Article (Scientific journals)
Facilitation of Responses to Motor Cortex Stimulation: Effects of Isometric Voluntary Contraction
Maertens De Noordhout, Alain; PEPIN, Jean-Louis; GERARD, Pascale et al.
1992In Annals of Neurology, 32 (3), p. 365-70
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Keywords :
Adult; Electromyography; Female; Humans; Isometric Contraction/physiology; Magnetics; Male; Middle Aged; Motor Cortex/physiology; Reaction Time; Reflex/physiology; Vibration; Volition
Abstract :
[en] In 7 normal subjects we compared the facilitatory effect of isometric contraction of the tibialis anterior on the size of electromyographic responses evoked in this muscle by electric stimuli applied over the cervical column and by electric and magnetic percutaneous stimulation of the motor cortex. No significant difference was found between the degrees of facilitation of the responses to any of the stimuli. Using collision techniques, we also showed that the pyramidal fibers activated by spinal and cortical stimuli are the same. Facilitation induced by isometric contraction (20% maximum) was of similar or greater magnitude than that found with constant vibration of the tendon of the target muscle. In cases where vibration and contraction had equal facilitatory effects, there was no further facilitation of the responses when both conditions were applied together. These findings indicate that the facilitatory effect of isometric contraction of the target muscle essentially originates at a spinal level rather than in the motor cortex.
Disciplines :
Neurology
Author, co-author :
Maertens De Noordhout, Alain  ;  Centre Hospitalier Universitaire de Liège - CHU > Neurologie CHR
PEPIN, Jean-Louis ;  Centre Hospitalier Universitaire de Liège - CHU > Neurologie CHR
GERARD, Pascale ;  Centre Hospitalier Universitaire de Liège - CHU > Neurologie CHR
Delwaide, Paul ;  Université de Liège - ULiège > Services généraux (Faculté de médecine) > Relations académiques et scientifiques (Médecine)
Language :
English
Title :
Facilitation of Responses to Motor Cortex Stimulation: Effects of Isometric Voluntary Contraction
Publication date :
1992
Journal title :
Annals of Neurology
ISSN :
0364-5134
eISSN :
1531-8249
Publisher :
Wiley Liss, New York, United States - New York
Volume :
32
Issue :
3
Pages :
365-70
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 28 December 2011

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