A simple model of stability limits applied to sidestepping in young, elderly and elderly fallers.
A simple model of stability limits applied to sidestepping in young, elderly and elderly fallers.
复制标题
一个简单的稳定性极限模型，适用于年轻、年长和老年跌倒者的回避。
DOI：
10.1109/iembs.2006.260199
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
Rogers,MarkW
中科院分区：
文献类型：
--
作者：
Patton,JamesL;Hilliard,MarjorieJohnson;Martinez,Kathy;Mille,Marie-Laure;Rogers,MarkW
Impaired lateral balance involving the frontal plane is particularly relevant to the problem of falls with aging. Protective stepping is critical to avoiding falling, and mediolateral (M-L) stepping involves two quite complicated action choices - lateral side step and crossover stepping. The aims of this study were to identify differences in movement patterns between young healthy subjects and elderly fallers and non-fallers (determined prospectively over a year), and to identify performance differences for the two types of stepping response. Our tool for these evaluations was a computational model of the center of mass as a pendulum, which identifies the limits of stability beyond which additional steps are required. In response to multi-directional stepper-motor induced waist-pull perturbations of standing balance, the older groups took multiple steps more often than the young (55% compared to 9% of the trials), and the largest differences were seen in the pulls to the side. On these side pulls, crossover stepping and limb collisions increased with age and prospectively determined fall risk. Consequently the model analysis focused only on the most problematic lateral pulls, and only on pulls to the right. In both stepping off and landing, the young most closely approached the stability limits predicted by the model, followed by the older non-fallers and then fallers. In crossover stepping, all groups landed closer to their limits when multiple steps occurred, though older fallers were closest to instability.
