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Increases in corticospinal responsiveness during a sustained submaximal plantar flexion.

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Increases in corticospinal responsiveness during a sustained submaximal plantar flexion.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Hoffman, B. W. Oya, T. Carroll, T. J. Cresswell, A. G.
Description	Country affiliation: Australia Author Affiliation: Hoffman BW ( School of Human Movement Studies, Univ. of Queensland, QLD 4072, Australia.)
Abstract	Studying the responsiveness of specific central nervous system pathways to electrical or magnetic stimulation can provide important information regarding fatigue processes in the central nervous system. We investigated the changes in corticospinal responsiveness during a sustained submaximal contraction of the triceps surae. Comparisons were made between the size of motor-evoked potentials (MEPs) elicited by motor cortical stimulation and cervicomedullary motor-evoked potentials (CMEPs) elicited by magnetic stimulation of the descending tracts to determine the site of any change in corticospinal responsiveness. Participants maintained an isometric contraction of triceps surae at 30% of maximal voluntary contraction (MVC) for as long as possible on two occasions. Stimulation was applied to the motor cortex or the cervicomedullary junction at 1-min intervals during contraction until task failure. Peripheral nerve stimulation was also applied to evoke maximal M waves (M(max)) and a superimposed twitch. Additionally, MEPs and CMEPs were evoked during brief contractions at 80%, 90%, and 100% of MVC as a nonfatigue control. During the sustained contractions, MEP amplitude increased significantly in soleus (113%) and medial gastrocnemius (108%) muscles and, at task failure, matched MEP amplitude in the prefatigue MVC ( approximately 20-25% M(max)). In contrast, CMEP amplitude increased significantly in medial gastrocnemius (51%), but not in soleus (63%) muscle and, at task failure, was significantly smaller than during prefatigue MVC (5-6% M(max) vs. 11-13% M(max)). The data indicate that cortical processes contribute substantially to the increase in corticospinal responsiveness during sustained submaximal contraction of triceps surae.
File Format	HTM / HTML
ISSN	87507587
e-ISSN	15221601
Journal	Journal of Applied Physiology
Issue Number	1
Volume Number	107
Language	English
Publisher	American Physiological Society
Publisher Date	2009-07-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Discipline Physiology Evoked Potentials, Motor Physiology Isometric Contraction Motor Cortex Muscle Fatigue Muscle, Skeletal Pyramidal Tracts Electric Stimulation Electromyography Lower Extremity Transcranial Magnetic Stimulation
Content Type	Text
Resource Type	Article
Subject	Physiology Physiology (medical) Sports Science

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