Increases in corticospinal responsiveness during a sustained submaximal plantar flexion

Article


Hoffman, B. W., Oya, T., Carroll, T. J. and Cresswell, A. G.. 2009. "Increases in corticospinal responsiveness during a sustained submaximal plantar flexion." Journal of Applied Physiology. 107 (1), pp. 112-120. https://doi.org/10.1152/japplphysiol.91541.2008
Article Title

Increases in corticospinal responsiveness during a sustained submaximal plantar flexion

ERA Journal ID3161
Article CategoryArticle
AuthorsHoffman, B. W. (Author), Oya, T. (Author), Carroll, T. J. (Author) and Cresswell, A. G. (Author)
Journal TitleJournal of Applied Physiology
Journal Citation107 (1), pp. 112-120
Number of Pages9
Year2009
PublisherAmerican Physiological Society
Place of PublicationUnited States
ISSN1522-1601
8750-7587
Digital Object Identifier (DOI)https://doi.org/10.1152/japplphysiol.91541.2008
Web Address (URL)https://journals.physiology.org/doi/full/10.1152/japplphysiol.91541.2008
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 (similar to 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.

Keywordslower limb; central nervous system; muscle; transcranial magnetic stimulation; electromyogram
ANZSRC Field of Research 2020420701. Biomechanics
420703. Motor control
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Byline AffiliationsUniversity of Queensland
Institution of OriginUniversity of Southern Queensland
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