Gait parameters and stride-to-stride variability during familiarization to walking on a split-belt treadmill.
Gait parameters and stride-to-stride variability during familiarization to walking on a split-belt treadmill.
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DOI：
10.1016/j.clinbiomech.2009.11.002
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发表时间：
2010-05
期刊：
影响因子：
--
通讯作者：
Higginson JS
中科院分区：
文献类型：
--
作者：
Zeni JA Jr;Higginson JS
不熟悉在分带式跑步机上行走的受试者最初可能表现出步态模式改变或步态参数变异性增加。虽然以前的调查研究与熟悉时间相关的运动学变量，本研究的目的是确定所需的熟悉期，以获得最可重复的步态模式，通过评估的动力学，运动学和时空参数在一个单一的会议跑步机行走。11名健康受试者参加了一次持续9分钟的跑步机行走。运动学和动力学数据从每分钟的前30秒开始收集，从跑步机达到全速开始。获得脚跟着地时膝关节屈曲、地面反作用力、步宽和步长的平均值和标准差，以检查9分钟内每个变量的变化。评价了矢状面髋关节、膝关节和踝关节角度和力矩以及垂直和水平地面反作用力从一个步幅到后续步幅的变异性变化的平均r2值。发现垂直和水平地面反作用力、脚跟着地时的膝关节屈曲和9分钟以上的步长的变异性显著降低。只有步长显示了试验间平均值的变化。第5分钟后，任何步态变量的r2值均未增加。结果表明，为了收集准确的数据进行步态分析，受试者应熟悉的分裂带跑步机至少5分钟之前，数据收集。
Subjects unfamiliar to walking on a split-belt treadmill may initially demonstrate an altered gait pattern or increased variability of gait parameters. While previous investigations have examined kinematic variables associated with familiarization time, the objective of this study was to determine the familiarization period required to obtain the most reproducible gait pattern through the assessment of kinetic, kinematic and spatio-temporal parameters during a single session of treadmill walking. Eleven healthy subjects participated in a single bout of treadmill walking which lasted nine minutes. Kinematic and kinetic data were collected from the first thirty seconds of each minute, beginning when the treadmill reached full speed. Means and standard deviations for knee flexion at heel strike, ground reaction forces, step width and step length were obtained to examine the changes in each variable over the nine minutes. Mean r2 values were evaluated for changes in variability from one stride to the subsequent stride for sagittal plane hip, knee and ankle joint angles and moments, as well as for vertical and horizontal ground reaction forces. Significant reductions in variability were found for vertical and horizontal ground reaction forces, knee flexion at heel strike and step length over 9 minutes. Only step width showed a change in the mean value across trials. There were no increases in r2 values after the 5th minute for any of the gait variables. The results suggest that in order to collect accurate data for gait analysis, subjects should be familiarized to the split-belt treadmill for at least 5 minutes prior to data collection.
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