Thenar Muscle Motor Imagery Increases Spinal Motor Neuron Excitability of the Abductor Digiti Minimi Muscle

When a person attempts intended finger movements, unintended finger movement also occur, a phenomenon called “enslaving”. Given that motor imagery (MI) and motor execution (ME) share a common neural foundation, we hypothesized that the enslaving effect on the spinal motor neuron excitability occurs...

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Autores principales:	Yoshibumi Bunno, Toshiaki Suzuki
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	motor imagery (MI) F-wave spinal motor neuron (SMN) enslaving effect abductor digiti minimi (ADM) Neurosciences. Biological psychiatry. Neuropsychiatry RC321-571
Acceso en línea:	https://doaj.org/article/dfeafdc8dc0f4d4480d0afd153eb0d5c
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spelling	oai:doaj.org-article:dfeafdc8dc0f4d4480d0afd153eb0d5c2021-12-02T09:23:54ZThenar Muscle Motor Imagery Increases Spinal Motor Neuron Excitability of the Abductor Digiti Minimi Muscle1662-516110.3389/fnhum.2021.753200https://doaj.org/article/dfeafdc8dc0f4d4480d0afd153eb0d5c2021-12-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fnhum.2021.753200/fullhttps://doaj.org/toc/1662-5161When a person attempts intended finger movements, unintended finger movement also occur, a phenomenon called “enslaving”. Given that motor imagery (MI) and motor execution (ME) share a common neural foundation, we hypothesized that the enslaving effect on the spinal motor neuron excitability occurs during MI. To investigate this hypothesis, electromyography (EMG) and F-wave analysis were conducted in 11 healthy male volunteers. Initially, the EMG activity of the left abductor digiti minimi (ADM) muscle during isometric opposition pinch movement by the left thumb and index finger at 50% maximal effort was compared with EMG activity during the Rest condition. Next, the F-wave and background EMG recordings were performed under the Rest condition, followed by the MI condition. Specifically, in the Rest condition, subjects maintained relaxation. In the MI condition, they imagined isometric left thenar muscle activity at 50% maximal voluntary contraction (MVC). During ME, ADM muscle activity was confirmed. During the MI condition, both F-wave persistence and the F-wave/M-wave amplitude ratio obtained from the ADM muscle were significantly increased compared with that obtained during the Rest condition. No difference was observed in the background EMG between the Rest and MI conditions. These results suggest that MI of isometric intended finger muscle activity at 50% MVC facilitates spinal motor neuron excitability corresponding to unintended finger muscle. Furthermore, MI may induce similar modulation of spinal motor neuron excitability as actual movement.Yoshibumi BunnoToshiaki SuzukiFrontiers Media S.A.articlemotor imagery (MI)F-wavespinal motor neuron (SMN)enslaving effectabductor digiti minimi (ADM)Neurosciences. Biological psychiatry. NeuropsychiatryRC321-571ENFrontiers in Human Neuroscience, Vol 15 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	motor imagery (MI) F-wave spinal motor neuron (SMN) enslaving effect abductor digiti minimi (ADM) Neurosciences. Biological psychiatry. Neuropsychiatry RC321-571
spellingShingle	motor imagery (MI) F-wave spinal motor neuron (SMN) enslaving effect abductor digiti minimi (ADM) Neurosciences. Biological psychiatry. Neuropsychiatry RC321-571 Yoshibumi Bunno Toshiaki Suzuki Thenar Muscle Motor Imagery Increases Spinal Motor Neuron Excitability of the Abductor Digiti Minimi Muscle
description	When a person attempts intended finger movements, unintended finger movement also occur, a phenomenon called “enslaving”. Given that motor imagery (MI) and motor execution (ME) share a common neural foundation, we hypothesized that the enslaving effect on the spinal motor neuron excitability occurs during MI. To investigate this hypothesis, electromyography (EMG) and F-wave analysis were conducted in 11 healthy male volunteers. Initially, the EMG activity of the left abductor digiti minimi (ADM) muscle during isometric opposition pinch movement by the left thumb and index finger at 50% maximal effort was compared with EMG activity during the Rest condition. Next, the F-wave and background EMG recordings were performed under the Rest condition, followed by the MI condition. Specifically, in the Rest condition, subjects maintained relaxation. In the MI condition, they imagined isometric left thenar muscle activity at 50% maximal voluntary contraction (MVC). During ME, ADM muscle activity was confirmed. During the MI condition, both F-wave persistence and the F-wave/M-wave amplitude ratio obtained from the ADM muscle were significantly increased compared with that obtained during the Rest condition. No difference was observed in the background EMG between the Rest and MI conditions. These results suggest that MI of isometric intended finger muscle activity at 50% MVC facilitates spinal motor neuron excitability corresponding to unintended finger muscle. Furthermore, MI may induce similar modulation of spinal motor neuron excitability as actual movement.
format	article
author	Yoshibumi Bunno Toshiaki Suzuki
author_facet	Yoshibumi Bunno Toshiaki Suzuki
author_sort	Yoshibumi Bunno
title	Thenar Muscle Motor Imagery Increases Spinal Motor Neuron Excitability of the Abductor Digiti Minimi Muscle
title_short	Thenar Muscle Motor Imagery Increases Spinal Motor Neuron Excitability of the Abductor Digiti Minimi Muscle
title_full	Thenar Muscle Motor Imagery Increases Spinal Motor Neuron Excitability of the Abductor Digiti Minimi Muscle
title_fullStr	Thenar Muscle Motor Imagery Increases Spinal Motor Neuron Excitability of the Abductor Digiti Minimi Muscle
title_full_unstemmed	Thenar Muscle Motor Imagery Increases Spinal Motor Neuron Excitability of the Abductor Digiti Minimi Muscle
title_sort	thenar muscle motor imagery increases spinal motor neuron excitability of the abductor digiti minimi muscle
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/dfeafdc8dc0f4d4480d0afd153eb0d5c
work_keys_str_mv	AT yoshibumibunno thenarmusclemotorimageryincreasesspinalmotorneuronexcitabilityoftheabductordigitiminimimuscle AT toshiakisuzuki thenarmusclemotorimageryincreasesspinalmotorneuronexcitabilityoftheabductordigitiminimimuscle
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Thenar Muscle Motor Imagery Increases Spinal Motor Neuron Excitability of the Abductor Digiti Minimi Muscle

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