Neuromuscular fatigue is not different between constant and variable frequency stimulation.

This study compared fatigue development of the triceps surae induced by two electrical stimulation protocols composed of constant and variable frequency trains (CFTs, VFTs, 450 trains, 30 Hz, 167 ms ON, 500 ms OFF and 146 ms ON, 500 ms OFF respectively). For the VFTs protocol a doublet (100 Hz) was...

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Autores principales:	Maria Papaiordanidou, Maxime Billot, Alain Varray, Alain Martin
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c9d46e5c14f54413a0d60d704b124ad7
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spelling	oai:doaj.org-article:c9d46e5c14f54413a0d60d704b124ad72021-11-18T08:39:03ZNeuromuscular fatigue is not different between constant and variable frequency stimulation.1932-620310.1371/journal.pone.0084740https://doaj.org/article/c9d46e5c14f54413a0d60d704b124ad72014-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24392155/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203This study compared fatigue development of the triceps surae induced by two electrical stimulation protocols composed of constant and variable frequency trains (CFTs, VFTs, 450 trains, 30 Hz, 167 ms ON, 500 ms OFF and 146 ms ON, 500 ms OFF respectively). For the VFTs protocol a doublet (100 Hz) was used at the beginning of each train. The intensity used evoked 30% of a maximal voluntary contraction (MVC) and was defined using CFTs. Neuromuscular tests were performed before and after each protocol. Changes in excitation-contraction coupling were assessed by analysing the M-wave [at rest (Mmax) and during MVC (Msup)] and associated peak twitch (Pt). H-reflex [at rest (Hmax) and during MVC (Hsup)] and the motor evoked potential (MEP) during MVC were studied to assess spinal and corticospinal excitability of the soleus muscle. MVC decrease was similar between the protocols (-8%, P<0.05). Mmax, Msup and Pt decreased after both protocols (P<0.01). Hmax/Mmax was decreased (P<0.05), whereas Hsup/Msup and MEP/Msup remained unchanged after both protocols. The results indicate that CFTs and VFTs gave rise to equivalent neuromuscular fatigue. This fatigue resulted from alterations taking place at the muscular level. The finding that cortical and spinal excitability remained unchanged during MVC indicates that spinal and/or supraspinal mechanisms were activated to compensate for the loss of spinal excitability at rest.Maria PapaiordanidouMaxime BillotAlain VarrayAlain MartinPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 1, p e84740 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Maria Papaiordanidou Maxime Billot Alain Varray Alain Martin Neuromuscular fatigue is not different between constant and variable frequency stimulation.
description	This study compared fatigue development of the triceps surae induced by two electrical stimulation protocols composed of constant and variable frequency trains (CFTs, VFTs, 450 trains, 30 Hz, 167 ms ON, 500 ms OFF and 146 ms ON, 500 ms OFF respectively). For the VFTs protocol a doublet (100 Hz) was used at the beginning of each train. The intensity used evoked 30% of a maximal voluntary contraction (MVC) and was defined using CFTs. Neuromuscular tests were performed before and after each protocol. Changes in excitation-contraction coupling were assessed by analysing the M-wave [at rest (Mmax) and during MVC (Msup)] and associated peak twitch (Pt). H-reflex [at rest (Hmax) and during MVC (Hsup)] and the motor evoked potential (MEP) during MVC were studied to assess spinal and corticospinal excitability of the soleus muscle. MVC decrease was similar between the protocols (-8%, P<0.05). Mmax, Msup and Pt decreased after both protocols (P<0.01). Hmax/Mmax was decreased (P<0.05), whereas Hsup/Msup and MEP/Msup remained unchanged after both protocols. The results indicate that CFTs and VFTs gave rise to equivalent neuromuscular fatigue. This fatigue resulted from alterations taking place at the muscular level. The finding that cortical and spinal excitability remained unchanged during MVC indicates that spinal and/or supraspinal mechanisms were activated to compensate for the loss of spinal excitability at rest.
format	article
author	Maria Papaiordanidou Maxime Billot Alain Varray Alain Martin
author_facet	Maria Papaiordanidou Maxime Billot Alain Varray Alain Martin
author_sort	Maria Papaiordanidou
title	Neuromuscular fatigue is not different between constant and variable frequency stimulation.
title_short	Neuromuscular fatigue is not different between constant and variable frequency stimulation.
title_full	Neuromuscular fatigue is not different between constant and variable frequency stimulation.
title_fullStr	Neuromuscular fatigue is not different between constant and variable frequency stimulation.
title_full_unstemmed	Neuromuscular fatigue is not different between constant and variable frequency stimulation.
title_sort	neuromuscular fatigue is not different between constant and variable frequency stimulation.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/c9d46e5c14f54413a0d60d704b124ad7
work_keys_str_mv	AT mariapapaiordanidou neuromuscularfatigueisnotdifferentbetweenconstantandvariablefrequencystimulation AT maximebillot neuromuscularfatigueisnotdifferentbetweenconstantandvariablefrequencystimulation AT alainvarray neuromuscularfatigueisnotdifferentbetweenconstantandvariablefrequencystimulation AT alainmartin neuromuscularfatigueisnotdifferentbetweenconstantandvariablefrequencystimulation
_version_	1718421527365419008

Neuromuscular fatigue is not different between constant and variable frequency stimulation.

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