Kubo Masayoshi, Ulrich Beverly
Division of Kinesiology, University of Michigan, 401 Washtenaw Ave., Ann Arbor, MI 48109, United States.
Infant Behav Dev. 2006 Dec;29(4):509-17. doi: 10.1016/j.infbeh.2006.05.001. Epub 2006 Jun 27.
In this study, we investigated biomechanical contributions of the high guard position of the arms observed only in a subgroup of toddlers at very early stages of gait development. Six healthy toddlers who showed this peculiar arm posture were involved in this study. They participated in two data collection sessions (1 month apart). We used three-dimensional analysis of arm posture during gait to estimate the changes in forces and torques generated by the arms and acting on the upper trunk segment. Across visits, toddlers' increase in walking speeds coincided with lowering arm postures. Despite the apparent trend of changes in arm posture in this group of toddlers, the interaction between arm posture and upper trunk position created a variety of changes in forces and torques among individuals. Findings of this study exhibited an example of the exploration of dynamics by toddlers in the early stage of gait development.
在本研究中，我们调查了仅在步态发育非常早期阶段的一小部分幼儿中观察到的手臂高防护姿势的生物力学贡献。六名表现出这种特殊手臂姿势的健康幼儿参与了本研究。他们参加了两次数据收集 session（相隔1个月）。我们使用步态期间手臂姿势的三维分析来估计手臂产生并作用于上躯干节段的力和扭矩的变化。在不同的访视中，幼儿步行速度的增加与手臂姿势的降低相一致。尽管这组幼儿的手臂姿势有明显的变化趋势，但手臂姿势与上躯干位置之间的相互作用在个体之间产生了各种力和扭矩的变化。本研究的结果展示了幼儿在步态发育早期对动力学进行探索的一个例子。
