Anodal transcranial direct current stimulation increases corticospinal excitability, while performance is unchanged.

Anodal transcranial direct current stimulation (a-tDCS) has been shown to improve bicycle time to fatigue (TTF) tasks at 70-80% of VO2max and downregulate rate of perceived exertion (RPE). This study aimed to investigate the effect of a-tDCS on a RPE-clamp test, a 250-kJ time trial (TT) and motor ev...

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Autores principales:	Mathias Kristiansen, Mikkel Jacobi Thomsen, Jens Nørgaard, Jon Aaes, Dennis Knudsen, Michael Voigt
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/69ef0442d6624578859e80f8d63a29a0
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spelling	oai:doaj.org-article:69ef0442d6624578859e80f8d63a29a02021-12-02T20:09:09ZAnodal transcranial direct current stimulation increases corticospinal excitability, while performance is unchanged.1932-620310.1371/journal.pone.0254888https://doaj.org/article/69ef0442d6624578859e80f8d63a29a02021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0254888https://doaj.org/toc/1932-6203Anodal transcranial direct current stimulation (a-tDCS) has been shown to improve bicycle time to fatigue (TTF) tasks at 70-80% of VO2max and downregulate rate of perceived exertion (RPE). This study aimed to investigate the effect of a-tDCS on a RPE-clamp test, a 250-kJ time trial (TT) and motor evoked potentials (MEP). Twenty participants volunteered for three trials; control, sham stimulation and a-tDCS. Transcranial magnetic stimulation was used to determine the corticospinal excitability for 12 participants pre and post sham stimulation and a-tDCS. The a-tDCS protocol consisted of 13 minutes of stimulation (2 mA) with the anode placed above the Cz. The RPE-clamp test consisted of 5 minutes ergometer bicycling at an RPE of 13 on the Borg scale, and the TT consisted of a 250 kJ (∼10 km) long bicycle ergometer test. During each test, power output, heart rate and oxygen consumption was measured, while RPE was evaluated. MEPs increased significantly by 36% (±36%) post a-tDCS, with 8.8% (±31%) post sham stimulation (p = 0.037). No significant changes were found for any parameter at the RPE-clamp or TT. The lack of improvement may be due to RPE being more controlled by afferent feedback during TT tests than during TTF tests. Based on the results of the present study, it is concluded that a-tDCS applied over Cz, does not enhance self-paced cycling performance.Mathias KristiansenMikkel Jacobi ThomsenJens NørgaardJon AaesDennis KnudsenMichael VoigtPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 7, p e0254888 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Mathias Kristiansen Mikkel Jacobi Thomsen Jens Nørgaard Jon Aaes Dennis Knudsen Michael Voigt Anodal transcranial direct current stimulation increases corticospinal excitability, while performance is unchanged.
description	Anodal transcranial direct current stimulation (a-tDCS) has been shown to improve bicycle time to fatigue (TTF) tasks at 70-80% of VO2max and downregulate rate of perceived exertion (RPE). This study aimed to investigate the effect of a-tDCS on a RPE-clamp test, a 250-kJ time trial (TT) and motor evoked potentials (MEP). Twenty participants volunteered for three trials; control, sham stimulation and a-tDCS. Transcranial magnetic stimulation was used to determine the corticospinal excitability for 12 participants pre and post sham stimulation and a-tDCS. The a-tDCS protocol consisted of 13 minutes of stimulation (2 mA) with the anode placed above the Cz. The RPE-clamp test consisted of 5 minutes ergometer bicycling at an RPE of 13 on the Borg scale, and the TT consisted of a 250 kJ (∼10 km) long bicycle ergometer test. During each test, power output, heart rate and oxygen consumption was measured, while RPE was evaluated. MEPs increased significantly by 36% (±36%) post a-tDCS, with 8.8% (±31%) post sham stimulation (p = 0.037). No significant changes were found for any parameter at the RPE-clamp or TT. The lack of improvement may be due to RPE being more controlled by afferent feedback during TT tests than during TTF tests. Based on the results of the present study, it is concluded that a-tDCS applied over Cz, does not enhance self-paced cycling performance.
format	article
author	Mathias Kristiansen Mikkel Jacobi Thomsen Jens Nørgaard Jon Aaes Dennis Knudsen Michael Voigt
author_facet	Mathias Kristiansen Mikkel Jacobi Thomsen Jens Nørgaard Jon Aaes Dennis Knudsen Michael Voigt
author_sort	Mathias Kristiansen
title	Anodal transcranial direct current stimulation increases corticospinal excitability, while performance is unchanged.
title_short	Anodal transcranial direct current stimulation increases corticospinal excitability, while performance is unchanged.
title_full	Anodal transcranial direct current stimulation increases corticospinal excitability, while performance is unchanged.
title_fullStr	Anodal transcranial direct current stimulation increases corticospinal excitability, while performance is unchanged.
title_full_unstemmed	Anodal transcranial direct current stimulation increases corticospinal excitability, while performance is unchanged.
title_sort	anodal transcranial direct current stimulation increases corticospinal excitability, while performance is unchanged.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/69ef0442d6624578859e80f8d63a29a0
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Anodal transcranial direct current stimulation increases corticospinal excitability, while performance is unchanged.

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