Variability of segment coordination using a vector coding technique: Reliability analysis for treadmill walking and running
Variability of segment coordination using a vector coding technique: Reliability analysis for treadmill walking and running
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DOI：
10.1016/j.gaitpost.2016.11.004
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发表时间：
2017-01-01
期刊：
影响因子：
2.4
通讯作者：
Boyer, Katherine A.
中科院分区：
文献类型：
--
作者：
Hafer, Jocelyn F.;Boyer, Katherine A.
协调变异性(CV)量化了个体在一项任务中使用的各种运动模式，并可能提供该个体运动系统灵活性的衡量标准。虽然节段CV作为运动系统健康或适应性的标志越来越流行，但尚不清楚需要多少步长的数据才能可靠地计算CV。这项研究旨在确定在跑步机上行走和跑步时可靠计算CV所需的步数，并在健康人群中比较步行和跑步之间的CV。10名健康青年在跑步机上以较好的速度行走和跑步，并使用改进的矢量编码技术计算以下节段对的CV：骨盆前平面与大腿额平面、大腿矢状面与小腿矢状面、大腿矢状面与小腿横平面、小腿横切面与后足额平面。每个参与者和步态类型的2-15步的每对感兴趣的配对的CV被计算。计算了整个步态周期的平均CV，并分别计算了步态周期的4个阶段。对于跑步和步行，分别8步和10步就足以获得可靠的CV估计。在大腿和小腿夫妇的比较中，步行和跑步的CV有显著差异。这些结果表明，需要10个跑步机数据来可靠地计算步行和跑步的CV。此外，行走和跑步之间的CV差异表明，膝关节(即大腿-小腿之间)控制的作用在这两种运动形式中可能不同。(C)2016爱思唯尔B.V.保留所有权利。
Coordination variability (CV) quantifies the variety of movement patterns an individual uses during a task and may provide a measure of the flexibility of that individual's motor system. While there is growing popularity of segment CV as a marker of motor system health or adaptability, it is not known how many strides of data are needed to reliably calculate CV. This study aimed to determine the number of strides needed to reliably calculate CV in treadmill walking and running, and to compare CV between walking and running in a healthy population. Ten healthy young adults walked and ran at preferred speeds on a treadmill and a modified vector coding technique was used to calculate CV for the following segment couples: pelvis frontal plane vs. thigh frontal plane, thigh sagittal plane vs. shank sagittal plane, thigh sagittal plane vs. shank transverse plane, and shank transverse plane vs. rearfoot frontal plane. CV for each coupling of interest was calculated for 2-15 strides for each participant and gait type. Mean CV was calculated across the entire gait cycle and, separately, for 4 phases of the gait cycle. For running and walking 8 and 10 strides, respectively, were sufficient to obtain a reliable CV estimate. CV was significantly different between walking and running for the thigh vs. shank couple comparisons. These results suggest that 10 strides of treadmill data are needed to reliably calculate CV for walking and running. Additionally, the differences in CV between walking and running suggest that the role of knee (i.e., inter-thigh-shank) control may differ between these forms of locomotion. (C) 2016 Elsevier B.V. All rights reserved.