Forte Roberta, Boreham Colin A G, De Vito Giuseppe, Ditroilo Massimiliano, Pesce Caterina
Institute for Sport and Health, University College Dublin, Newstead Building, Belfield, Dublin 4, Dublin, Ireland,
Aging Clin Exp Res. 2014 Dec;26(6):645-53. doi: 10.1007/s40520-014-0216-0. Epub 2014 Apr 9.
Age-related reductions in strength and power are considered to negatively impact balance control, but the existence of a direct association is still an issue of debate. This is possibly due to the fact that balance assessment is complex, reflects different underlying physiologic mechanisms and involves quantitative measurements of postural sway or timing of performance during balance tasks. The present study evaluated the moderator effect of static postural control on the association of power and strength with dynamic balance tasks.
Fifty-seven healthy 65-75 year old individuals performed tests of dynamic functional balance (walking speed under different conditions) and of strength, power and static postural control.
Dynamic balance performance (walking speed) was associated with lower limb strength and power, as well as postural control under conditions requiring postural adjustments (narrow surface walking r(2) = 0.31, p < 0.001). An interaction effect between strength and static postural control was found with narrow surface walking and talking while walking (change of β 0.980, p < 0.001 in strength for 1 SD improvements in static postural control for narrow walking, and [Formula: see text] -0.730, p < 0.01 in talking while walking). These results indicate that good static postural control facilitates the utilisation of lower limb strength to better perform complex, dynamic functional balance tasks. Practical implications for assessment and training are discussed.
与年龄相关的力量和功率下降被认为会对平衡控制产生负面影响，但直接关联的存在仍是一个有争议的问题。这可能是由于平衡评估很复杂，反映了不同的潜在生理机制，并且涉及姿势摆动的定量测量或平衡任务期间表现的时间安排。本研究评估了静态姿势控制对力量和功率与动态平衡任务之间关联的调节作用。
57名65 - 75岁的健康个体进行了动态功能平衡测试（不同条件下的步行速度）以及力量、功率和静态姿势控制测试。
动态平衡表现（步行速度）与下肢力量和功率以及在需要姿势调整的条件下的姿势控制相关（窄面行走时r(2) = 0.31，p < 0.001）。在窄面行走和边走边说时发现了力量与静态姿势控制之间的交互作用（对于窄面行走，静态姿势控制每提高1个标准差，力量的β变化为0.980，p < 0.001，边走边说时β为 - 0.730，p < 0.01）。这些结果表明，良好的静态姿势控制有助于利用下肢力量更好地完成复杂的动态功能平衡任务。讨论了评估和训练的实际意义。
