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Abstract：
This study investigates the effects of metronome walking on gait dynamics in older adults, focusing on long-range correlation structures and long-range attractor divergence (assessed by maximum Lyapunov exponents). Sixty older adults participated in indoor walking tests with and without metronome cues. Gait parameters were recorded using two triaxial accelerometers attached to the lumbar region and to the foot. We analyzed logarithmic divergence of lumbar acceleration using Rosenstein\'s algorithm and scaling exponents for stride intervals from foot accelerometers using detrended fluctuation analysis (DFA). Results indicated a concomitant reduction in long-term divergence exponents and scaling exponents during metronome walking, while short-term divergence remained largely unchanged. Furthermore, long-term divergence exponents and scaling exponents were significantly correlated. Reliability analysis revealed moderate intrasession consistency for long-term divergence exponents, but poor reliability for scaling exponents. Our results suggest that long-term divergence exponents could effectively replace scaling exponents for unsupervised gait quality assessment in older adults. This approach may improve the assessment of attentional involvement in gait control and enhance fall risk assessment.
摘要：
这项研究调查了节拍器步行对老年人步态动力学的影响，专注于远程相关结构和远程吸引子发散（通过最大Lyapunov指数评估）。60名老年人参加了有节拍器提示和没有节拍器提示的室内步行测试。使用连接到腰部区域和脚的两个三轴加速度计记录步态参数。我们使用Rosenstein算法分析了腰椎加速度的对数发散，并使用去趋势波动分析（DFA）分析了脚加速度计的步幅间隔的缩放指数。结果表明，节拍器行走过程中的长期发散指数和缩放指数随之降低，而短期分歧基本保持不变。此外，长期发散指数和缩放指数显著相关。可靠性分析揭示了长期发散指数的适度内进一致性，但缩放指数的可靠性较差。我们的结果表明，长期差异指数可以有效地替代老年人无监督步态质量评估的缩放指数。这种方法可以改善步态控制中注意力参与的评估，并增强跌倒风险评估。
