Department of Physical Therapy (MC 898), University of Illinois at Chicago, 1919 W. Taylor St., Chicago, IL, 60612, USA.
PhD Program in Rehabilitation Sciences, College of Applied Health Sciences, University of Illinois at Chicago, Chicago, IL, USA.
Exp Brain Res. 2020 Mar;238(3):631-641. doi: 10.1007/s00221-020-05738-6. Epub 2020 Feb 3.
Anticipatory postural adjustments (APAs) are usually generated to minimize the potential postural disturbance induced by predictable external perturbations. Visual information about a perturbation is important for the generation of APAs, but whether people can rely on auditory information to generate APAs is unknown. The aim of this study was to investigate the role of an auditory cue in generating APAs when visual information is not available. Fifteen young adults participated in the study. They received external perturbations a) with visual information but no auditory information available, b) without neither visual nor auditory information, c) with both visual and auditory information available, and d) with only auditory information available. Electromyography (EMG) activities of eight leg and trunk muscles and displacements of the center-of-pressure (COP) were recorded and analyzed during the anticipatory and compensatory (CPAs) phases. Outcome measures included the latencies and integrals of muscle activities, COP displacements, and indices of co-contraction and reciprocal activation of muscles. The results showed that after a short training, participants were able to rely only on the auditory cue to generate APAs comparable to that when the visual information was available. In addition, a training effect was found such that the participants demonstrated stronger APAs and less demands for CPAs through the training trials. The outcome provides a foundation for future studies focusing on the utilization of auditory cues for postural control in older adults and individuals who have vision deficit.
预期姿势调整 (APAs) 通常是为了最小化可预测外部干扰引起的潜在姿势干扰而产生的。关于扰动的视觉信息对于 APA 的产生很重要，但人们是否可以依赖听觉信息来产生 APA 尚不清楚。本研究旨在探讨在没有视觉信息的情况下，听觉提示在产生 APA 中的作用。15 名年轻人参加了这项研究。他们接受了外部干扰，a) 有视觉信息但没有听觉信息，b) 既没有视觉也没有听觉信息，c) 有视觉和听觉信息，d) 只有听觉信息。在预期和补偿 (CPAs) 阶段记录和分析了 8 条腿部和躯干肌肉的肌电图 (EMG) 活动和中心压力点 (COP) 的位移。测量指标包括肌肉活动的潜伏期和积分、COP 位移以及肌肉协同收缩和反向激活的指数。结果表明，经过短暂的训练，参与者能够仅依靠听觉提示产生与视觉信息可用时相当的 APA。此外，还发现了一种训练效应，即参与者通过训练试验表现出更强的 APA 和对 CPAs 的需求减少。研究结果为未来研究提供了基础，这些研究重点关注利用听觉提示进行老年人和视力缺陷个体的姿势控制。
