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Central changes in muscle fatigue during sustained submaximal isometric voluntary contraction as revealed by transcranial magnetic stimulation

Authorized Users Only
1996
Authors
Ljubisavljević, Miloš
Milanović, Slađan
Radovanović, S
Vukcević, I
Kostić, V
Anastasijević, R
Article (Published version)
Metadata
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Abstract
Changes in responses to transcranial magnetic stimulation (TMS) during submaximal isometric voluntary contraction (60% of maximal voluntary contraction (MVC)) of the adductor pollicis muscle and the subsequent recovery period have been studied in healthy volunteers. TMS at twice the motor threshold was applied during the sustained contraction, as well as at rest and during shortlasting (2 s) 60% MVCs before and immediately after the sustained contraction, and at 5 min intervals during the recovery period. Both motor evoked potential (MEP) magnitude (peak and area) and silent period (SP) duration in electromyographic activity (EMG) of the adductor pollicis muscle showed a gradual decrease up to the endurance point and an increase thereafter. MEPs elicited at rest immediately after the fatiguing contraction were larger, whereas those elicited later on during the recovery period did not differ significantly from the controls. It is suggested that the changes in responses to TMS, divergent... from those in ongoing voluntary EMG during the sustained 60% MVC, indicate complex processes at levels preceding the motor cortex output cells in an attempt to maintain a submaximal contraction of the fatigued muscle. The increase in MEP magnitude after the sustained 60% MVC may indicate residual changes in cortical activity after fatiguing contraction.

Keywords:
muscle fatigue / transcranial magnetic stimulation / motor cortex
Source:
Electromyography & Motor Control-Electroencephalography & Clinical Neurophysiology, 1996, 101, 4, 281-288
Publisher:
  • Elsevier Ireland Ltd, Clare

DOI: 10.1016/0924-980X(96)95627-1

ISSN: 0924-980X

PubMed: 8761037

WoS: A1996VC98300003

Scopus: 2-s2.0-0030221965
[ Google Scholar ]
46
43
URI
http://rimi.imi.bg.ac.rs/handle/123456789/24
Collections
  • Radovi istraživača / Researchers' publications
Institution/Community
Institut za medicinska istraživanja
TY  - JOUR
AU  - Ljubisavljević, Miloš
AU  - Milanović, Slađan
AU  - Radovanović, S
AU  - Vukcević, I
AU  - Kostić, V
AU  - Anastasijević, R
PY  - 1996
UR  - http://rimi.imi.bg.ac.rs/handle/123456789/24
AB  - Changes in responses to transcranial magnetic stimulation (TMS) during submaximal isometric voluntary contraction (60% of maximal voluntary contraction (MVC)) of the adductor pollicis muscle and the subsequent recovery period have been studied in healthy volunteers. TMS at twice the motor threshold was applied during the sustained contraction, as well as at rest and during shortlasting (2 s) 60% MVCs before and immediately after the sustained contraction, and at 5 min intervals during the recovery period. Both motor evoked potential (MEP) magnitude (peak and area) and silent period (SP) duration in electromyographic activity (EMG) of the adductor pollicis muscle showed a gradual decrease up to the endurance point and an increase thereafter. MEPs elicited at rest immediately after the fatiguing contraction were larger, whereas those elicited later on during the recovery period did not differ significantly from the controls. It is suggested that the changes in responses to TMS, divergent from those in ongoing voluntary EMG during the sustained 60% MVC, indicate complex processes at levels preceding the motor cortex output cells in an attempt to maintain a submaximal contraction of the fatigued muscle. The increase in MEP magnitude after the sustained 60% MVC may indicate residual changes in cortical activity after fatiguing contraction.
PB  - Elsevier Ireland Ltd, Clare
T2  - Electromyography & Motor Control-Electroencephalography & Clinical Neurophysiology
T1  - Central changes in muscle fatigue during sustained submaximal isometric voluntary contraction as revealed by transcranial magnetic stimulation
EP  - 288
IS  - 4
SP  - 281
VL  - 101
DO  - 10.1016/0924-980X(96)95627-1
UR  - conv_5010
ER  - 
@article{
author = "Ljubisavljević, Miloš and Milanović, Slađan and Radovanović, S and Vukcević, I and Kostić, V and Anastasijević, R",
year = "1996",
abstract = "Changes in responses to transcranial magnetic stimulation (TMS) during submaximal isometric voluntary contraction (60% of maximal voluntary contraction (MVC)) of the adductor pollicis muscle and the subsequent recovery period have been studied in healthy volunteers. TMS at twice the motor threshold was applied during the sustained contraction, as well as at rest and during shortlasting (2 s) 60% MVCs before and immediately after the sustained contraction, and at 5 min intervals during the recovery period. Both motor evoked potential (MEP) magnitude (peak and area) and silent period (SP) duration in electromyographic activity (EMG) of the adductor pollicis muscle showed a gradual decrease up to the endurance point and an increase thereafter. MEPs elicited at rest immediately after the fatiguing contraction were larger, whereas those elicited later on during the recovery period did not differ significantly from the controls. It is suggested that the changes in responses to TMS, divergent from those in ongoing voluntary EMG during the sustained 60% MVC, indicate complex processes at levels preceding the motor cortex output cells in an attempt to maintain a submaximal contraction of the fatigued muscle. The increase in MEP magnitude after the sustained 60% MVC may indicate residual changes in cortical activity after fatiguing contraction.",
publisher = "Elsevier Ireland Ltd, Clare",
journal = "Electromyography & Motor Control-Electroencephalography & Clinical Neurophysiology",
title = "Central changes in muscle fatigue during sustained submaximal isometric voluntary contraction as revealed by transcranial magnetic stimulation",
pages = "288-281",
number = "4",
volume = "101",
doi = "10.1016/0924-980X(96)95627-1",
url = "conv_5010"
}
Ljubisavljević, M., Milanović, S., Radovanović, S., Vukcević, I., Kostić, V.,& Anastasijević, R.. (1996). Central changes in muscle fatigue during sustained submaximal isometric voluntary contraction as revealed by transcranial magnetic stimulation. in Electromyography & Motor Control-Electroencephalography & Clinical Neurophysiology
Elsevier Ireland Ltd, Clare., 101(4), 281-288.
https://doi.org/10.1016/0924-980X(96)95627-1
conv_5010
Ljubisavljević M, Milanović S, Radovanović S, Vukcević I, Kostić V, Anastasijević R. Central changes in muscle fatigue during sustained submaximal isometric voluntary contraction as revealed by transcranial magnetic stimulation. in Electromyography & Motor Control-Electroencephalography & Clinical Neurophysiology. 1996;101(4):281-288.
doi:10.1016/0924-980X(96)95627-1
conv_5010 .
Ljubisavljević, Miloš, Milanović, Slađan, Radovanović, S, Vukcević, I, Kostić, V, Anastasijević, R, "Central changes in muscle fatigue during sustained submaximal isometric voluntary contraction as revealed by transcranial magnetic stimulation" in Electromyography & Motor Control-Electroencephalography & Clinical Neurophysiology, 101, no. 4 (1996):281-288,
https://doi.org/10.1016/0924-980X(96)95627-1 .,
conv_5010 .

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