作为速度和系统约束函数的步态周期动态稳定性。
Dynamic stability of gait cycles as a function of speed and system constraints.
作者信息
Buzzi Ugo H, Ulrich Beverly D
机构信息
Division of Kinesiology at the University of Michigan, Ann Arbor, MI 48109-2214, USA.
出版信息
Motor Control. 2004 Jul;8(3):241-54. doi: 10.1123/mcj.8.3.241.
Abstract
The purpose of this study was to examine the dynamic stability of two groups of children with different dynamic resources in changing contexts. The stability of the lower extremity segments of preadolescent children (8-10 years old) with and without Down syndrome (DS) was evaluated as children walked on a motorized treadmill at varying speeds. Tools from nonlinear dynamics, maximum Lyapunov exponent, and approximate entropy were used to assess the behavioral stability of segmental angular displacements of the thigh, shank, and foot. Our results suggest that children with DS show decreased dynamic stability during walking in all segments and that this might be a consequence of inherently different subsystem constraints between these groups. Differences between groups also varied, though not uniformly, with speed, suggesting that inherent differences could further constrain the behavioral response to changing task demands.
摘要
本研究的目的是检验两组具有不同动态资源的儿童在变化情境中的动态稳定性。在儿童以不同速度在电动跑步机上行走时，评估了患有和未患有唐氏综合征（DS）的青春期前儿童（8至10岁）下肢节段的稳定性。使用非线性动力学工具、最大Lyapunov指数和近似熵来评估大腿、小腿和足部节段角位移的行为稳定性。我们的结果表明，患有DS的儿童在行走时所有节段的动态稳定性均降低，这可能是由于这些组之间固有的子系统约束不同所致。组间差异也随速度而变化，尽管并不一致，这表明固有差异可能会进一步限制对不断变化的任务需求的行为反应。
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