足底振动噪声对老年人平衡能力的影响

目的 通过足底振动噪声刺激,提高老年人足底感觉敏感度,改善其平衡控制能力.方法 采用可调频振子作用于足底,利用三维运动跟踪系统对6名老年人及8名年轻人进行了平衡能力测试和评估,提取4个主要评估参量:移动轨迹总距离、最大前后动摇径、最大左右动摇径和身体移动包络面积.分析了在5种测试条件下老年人立位姿势的变化. 结果加振后4个参量均有减弱趋势,其中3个参量(移动轨迹总距离、最大左右动摇径、身体移动包络面积)有明显差异(P＜0.05),而最大前后动摇径未有明显差异(P＞0.05).不同振动频率对老年人平衡控制能力有着不同的影响.结论 微弱的振动噪声刺激,能够改善老年人平衡控制能力,可以利用在足底增加振动刺激的方法对老年人立位平衡能力进行训练.

Effects of Vibration Noise under the Feet on Balancing Ability in Elder People

Objective To enhance sensory and balancing ability by applying vibration under the feet of elder people.Methods Vibration noise was applied under the feet of 6 healthy elderlies and 8 young volunteers.Balancing performance was evaluated using a FASTRAK system.Four sway parameters(The maximum excursions range of the AP,the maximum excursions range of the ML,path length and swept area)were measured under 5 conditions.Results All four sway parameters decreased with vibration in the elderlies.Three of the four sway parameters(Path length,the maximum excursions range of the ML and swept area)were significant decreases(P<0.05).Conclusion The results suggest that low level vibration,when applied to the feet,enhances the balancing performance of healthy elderlies.These findings suggest that vibration-based devices may be helpful in improving balance control in elder people.