Corticospinal-evoked responses in lower limb muscles during voluntary contractions at varying strengths

Article


Oya, T., Hoffman, B. W. and Cresswell, A. G.. 2008. "Corticospinal-evoked responses in lower limb muscles during voluntary contractions at varying strengths." Journal of Applied Physiology. 105 (5), pp. 1527-1532. https://doi.org/10.1152/japplphysiol.90586.2008
Article Title

Corticospinal-evoked responses in lower limb muscles during voluntary contractions at varying strengths

ERA Journal ID3161
Article CategoryArticle
AuthorsOya, T. (Author), Hoffman, B. W. (Author) and Cresswell, A. G. (Author)
Journal TitleJournal of Applied Physiology
Journal Citation105 (5), pp. 1527-1532
Number of Pages6
Year2008
PublisherAmerican Physiological Society
Place of PublicationUnited States
ISSN1522-1601
8750-7587
Digital Object Identifier (DOI)https://doi.org/10.1152/japplphysiol.90586.2008
Web Address (URL)https://journals.physiology.org/doi/full/10.1152/japplphysiol.90586.2008
Abstract

This study investigated corticospinal-evoked responses in lower limb muscles during voluntary contractions at varying strengths. Similar investigations have been made on upper limb muscles, where evoked responses have been shown to increase up to similar to 50% of maximal force and then decline. We elicited motor-evoked potentials (MEPs) and cervicomedullary motor-evoked potentials (CMEPs) in the soleus (Sol) and medial gastrocnemius (MG) muscles using magnetic stimulation over the motor cortex and cervicomedullary junction during voluntary plantar flexions with the torque ranging from 0 to 100% of a maximal voluntary contraction. Differences between the MEP and CMEP were also investigated to assess whether any changes were occurring at the cortical or spinal levels. In both Sol and MG, MEP and CMEP amplitudes [normalized to maximal M wave (M-max)] showed an increase, followed by a plateau, over the greater part of the contraction range with responses increasing from similar to 0.2 to similar to 6% of M-max for Sol and from similar to 0.3 to similar to 10% of M-max for MG. Because both MEPs and CMEPs changed in a similar manner, the observed increase and lack of decrease at high force levels are likely related to underlying changes occurring at the spinal level. The evoked responses in the Sol and MG increase over a greater range of contraction strengths than for upper limb muscles, probably due to differences in the pattern of motor unit recruitment and rate coding for these muscles and the strength of the corticospinal input.

Keywordstranscranial magnetic stimulation; electromyography; motor system
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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