Department of Kinesiology and Nutrition, University of Illinois at Chicago, Chicago, IL 60612, United States.
Gait Posture. 2010 Apr;31(4):461-4. doi: 10.1016/j.gaitpost.2010.02.001. Epub 2010 Feb 24.
Step-by-step variations in step width have been hypothesized to reflect adjustments to swing foot placement in response to preceding frontal plane trunk kinematics. The present study tested this hypothesis while 12 younger and 11 older subjects walked on treadmill for 10min at a self-selected velocity. The relationship between step-by-step variations in step width and frontal plane trunk COM kinematics was determined using multiple regression analysis. Trunk kinematics at midstance were significantly (p<0.001) and strongly (R(2)=0.54) related to the subsequent foot placement supporting the primary hypothesis. Additionally, this relationship was significantly affected by age (p<0.001) and stepping limb (p<0.001). These results implicate feedback driven control of foot trajectory during the swing phase. Further, they provide a biomechanical framework by which loss of frontal plane dynamic stability may result from a step width that is insufficient to decelerate and redirect trunk kinematics in preparation for the next step.
已经假设步宽的逐步变化反映了对摆动脚位置的调整，以响应前平面躯干运动学。本研究在 12 名年轻和 11 名年长受试者以自我选择的速度在跑步机上行走 10 分钟时测试了这一假设。使用多元回归分析确定了步宽的逐步变化与前平面躯干 COM 运动学之间的关系。中足时躯干运动学与随后的脚放置有显著（p<0.001）和强（R(2)=0.54）关系，支持主要假设。此外，这种关系受年龄（p<0.001）和步幅肢体（p<0.001）的显著影响。这些结果暗示了在摆动阶段对脚轨迹的反馈驱动控制。此外，它们提供了一个生物力学框架，通过该框架，由于步宽不足以减速和重新引导躯干运动学为下一步做准备，可能导致前平面动态稳定性丧失。
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