[The effect of visual-vestibular sensory input consistency on standing stability and electroencephalogram brain network characteristics in the elderly].

Q3 Medicine
生理学报 Pub Date : 2023-12-25
Yi Yang, Guo-Zheng Wang, An-Ke Hua, Zeng-Ming Hao, Cong Huang, Jun Liu, Jian Wang
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引用次数: 0

Abstract

Aging is a crucial factor influencing postural stability control and contributing to frequent falls, yet its underlying mechanisms remain incompletely understood. This study aims to explore the effects of aging on postural stability control by comparing differences in postural stability and node strength of electroencephalogram (EEG) brain network between elderly and young people under the conditions of congruent and incongruent visual-vestibular sensory inputs. Eighteen elderly volunteers without neuromuscular disorders and eighteen young individuals participated in the present study. Virtual reality (VR) technology was employed to manipulate visual rotation stimuli (clockwise and counterclockwise), and a horizontal rotating platform was used for vestibular rotation stimuli (clockwise). Based on the directional disparity of sensory input in the horizontal plane, visual-vestibular input consistency was categorized as congruent and incongruent. Postural stability was assessed by the center of pressure (COP) trajectory, and EEG signals were collected and analyzed using directed network analysis to observe EEG brain network node connectivity strength. The results revealed that, under conditions of incongruent visual-vestibular sensory inputs, the elderly exhibited significantly inferior postural stability performance in terms of COP anterior-posterior (Y-axial) sway speed, total path length, anterior-posterior and medial-lateral sample entropy, compared to the young adults. Moreover, the node connectivity strength of visual cortex in the elderly was notably higher, while node connectivity strength of superior temporal cortex was significantly lower than that in the young adults. These findings suggest that the elderly have a heightened reliance on visual information in postural control and an impaired ability to cope with sensory conflicts arising from incongruent visual-vestibular sensory inputs, leading to compromised postural stability. The outcomes of this study hold significant implications for future assessments of balance function in the elder and fall prevention trainings.

[视觉-前庭感觉输入一致性对老年人站立稳定性和脑电图脑网络特征的影响]。
衰老是影响姿势稳定性控制的关键因素,也是导致频繁跌倒的原因之一,但人们对衰老的内在机制仍然知之甚少。本研究旨在通过比较老年人和年轻人在视觉-前庭感觉输入一致和不一致条件下姿势稳定性和脑电图(EEG)脑网络节点强度的差异,探讨衰老对姿势稳定性控制的影响。18 名无神经肌肉疾病的老年志愿者和 18 名年轻人参与了本研究。研究采用虚拟现实(VR)技术来操控视觉旋转刺激(顺时针和逆时针),并使用水平旋转平台来操控前庭旋转刺激(顺时针)。根据水平面感觉输入的方向差异,将视觉-前庭输入一致性分为一致和不一致。通过压力中心(COP)轨迹评估姿势稳定性,并收集和分析脑电信号,使用定向网络分析法观察脑电网络节点连接强度。结果发现,在视觉-前庭感觉输入不一致的条件下,老年人在COP前-后(Y轴)摇摆速度、总路径长度、前-后和内-外侧样本熵方面的姿势稳定性表现明显不如青壮年。此外,老年人视觉皮层的节点连接强度明显高于青壮年,而颞上皮层的节点连接强度则明显低于青壮年。这些研究结果表明,老年人在姿势控制中对视觉信息的依赖性增强,应对视觉-前庭感觉输入不一致所产生的感觉冲突的能力减弱,从而导致姿势稳定性受损。这项研究的结果对未来评估老年人的平衡功能和预防跌倒训练具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
生理学报
生理学报 Medicine-Medicine (all)
CiteScore
1.20
自引率
0.00%
发文量
4820
期刊介绍: Acta Physiologica Sinica (APS) is sponsored by the Chinese Association for Physiological Sciences and Shanghai Institutes of Biological Sciences, Chinese Academy of Sciences (CAS), and is published bimonthly by the Science Press, China. APS publishes original research articles in the field of physiology as well as research contributions from other biomedical disciplines and proceedings of conferences and symposia of physiological sciences. Besides “Original Research Articles”, the journal also provides columns as “Brief Review”, “Rapid Communication”, “Experimental Technique”, and “Letter to the Editor”. Articles are published in either Chinese or English according to authors’ submission.
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