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首页> 外文期刊>Gait & posture >Interstride trunk acceleration variability but not step width variability can differentiate between fit and frail older adults.
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Interstride trunk acceleration variability but not step width variability can differentiate between fit and frail older adults.

机译：跨步的躯干加速度可变性而不是步幅可变性可以区分适合和脆弱的老年人。

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Variability of gait may be regarded as a sign of adaptability and thus a requirement for successful locomotion, or as a sign of impaired balance control. In this study we examined the role of step width variability (SWV) and interstride trunk acceleration variability in two groups of fit and frail old people. We investigated the association of these measures and how they differentiated the two groups. We examined 33 fit older adults (mean age 73 years, S.D. 3.3 years) and 32 frail old people (mean age 80 years, S.D. 4.0 years). Subjects performed timed walking at different speeds ranging from very slow to very fast. SWV was measured from footprints. Trunk accelerations were registered by a triaxial accelerometer and interstride trunk acceleration variability assessed by an unbiased autocorrelation procedure. All measures were normalized to a walking speed of 0.9 m/s to avoid the confounding effect of gait speed on speed dependent gait parameters. SWV demonstrated low association with the trunk variability measures, and did not differ between groups. The frail group had lower mediolateral (P=0.015), but higher vertical (P=0.015) and anteroposterior (P<0.02) trunk variability than the fit group. Trunk variability classified 80% of the subjects correctly into their respective group (sensitivity=0.75, specificity=0.85). The findings are compatible with a notion that mediolateral interstride trunk variability represents a different aspect of motor control than variability in the direction of propulsion.
机译：步态的变化可被认为是适应性的标志，因此是成功运动的要求，或者被视为平衡控制受损的标志。在这项研究中，我们研究了步幅可变性（SWV）和跨步躯干加速度可变性在两组健康体弱的老年人中的作用。我们调查了这些措施的关联以及它们如何区分两组。我们检查了33位健康的老年人（平均年龄73岁，平均水平3.3岁）和32位体弱的老年人（平均年龄80岁，平均水平4.0岁）。受试者以从非常慢到非常快的不同速度执行定时步行。 SWV是根据足迹测量的。通过三轴加速度计记录躯干加速度，并通过无偏自相关程序评估跨步躯干加速度的变异性。所有测量均标准化为0.9 m / s的步行速度，以避免步态速度对速度相关步态参数的混杂影响。 SWV与躯干变异性测度的相关性较低，各组之间无差异。体弱的组的后外侧（P = 0.015）较低，但垂直（P = 0.015）和前后（P <0.02）的躯干变异性高于合适组。躯干变异性将80％的受试者正确分类为各自的组（敏感性= 0.75，特异性= 0.85）。这些发现与以下观点相吻合：前外侧跨步主干可变性代表了运动控制的一个方面，而不是推进方向的可变性。

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