AGE-RELATED-CHANGES IN BALANCE CONTROL-SYSTEM - INITIATION OF STEPPING
AGE-RELATED-CHANGES IN BALANCE CONTROL-SYSTEM - INITIATION OF STEPPING
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DOI：
10.1016/0268-0033(93)90012-7
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发表时间：
1993-07-01
影响因子：
1.8
通讯作者：
PRASAD, S
中科院分区：
文献类型：
--
作者：
PATLA, AE;FRANK, JS;PRASAD, S
研究了一组健康的、健康的、年轻的和年老的受试者在灯光提示下开始向前、侧向和向后三个方向之一的行走时的平衡控制系统。这些运动的表现需要将支撑从两英尺转移到一英尺，将质量中心移动到最初的支撑基础之外，并创建一个新的支撑结构。通过记录和分析受试者脚下的垂直地面反作用力，我们能够检查在肢体抬起前的两个阶段：反应时间和体重转移时间。反应时间和体重转移时间都随着年龄的增长而增加：老年受试者的体重转移时间比反应时间成比例地增加。产生的峰值力表现出年龄方向效应：老年人向前行走的峰值力明显低于年轻受试者。较大的重量传递增加导致较慢的步进响应。由于经常使用步进任务来避免下降，因此响应执行时间的增加可能会产生不良后果。
The balance control system of a group of healthy and fit, young and elderly subjects was studied during the initiation of stepping in one of three directions: forward, sideways, and backwards in response to a light cue. The performance of these movements requires shifting support from two to one foot, moving the centre of mass outside the initial base of support and creating a new support configuration. By recording and analysing the vertical ground reaction force beneath the subject's stepping foot, we were able to examine the two phases prior to limb lift-off for stepping: reaction time and weight transfer time. Both reaction time and weight transfer time increased with age: The elderly subjects had a proportionately larger increase in weight transfer time compared to the reaction time. The peak force generated showed an age by stepping direction effect: the elderly had a significantly lower peak force for the forwards stepping compared to the younger subjects. The larger increase in weight transfer results in a slower stepping response. Since a stepping task is often recruited to avoid a fall, the increase in response execution time can have undesirable consequences.