Programa de Pós-Graduação em Fisioterapia, Universidade Cidade de São Paulo, Rua Cesário Galeno, 448/475 Tatuapé, São Paulo, SP 03071-000, Brazil.
Gait Posture. 2012 Jan;35(1):83-7. doi: 10.1016/j.gaitpost.2011.08.011. Epub 2011 Oct 2.
How aging affects body sway and joint coordination during quiet standing was investigated under two visual feedback conditions provided on a monitor screen: fixed and moving cursor representing the center of pressure (COP) position measured by a platform. The across-time joint motion variance of ankle, knee, hip, mid-trunk, and cervical spine leading to COP displacement was analyzed using the uncontrolled manifold approach. The body sway was assessed by the COP displacement. Young and older adults showed greater ankle joint contribution to COP displacement than the other joints. However, older adults showed larger variability of knee and mid-trunk joint motions than young adults. During the moving condition, the ankle joint contribution decreased and hip joint contribution increased for both groups, but the COP displacement increased only for the older adults. We conclude that joint coordination and body sway during quiet standing can be modified by providing COP visual feedback and that joint coordination is affected by aging.
本研究旨在探讨在两种视觉反馈条件下（固定光标和移动光标分别代表平台测量的重心位置），静立位时衰老对身体摆动和关节协调的影响。采用无控制流形方法分析导致重心（COP）位移的踝关节、膝关节、髋关节、中躯和颈椎关节的随时间变化的关节运动变化。采用 COP 位移评估身体摆动。与其他关节相比，年轻人和老年人的踝关节对 COP 位移的贡献更大。然而，与年轻人相比，老年人的膝关节和中躯关节运动的变异性更大。在移动条件下，两组的踝关节贡献减少，髋关节贡献增加，但仅老年人的 COP 位移增加。我们得出结论，提供 COP 视觉反馈可以改变静立位时的关节协调和身体摆动，并且关节协调受衰老影响。
