具有持续性（α > 0.5）。自适应和定速是不同的。步速在适应条件下具有持续性，在定速条件下具有反持续性（α < 0.5）。峰值推进力、峰值制动力和推进脉冲在自适应条件下持续存在，但在定速条件下（α = 0.5）则不持续。在自适应和定速条件下，净冲量是非持续性的。所有变量在混洗条件下均为非持久性。在适应性跑步机行走期间，推进力和冲动的增加持续多步。在适应性跑步机上，坚持性更强，增加的推进力转化为增加的步行速度。对于以增加推进力和速度为目标的中风后步态康复，适应性跑步机行走的较强持续性可能是有益的。
Adaptive treadmills allow real-time changes in walking speed by responding to changes in step length, propulsion, or position on the treadmill. The stride-to-stride variability, or persistence, of stride time during overground, fixed-speed, and adaptive treadmill walking has been studied, but persistence of propulsion during adaptive treadmill walking remains unknown. Because increased propulsion is often a goal of post-stroke rehabilitation, knowledge of the stride-to-stride variability may aid rehabilitation protocol design. How do spatiotemporal and propulsive gait variables vary from stride to stride during adaptive treadmill walking, and how do they compare to fixed-speed treadmill walking? Eighteen young healthy subjects walked on an instrumented split-belt treadmill in the adaptive and fixed-speed modes for 10 minutes at their comfortable speed. Kinetic data was collected from the treadmill. Detrended fluctuation analysis was applied to the time series data. Shapiro-Wilk tests assessed normality and one-way repeated measures ANOVAs compared between adaptive, fixed-speed, and randomly shuffled conditions at a Bonferroni-corrected significance level of 0.0055. Stride time, stride length, step length, and braking impulse were persistent (α > 0.5) in the adaptive and fixed-speed conditions. Adaptive and fixed-speed were different from each other. Stride speed was persistent in the adaptive condition and anti-persistent (α < 0.5) in the fixed-speed condition. Peak propulsive force, peak braking force, and propulsive impulse were persistent in the adaptive condition but not the fixed-speed condition (α ≈ 0.5). Net impulse was non-persistent in the adaptive and fixed-speed conditions. All variables were non-persistent in the shuffled condition. During adaptive treadmill walking, increases in propulsive force and impulse persist for multiple strides. Persistence was stronger on the adaptive treadmill, where increased propulsion translates into increased walking speed. For post-stroke gait rehabilitation where increasing propulsion and speed are goals, the stronger persistence of adaptive treadmill walking may be beneficial.
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