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Joint coordination in young and older adults during quiet stance: Effect of visual feedback of the center of pressure

机译:安静状态下的年轻人和老年人的关节协调:压力中心的视觉反馈的影响

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摘要

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.
机译:在监视器屏幕上提供的两种视觉反馈条件下,研究了衰老如何影响安静站立期间的身体摇摆和关节协调:固定和移动光标,代表平台测量的压力中心(COP)位置。使用不受控制的歧管方法分析了踝,膝,髋,中腰和颈椎的全时关节运动方差,从而导致COP移位。通过COP位移评估身体的摇摆。年轻人和老年人的踝关节对COP位移的贡献大于其他关节。但是,与年轻人相比,老年人的膝盖和中腰关节运动的变异性更大。在运动状态下,两组的踝关节贡献均下降,而髋关节贡献则上升,但仅老年人的COP位移增加。我们得出的结论是,可以通过提供COP视觉反馈来改变安静站立时的关节协调和身体摇摆,并且关节协调会受到衰老的影响。

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