Sex differences in the postural sway characteristics of young and elderly subjects during quiet natural standing
Sex differences in the postural sway characteristics of young and elderly subjects during quiet natural standing
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DOI：
10.1111/j.1447-0594.2009.00582.x
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发表时间：
2010-04-01
影响因子：
3.3
通讯作者：
Hong, Junghwa
中科院分区：
文献类型：
--
作者：
Kim, Ji-Won;Eom, Gwang-Moon;Hong, Junghwa
目的：据报道，女性跌倒发生率远高于男性，且跌倒者的姿势平衡能力较非跌倒者差。然而，姿势平衡表现是否存在性别差异尚存在争议。本研究的目的是探讨性别和年龄对自然站立宽度安静站立时平衡表现的影响及其相互作用。方法：63 名老年受试者（65-86 岁）和 66 名年轻受试者（18-26 岁）在测力板上以自我选择的自然脚距进行安静站立。四个分析变量——平均距离、平均速度、95%功率频率和总功率——源自压力中心（COP），并在前后方向和中外侧方向上进行评估。结果：在前后方向上，不存在性别效应和交互作用，但除平均距离外的所有变量均显示出显着的年龄效应（P < 0.01）。相反，内侧方向变量显示出显着的性别效应，其中女性比男性有更多但频率更低的 COP 运动（P < 0.01）。年龄和性别的交互作用在中外侧方向上也显着，其中与年龄相关的变化仅在女性中显着，因此性别差异（女性比男性的COP运动更快、总力量更大）仅存在于老年人中（P < 0.01），而在年轻人中不存在。结论：平衡表现的性别差异（其中一些仅在老年人中显着）和平衡表现与年龄相关的变化的性别差异在内外侧方向上得到体现。这些性别差异可能会导致平衡相关问题（例如跌倒）中的性别差异。
Aim:It has been reported that the fall incidence in women is much higher than men and that fallers have worse postural balance performance than non-fallers. However, it is controversial whether any sex difference in postural balance performance exists. The purpose of this study was to investigate the effects of sex and age and their interactions in balance performance during quiet standing with natural stance width.Methods:Sixty-three elderly subjects (aged 65-86 years) and 66 young subjects (aged 18-26 years) performed quiet standing with self-selected natural feet distance on a force plate. Four analysis variables - mean distance, mean velocity, 95% power frequency and total power - were derived from the center of pressure (COP) and they were evaluated both in anteroposterior and mediolateral directions.Results:In anteroposterior direction, no sex effect and interaction existed, however, all variables except mean distance showed significant age effects (P < 0.01). In contrast, mediolateral direction variables showed significant sex effect where women had greater but less frequent COP movement than men (P < 0.01). Interactions of age and sex were also significant in mediolateral direction, where age-related changes were significant only in women so that sex differences (faster COP movement with more total power in women than men) existed only in the elderly (P < 0.01) but not in the young.Conclusion:The sex difference in balance performance (some of which are significant only in the elderly) and the sex difference in age-related change of balance performance were demonstrated in mediolateral direction. These sex differences may contribute to the sex difference in balance-related problems, such as falls.