Influence of real and virtual heights on standing balance
Influence of real and virtual heights on standing balance
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DOI：
10.1016/j.gaitpost.2012.02.010
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发表时间：
2012-06-01
期刊：
影响因子：
2.4
通讯作者：
Carpenter, Mark G.
中科院分区：
文献类型：
--
作者：
Cleworth, Taylor W.;Horslen, Brian C.;Carpenter, Mark G.
由威胁性场景引起的恐惧和焦虑，如站在高架表面上，已被证明会影响年轻人的姿势控制。还需要了解姿势威胁如何影响平衡缺陷和福尔斯风险人群的姿势控制。然而，安全性和可行性问题限制了将这些人群置于身体威胁场景中的机会。虚拟现实（VR）已成功地用于模拟威胁环境，虽然目前还不清楚是否可以通过虚拟和真实的威胁条件的变化引起相同的姿势变化。因此，本研究的目的是比较真实的和虚拟的高度对站立姿势控制，皮肤电活动（EDA）和心理社会状态的变化的影响。17名受试者站在真实的和虚拟环境中的低和高的高度，这些环境在尺度和视觉细节上都是匹配的。重复测量方差分析显示，EDA，焦虑，恐惧和压力中心（COP）频率随高度增加，独立于视觉环境，感知稳定性，平衡信心和COP振幅随高度降低。相互作用的影响，看到恐惧和COP的平均位置，其中真实的引起更大的变化与高度比VR。这项研究证明了VR的实用性，因为模拟的高度导致了姿势，自主神经和心理社会措施的变化，与真实的高度相似。因此，VR可能是一个有用的工具，研究威胁相关的变化，在人群中的姿势控制的风险福尔斯，并筛选和恢复平衡赤字与恐惧和焦虑。(C)2012 Elsevier B.V.保留所有权利。
Fear and anxiety induced by threatening scenarios, such as standing on elevated surfaces, have been shown to influence postural control in young adults. There is also a need to understand how postural threat influences postural control in populations with balance deficits and risk of falls. However, safety and feasibility issues limit opportunities to place such populations in physically threatening scenarios. Virtual reality (VR) has successfully been used to simulate threatening environments, although it is unclear whether the same postural changes can be elicited by changes in virtual and real threat conditions. Therefore, the purpose of this study was to compare the effects of real and virtual heights on changes to standing postural control, electrodermal activity (EDA) and psycho-social state. Seventeen subjects stood at low and high heights in both real and virtual environments matched in scale and visual detail. A repeated measures ANOVA revealed increases with height, independent of visual environment, in EDA, anxiety, fear, and center of pressure (COP) frequency, and decreases with height in perceived stability, balance confidence and COP amplitude. Interaction effects were seen for fear and COP mean position; where real elicited larger changes with height than VR. This study demonstrates the utility of VR, as simulated heights resulted in changes to postural, autonomic and psycho-social measures similar to those seen at real heights. As a result, VR may be a useful tool for studying threat related changes in postural control in populations at risk of falls, and to screen and rehabilitate balance deficits associated with fear and anxiety. (C) 2012 Elsevier B.V. All rights reserved.