Initiation of movement from quiet stance: comparison of gait and stepping in elderly subjects of different levels of functional ability
Initiation of movement from quiet stance: comparison of gait and stepping in elderly subjects of different levels of functional ability
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DOI：
10.1016/j.gaitpost.2004.03.003
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发表时间：
2005-04-01
期刊：
影响因子：
2.4
通讯作者：
Levy, C
中科院分区：
文献类型：
--
作者：
Brunt, D;Santos, V;Levy, C
本研究描述了老年受试者如何启动步态，并从一个安静的立场步骤。根据所选标准化测试的分数，将受试者分为高（HFL）或低功能水平（LFL）组，并要求其启动步态，踏上10 cm高，1.22 m宽的路缘，并以自定速度跨过10 cm高，9 cm宽的障碍物。步进条件影响运动速度。很明显，所有受试者降低启动速度的遏制和障碍相比，步态启动。摆动和站立肢体加速度，地面反作用力和肌电振幅调制根据启动速度。脚趾间隙是大于障碍比遏制和步态启动。摆动脚趾离地明显更早，并且HFL组的障碍物清除率有更高的趋势。由于脚趾离地速度较慢可能会影响脚趾越过障碍物的间隙，LFL组的患者似乎有更大的跌倒风险。(c)2004 Elsevier B.V.保留所有权利。
This study describes how elderly subjects initiate gait, and step from a position of quiet stance. Based on scores from selected standardized tests subjects were placed in either a high (HFL) or low functional level (LFL) group and were asked to initiate gait, step onto a 10cm high, 1.22 m wide curb and step over a 10 cm high, 9 cm wide obstacle at a self paced speed. Stepping conditions affected the velocity of movement. It was clear that all subjects decreased initiation velocity for both curb and obstacle compared to gait initiation. Swing and stance limb acceleration ground reaction forces and EMG amplitude were modulated according to initiation velocity. Toe clearance was greater for obstacle than curb and gait initiation. Swing toe-off was significantly earlier and there was a trend for obstacle clearance to be greater for the HFL group. Those in the LFL group appear to be at a greater risk for falling due to the possible effect of slower rate of toe-off that could influence toe clearance over the obstacle. (c) 2004 Elsevier B.V. All rights reserved.