Department of Student Research Committee, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran.
Department of Audiology, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran.
J Vestib Res. 2022;32(2):99-112. doi: 10.3233/VES-201616.
Auditory cues might play a role in postural control.
The primary aim of this study was to investigate the association between white noise and head-shake (HS) related changes in postural sway.
Fifty healthy adults underwent Synapsys Posturography System (SPS) evaluation. The posturography (PG) evaluation consisted of two protocols: sensory organization test (SOT) and SOT with head-shake (HS) (HS-SOT). The standard SOT protocol of SPS involves a battery of six postural conditions. In the current study, participants underwent only four SOT conditions. The participants were asked to stand barefoot on the SPS platform (static platform and foam). The SOT standing conditions were as follow: (1) firm surface (force platform only) with eyes open (SOT1); (2) firm surface with eyes closed (SOT2); (3) foam surface (which was positioned on the force platform) with eyes open (SOT4); and (4) foam surface with eyes closed (SOT5). For the HS-SOT protocol, we asked the participants to move their heads left and right (i.e., yaw head rotation) in the mentioned SOT conditions. Each postural condition was 10 seconds long. Both SOT and HS-SOT postural conditions were conducted across the two hearing modes of silence and noise. To achieve our aims, comparison of sway parameters between SOT and HS-SOT, and between hearing modes were considered.
White noise was associated with a reduction in postural sway. The reduction observed in sway area, sway amplitude, and sway frequency. Moreover, HS significantly increased postural sway in all HS-SOT conditions compared to their SOT equivalents (i.e., HS-SOT1 compared to SOT1, etc.). The presence of white noise was associated with a decrease in the HS-related increase in postural sway.
Considering the results, this study adds to the body of literature suggesting that white noise contributes to postural control, and the implications of this for rehabilitation need to be further investigated.
听觉线索可能在姿势控制中发挥作用。
本研究的主要目的是研究白噪声与摇头（HS）相关的姿势摆动变化之间的关系。
50 名健康成年人接受了 Synapsys 测姿系统（SPS）评估。测姿评估包括两个方案：感觉组织测试（SOT）和带有摇头（HS）的 SOT（HS-SOT）。SPS 的标准 SOT 方案包括六种姿势条件的电池。在本研究中，参与者仅进行了四个 SOT 条件。要求参与者赤脚站在 SPS 平台（静态平台和泡沫）上。SOT 站立条件如下：（1）睁眼时的坚固表面（仅力平台）（SOT1）；（2）闭眼时的坚固表面（SOT2）；（3）睁眼时的泡沫表面（置于力平台上）（SOT4）；（4）闭眼时的泡沫表面（SOT5）。对于 HS-SOT 方案，我们要求参与者在上述 SOT 条件下左右移动头部（即，头部的偏航旋转）。每个姿势条件持续 10 秒。在两种听力模式（安静和噪声）下进行了 SOT 和 HS-SOT 姿势条件。为了达到我们的目的，考虑了 SOT 和 HS-SOT 之间以及听力模式之间的摆动参数比较。
白噪声与姿势摆动减小有关。摆动面积、摆动幅度和摆动频率均降低。此外，与相应的 SOT 条件相比，HS 在所有 HS-SOT 条件下都显著增加了姿势摆动（即 HS-SOT1 与 SOT1 相比，等等）。白噪声的存在与与 HS 相关的增加姿势摆动的减少有关。
考虑到这些结果，本研究增加了表明白噪声有助于姿势控制的文献，并需要进一步研究其对康复的影响。
