AGE-RELATED-CHANGES IN BALANCE CONTROL-SYSTEM - INITIATION OF STEPPING

被引:72
作者
PATLA, AE
FRANK, JS
WINTER, DA
RIETDYK, S
PRENTICE, S
PRASAD, S
机构
[1] Department of Kinesiology, University of Waterloo, Ont.
关键词
BALANCE; ELDERLY; STEPPING; REACTION TIME; WEIGHT TRANSFER TIME;
D O I
10.1016/0268-0033(93)90012-7
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
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.
引用
收藏
页码:179 / 184
页数:6
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