Abstract
Postural regulation is based on complex interactions among postural subsystems. The auditory system too appears to have an influence on postural control. The aim of this study was to measure the influence of auditory input on postural control and to gain a deeper understanding of the interactions between auditory input and postural subsystems including subjective aspects. In 30healthy normal-hearing subjects, postural regulation and stability was measured with the Interactive Balance System (IBS; Inc.neurodata GmbH, Wien, Österreich) in 8test positions with noise (frontal presentation) and plugged without noise. The IBS is an electrophysiological measurement device that measures postural control at the product level (e.g., stability, weight distribution) and the mechanisms of postural subsystems at the process level based on frequency-oriented fast-Fourier analysis of force-time relation. At the process level, we found arelevant reduction (ηp2 ≥ 0.10) of postural regulation with noise in the frequency bands F1 (visual and nigrostriatal system ηp2 = 0.122) and F2-4 (peripheral vestibular system ηp2 = 0.125). At the product level, the weight distribution index (WDI) parameter showed arelevant increase with noise (ηp2 = 0.159). No difference between the auditory conditions was found for postural stability (parameter: stability indicator, ST). Substantial interindividual variations in the subjective estimation of the influence of auditory inputs on stability were observed. In this study, a shift in the activity of postural subsystems was observed with auditory input, while no difference was seen in ST. This leads to new insights into mechanisms of audiovestibular interaction.
Highlights
Postural regulation is based on complex interactions among postural subsystems
No difference between the auditory conditions was found for postural stability
At the process level, we found a relevant reduction (ηp2 ≥ 0.10) of postural regulation with noise in the frequency bands F1 (visual and nigrostriatal system ηp2 = 0.122) and F2–4 (peripheral vestibular system ηp2 = 0.125)
Summary
Die Haltungsregulierung basiert auf komplexen Interaktionsmechanismen posturaler Subsysteme. Dabei wurde in der Mehrzahl der Studien ein positiver Einfluss des Hörens auf das Gleichgewicht und die posturale Stabilität genannt. Bei dem Interactive Balance System (IBS, Fa. neurodata GmbH, Wien, Österreich) handelt es sich um ein FußplattenMessverfahren, das neben der Messung von Parametern der Produktebene wie Stabilität oder Kräfteschwankungen zwischen Vor- und Rückfuß auch einen Einblick in die Arbeitsweise posturaler Subsysteme (Prozessebene) ermöglicht, basierend auf einer frequenzorientierten Fast-Fourier-Analyse des Kraft-ZeitVerhältnisses. Das IBS-System wurde bereits mehrfach auf Reliabilität überprüft [22, 24, 27] und diente zur Evaluierung von Einflussfaktoren auf die posturale Stabilität und Regulation, wie beispielsweise beim Kleinhirn und nigrostriatalen System [23], beim visuellen System [7, 20], oder zur Überprüfung des Prädiktors Alter [25]. Zudem erwarteten die Autoren, ein tiefergehendes Verständnis in Bezug auf die Interaktionsmechanismen der an der posturalen Regulation beteiligten Subsysteme zu erhalten
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