Questioning the lasting effect of galvanic vestibular stimulation on postural control


Autoři: Mujda Nooristani aff001;  Maxime Maheu aff001;  Marie-Soleil Houde aff001;  Benoit-Antoine Bacon aff004;  François Champoux aff001
Působiště autorů: École d’orthophonie et d’audiologie, Université de Montréal, Montréal, Québec, Canada aff001;  CIUSSS Centre-Sud-de-l’Île-de-Montréal, Montréal, Québec, Canada aff002;  Centre de recherche de l’Institut Universitaire de Gériatrie de Montréal, Montréal, Québec, Canada aff003;  Department of Psychology, Carleton University, Ottawa, Ontario, Canada aff004
Vyšlo v časopise: PLoS ONE 14(11)
Kategorie: Research Article
doi: 10.1371/journal.pone.0224619

Souhrn

Noisy galvanic vestibular stimulation (nGVS) has been shown to enhance postural stability during stimulation, and the enhancing effect has been observed to persist for several hours post-stimulation. However, these effects were observed without proper control (sham condition) and the possibility of experimental bias has not been ruled out. The lasting effect of nGVS on postural stability therefore remains in doubt. We investigated the lasting effect of nGVS on postural stability using a control (sham) condition to confirm or infirm the possibility of experimental bias. 28 participants received either nGVS or a sham stimulation. Static postural control was examined before stimulation, immediately after 30 minutes of nGVS and one-hour post-stimulation. Results showed a significant improvement of sway velocity (p<0.05) and path length (p<0.05) was observed following nGVS, as previously shown. A similar improvement of sway velocity (p<0.05) and path length (p<0.05) was observed in sham group and no significant difference was found between nGVS group and sham group (p>0.05), suggesting that the observed postural improvement in nGVS could be due to a learning effect. This finding suggests the presence of experimental bias in the nGVS effect on postural stability, and highlights the need to use a sham condition in the exploration of the nGVS effect so as to disentangle the direct effect of the electrical stimulation from a learning effect. Furthermore, numerous parameters and populations need to be tested in order to confirm or infirm the presence of a real long-lasting effect of nGVS on postural stability.

Klíčová slova:

Elderly – Foams – Functional electrical stimulation – Learning – Mastoid process – Postural control – Reflexes – Young adults


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Článek vyšel v časopise

PLOS One


2019 Číslo 11