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首页> 外文期刊>Journal of Biomechanics >Local dynamic stability of treadmill walking: Intrasession and week-to-week repeatability
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Local dynamic stability of treadmill walking: Intrasession and week-to-week repeatability

机译：跑步机行走的局部动态稳定性：锻炼期间和每周重复性

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摘要

Repetitive falls degrade the quality of life of elderly people and of patients suffering of various neurological disorders. In order to prevent falls while walking, one should rely on relevant early indicators of impaired dynamic balance. The local dynamic stability (LDS) represents the sensitivity of gait to small perturbations: divergence exponents (maximal Lyapunov exponents) assess how fast a dynamical system diverges from neighbor points. Although numerous findings attest the validity of LDS as a fall risk index, reliability results are still sparse. The present study explores the intrasession and intersession repeatability of gait LDS using intraclass correlation coefficients (ICC) and standard error of measurement (SEM). Ninety-five healthy individuals performed 5min treadmill walking in two sessions separated by 9 days. Trunk acceleration was measured with a 3D accelerometer. Three time scales were used to estimate LDS: over 4-10 strides (λ4-10), over one stride (λ1) and over one step (λ0.5). The intrasession repeatability was assessed from three repetitions of either 35 strides or 70 strides taken within the 5min tests. The intersession repeatability compared the two sessions, which totalized 210 strides. The intrasession ICCs (70-strides estimates/35-strides estimates) were 0.52/0.18 for λ4-10 and 0.84/0.77 for λ1 and λ0.5. The intersession ICCs were around 0.60. The SEM results revealed that λ0.5 measured in medio-lateral direction exhibited the best reliability, sufficient to detect moderate changes at individual level (20%). However, due to the low intersession repeatability, one should average several measurements taken on different days in order to better approximate the true LDS.
机译：反复跌倒会降低老年人以及患有各种神经系统疾病的患者的生活质量。为了防止走路时跌倒，应该依靠动态平衡受损的相关早期指标。局部动态稳定性（LDS）表示步态对小扰动的敏感度：发散指数（最大Lyapunov指数）评估了动态系统从邻点发散的速度。尽管大量发现证明LDS作为跌倒风险指标的有效性，但可靠性结果仍然很少。本研究使用组内相关系数（ICC）和标准测量误差（SEM）探索步态LDS的会话间和会话间重复性。九十五名健康人在9天的两次锻炼中走了5分钟的跑步机。用3D加速度计测量躯干加速度。使用三个时标来估计LDS：超过4-10个步幅（λ4-10），超过1个步幅（λ1）和超过1个步幅（λ0.5）。在5分钟的测试中，从35个步幅或70个步幅的三个重复中评估了会话中的可重复性。会话间的可重复性比较了两个会话，总计210步。课间ICC（70步估计/ 35步估计）对于λ4-10为0.52 / 0.18，对于λ1和λ0.5为0.84 / 0.77。闭会期间的ICC约为0.60。 SEM结果表明，沿中外侧方向测量的λ0.5表现出最佳的可靠性，足以检测单个水平的适度变化（20％）。但是，由于会话间的可重复性较低，因此应该对在不同日期进行的几次测量取平均值，以便更好地近似真实的LDS。

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