Roll-over shapes of human locomotor systems: effects of walking speed
Roll-over shapes of human locomotor systems: effects of walking speed
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DOI：
10.1016/j.clinbiomech.2003.12.001
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发表时间：
2004-05-01
影响因子：
1.8
通讯作者：
Knox, EH
中科院分区：
文献类型：
--
作者：
Hansen, AH;Childress, DS;Knox, EH
客观的。检验非残疾下肢系统的翻滚形状不会随步行速度发生明显变化的假设。设计。重复测量 (n = 24)。背景。展示了三个下肢系统的翻转形状。它们是：(1) 足部、(2) 踝足和 (3) 膝踝足系统的翻转形状。翻转形状显示了下肢系统在足跟接触和相反足跟接触之间的行走站立阶段期间所遵循的有效摇杆（或凸轮）形状。方法。通过将压力数据中心从基于实验室的坐标系转换到三个基于身体的坐标系中的每一个来测量翻转形状。使用圆弧模型进一步表征膝-踝-足翻转形状。结果。从统计的角度来看，最佳拟合圆弧的半径不会随着步行速度的变化而发生显着变化，而圆形模型的前移确实发生了显着变化。然而，前移的变化不被认为具有临床意义。结论。涉及开发翻滚形状的生物系统适应步行速度条件的变化，包括随着速度的增加而增加的负载幅度，以保持类似的有效翻滚几何形状。
Objective. To examine the hypothesis that roll-over shapes of non-disabled lower limb systems do not change appreciably with walking speed.Design. Repeated measures (n = 24).Background. Roll-over shapes of three lower limb systems are presented. They are: roll-over shapes of the (1) foot, (2) ankle-foot, and (3) knee-ankle-foot systems. Roll-over shapes show the effective rocker (or cam) shapes that the lower limb systems conform to during the period in the stance phase of walking between heel contact and opposite heel contact.Methods. Roll-over shapes were measured by transforming center of pressure data from a laboratory-based coordinate system into each of three body-based coordinate systems. Knee-ankle-foot roll-over shapes were further characterized using a circular arc model.Results. From a statistical standpoint, the radii of the best-fit circular arcs did not change significantly with walking speed, while the forward shifts of the circular models did change significantly. However, the change in forward shift was not considered to be clinically significant.Conclusions. The biologic systems involved in developing the roll-over shapes adapt to changing conditions of walking speed, including increased loading amplitudes as speed is increased, to maintain similar effective roll-over geometries.