Muscle excitability during sustained maximal voluntary contractions by a separate analysis of the M-wave phases.

Details

Serval ID
serval:BIB_4A93BDA2BCE9
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Muscle excitability during sustained maximal voluntary contractions by a separate analysis of the M-wave phases.
Journal
Scandinavian journal of medicine & science in sports
Author(s)
Rodriguez-Falces J., Place N.
ISSN
1600-0838 (Electronic)
ISSN-L
0905-7188
Publication state
Published
Issued date
12/2017
Peer-reviewed
Oui
Volume
27
Number
12
Pages
1761-1775
Language
english
Notes
Publication types: Journal Article
Publication Status: ppublish
Abstract
This study was designed to examine separately the changes in the first and second phases of the muscle compound action potential (M-wave) during and after a sustained 3-minutes maximal voluntary contraction (MVC). M-waves were evoked by supramaximal single shocks to the femoral nerve given at 10-seconds intervals throughout a sustained isometric 3-minutes MVC and also during six brief MVCs performed throughout a 30-minutes recovery period. The amplitude, duration, and area of the M-wave first and second phases, together with muscle conduction velocity and force, were measured. During the 3-minutes MVC, the amplitude of the first phase increased progressively for the first minute (33%-43%, P<.01) and remained stable thereafter, whereas the second phase initially increased for 25-35 seconds (30%-50%, P<.01), but subsequently decreased significantly before stabilizing. During the recovery period, the amplitude of the M-wave first phase showed a decreasing trend, returning to pre-fatigue values (P>.01) within 5-10 minutes, while the second phase increased progressively and remained higher than control (7%-20%, P<.01) after the 30-minutes recovery time. Maximal cross-correlations between the time course of the first phase amplitude and those of conduction velocity and force (0.9-0.93) occurred for a lag of 0 seconds, whereas maximal cross-correlations corresponding to the second-phase amplitude (0.6-0.7) occurred for a 50-seconds time lag. The present findings indicate that the potentiation of the first phase results from impaired muscle membrane excitability. The peak-to-peak amplitude and second-phase amplitude are not valid indicators of muscle excitability as they might be critically affected by muscle architectural features.

Keywords
Adult, Electric Stimulation, Electromyography, Evoked Potentials, Motor/physiology, Femoral Nerve/physiology, Humans, Isometric Contraction/physiology, Male, Quadriceps Muscle/physiology, Young Adult, M-wave, conduction velocity, femoral nerve stimulation, isometric, muscle excitability, quadriceps
Pubmed
Web of science
Create date
03/01/2017 18:06
Last modification date
22/08/2019 8:28
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