A new method for evaluating motor control in gait under real-life environmental conditions. Part 2: Gait analysis
A new method for evaluating motor control in gait under real-life environmental conditions. Part 2: Gait analysis
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DOI：
10.1016/s0268-0033(98)00090-4
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发表时间：
1998-06-01
影响因子：
1.8
通讯作者：
Moe-Nilssen, R
中科院分区：
文献类型：
--
作者：
Moe-Nilssen, R
目标。通过测量站立平衡来评估步态平衡的有效性是值得怀疑的。因此，需要更好的方法来测量行走时的平衡。建议个人通过将身体重心(COM)附近的参考点平稳地朝着预定目标移动来展示足够的姿势控制，即使肢体的运动表现出与变化的环境一致的可变性。背景。尽管作为运动控制先决条件的可变性越来越引起人们的兴趣，但步态分析方法在很大程度上侧重于刻板印象中动作的对称性和可重复性。在步行过程中，通过便携式三轴加速度计系统记录参照点在腰椎上的加速度。证明了加速度均方根(RMS)与步行速度之间的二次关系，因此，如果至少有3个步行速度的加速度RMS，则可以计算二次多项式作为曲线估计。躯干上参考点上的加速度和行走速度之间的关系可以在不同试验之间进行比较，也可以在自行选择行走速度的情况下进行比较。机械测试夹具中的校准程序和仪器的精密度和准确度测试在配套的文章中描述。
Objective. The validity of assessing balance in gait by measuring balance in standing is questionable. Better methods for measuring balance during walking are therefore needed.Design. It is suggested that the individual will demonstrate adequate postural control by moving a reference point near the body centre of mass (CoM) smoothly towards an intentional goal, even though movements of the extremities show variability consistent with a changing environment.Background. In spite of an increased interest in variability as a prerequisite for motor control, gait analysis methods focus, to a large extent, on symmetry and repeatability of movements in stereotyped settings.Methods. Acceleration of a reference point over the lumbar spine is registered during walking by a portable, triaxial accelerometry system.Results. A quadratic relation between acceleration root mean square (RMS) and walking speed is demonstrated, and a second degree polynomial can therefore be computed as a curve estimate, if acceleration RMS representing at least three walking speeds are available.Conclusions. The relation between acceleration over a reference point on the trunk and walking speed can be compared between trials and also when walking speeds are self-selected. Calibration procedures and testing of the instrument for precision and accuracy in a mechanical testing jig are described in a companion article.