Comparisons of the lower limb kinematics between young and older adults when crossing obstacles of different heights
Comparisons of the lower limb kinematics between young and older adults when crossing obstacles of different heights
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DOI：
10.1016/j.gaitpost.2005.06.005
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发表时间：
2006-06-01
期刊：
影响因子：
2.4
通讯作者：
Chen, Sheng-Chang
中科院分区：
文献类型：
--
作者：
Lu, Tung-Wu;Chen, Hao-Ling;Chen, Sheng-Chang
15名年轻人和15名老年健康成人步行和跨越障碍物的高度为10%，20%和30%的腿长，而他们的运动学数据进行了测量与三维（3D）运动分析系统。端点变量连同三维关节运动学的领先和落后的肢体。结果表明，老年组采用摆动髋关节屈曲策略，以实现更高的领先脚趾间隙比年轻组。随着障碍物高度的增加，老年组线性增加了领先的脚趾间隙，通过改变更少的关节角组件比年轻组，允许保持必要的稳定性的身体与最小的控制努力。当拖曳肢体交叉时，老年组与年轻组相比，拖曳脚趾间隙没有显着差异，尽管不同的关节运动学模式是明显的。老年组似乎使用更保守的跨越障碍的策略。在障碍物协商过程中未能执行此策略可能会增加由于无法从意外绊倒或绊倒中恢复而导致的福尔斯跌倒的风险。这项研究的结果表明，现有的知识的基础上跨越障碍物的运动学控制的年轻受试者可以作为一个基线，为更好地了解老年人的机制和预防福尔斯在老年人的进一步研究。(C)2005 Elsevier B.V.保留所有权利。
Fifteen young and 15 older healthy adults walked and crossed obstacles with heights of 10%, 20% and 30% of their leg lengths while their kinematic data were measured with a three-dimensional (3D) motion analysis system. End-point variables together with 3D joint kinematics of both the leading and trailing limbs were obtained. The results showed that the older group adopted a swing hip flexion strategy to achieve a higher leading toe clearance than the young group. With increasing obstacle height, the older group increased linearly the leading toe clearance by changing fewer joint angular components than the young group, allowing the maintenance of the necessary stability of the body with minimum control effort. When the trailing limb was crossing, the older group showed no significant difference in the trailing toe clearance compared to the young group, although different joint kinematic patterns were evident. The older group seemed to use a more conservative strategy for obstacle-crossing. Failure to implement this strategy during obstacle negotiation may increase the risk of falls owing to an inability to recover from unexpected tripping or stumbling. The results of this study suggest that existing knowledge of the kinematic control of obstacle-crossing based on young subjects may serve as a baseline for further studies on older people for a better understanding of the mechanisms and for the prevention of falls in the elderly. (C) 2005 Elsevier B.V. All rights reserved.