Dynamic stability requirements during gait and standing exergames on the wii fit® system in the elderly
Dynamic stability requirements during gait and standing exergames on the wii fit® system in the elderly
复制标题
DOI：
10.1186/1743-0003-9-28
复制
发表时间：
2012-05-20
影响因子：
5.1
通讯作者：
Leclerc, Catherine
中科院分区：
文献类型：
--
作者：
Duclos, Cyril;Mieville, Carole;Leclerc, Catherine
背景：在康复训练中，训练强度通常是为了优化训练系统以获得更好的性能（过载原理）。然而，在平衡康复中，很少研究在训练练习期间优化平衡改善所需的强度水平，这可能是由于在这些练习期间难以量化稳定性水平。本研究的目的是测试稳定/不稳定力模型是否可以用于分析在几种运动游戏中稳定性如何受到挑战，这些运动游戏越来越多地用于平衡康复和动态功能任务，如步态。方法：对7名健康老年人进行了自然和快速步态的三维运动分析，在三个平衡exercgames（50/50挑战，滑雪障碍赛和足球）。稳定力、失稳力和两种力的比值的平均值和极值（稳定性指数）从运动学和动力学数据计算，以分别确定动态、姿势和总体平衡稳定性的平均值和最低水平。平均姿势稳定性较低（较低的平均不稳定力）在50/50挑战游戏期间比在所有其他任务期间，但是，正如最小不稳定力值所示，在这场比赛中，姿势不稳定的峰值时刻比其他任何任务都要小。动态稳定性越来越受到挑战（更高的平均和最大稳定力）从50/50挑战到足球和障碍赛，到自然步态速度任务和快速步态速度任务，增加了整体稳定难度（平均和最小稳定性指数）。稳定/不稳定力模型可用于评估不同任务（如步态或运动游戏）期间的平衡要求水平。我们的研究结果表明，与动态稳定性相比，姿势稳定性在所评估的任务之间没有太大差异（50/50挑战除外），动态稳定性在游戏期间比在功能任务期间受到的挑战要小得多。具有更大的质心位移和支持基础变化的游戏可能会刺激平衡控制，足以在动态功能任务中看到平衡的改善，并且可以在病理人群中使用这里使用的方法进行测试。
Background: In rehabilitation, training intensity is usually adapted to optimize the trained system to attain better performance (overload principle). However, in balance rehabilitation, the level of intensity required during training exercises to optimize improvement in balance has rarely been studied, probably due to the difficulty in quantifying the stability level during these exercises. The goal of the present study was to test whether the stabilizing/destabilizing forces model could be used to analyze how stability is challenged during several exergames, that are more and more used in balance rehabilitation, and a dynamic functional task, such as gait.Methods: Seven healthy older adults were evaluated with three-dimensional motion analysis during gait at natural and fast speed, and during three balance exergames (50/50 Challenge, Ski Slalom and Soccer). Mean and extreme values for stabilizing force, destabilizing force and the ratio of the two forces (stability index) were computed from kinematic and kinetic data to determine the mean and least level of dynamic, postural and overall balance stability, respectively.Results: Mean postural stability was lower (lower mean destabilizing force) during the 50/50 Challenge game than during all the other tasks, but peak postural instability moments were less challenging during this game than during any of the other tasks, as shown by the minimum destabilizing force values. Dynamic stability was progressively more challenged (higher mean and maximum stabilizing force) from the 50/50 Challenge to the Soccer and Slalom games, to the natural gait speed task and to the fast gait speed task, increasing the overall stability difficulty (mean and minimum stability index) in the same manner.Conclusions: The stabilizing/destabilizing forces model can be used to rate the level of balance requirements during different tasks such as gait or exergames. The results of our study showed that postural stability did not differ much between the evaluated tasks (except for the 50/50 Challenge), compared to dynamic stability, which was significantly less challenged during the games than during the functional tasks. Games with greater centre of mass displacements and changes in the base of support are likely to stimulate balance control enough to see improvements in balance during dynamic functional tasks, and could be tested in pathological populations with the approach used here.