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Cross-activation of the motor cortex during unilateral contractions of the quadriceps

Hendy, Ashlee M., Chye, Lilian and Teo, Wei-Peng 2017, Cross-activation of the motor cortex during unilateral contractions of the quadriceps, Frontiers in human neuroscience, vol. 11, pp. 1-11, doi: 10.3389/fnhum.2017.00397.

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Title Cross-activation of the motor cortex during unilateral contractions of the quadriceps
Author(s) Hendy, Ashlee M.
Chye, Lilian
Teo, Wei-PengORCID iD for Teo, Wei-Peng orcid.org/0000-0003-3929-9778
Journal name Frontiers in human neuroscience
Volume number 11
Article ID 397
Start page 1
End page 11
Total pages 11
Publisher Frontiers Research Foundation
Place of publication Lausanne, Switzerland
Publication date 2017
ISSN 1662-5161
Keyword(s) bilateral-transfer
cross-education
motor evoked potential
quadriceps
transcranial magnetic stimulation
Summary Transcranial magnetic stimulation (TMS) studies have demonstrated that unilateral muscle contractions in the upper limb produce motor cortical activity in both the contralateral and ipsilateral motor cortices. The increase in excitability of the corticomotor pathway activating the resting limb has been termed "cross-activation", and is of importance due to its involvement in cross-education and rehabilitation. To date, very few studies have investigated cross-activation in the lower limb. Sixteen healthy participants (mean age 29 ± 9 years) took part in this study. To determine the effect of varying contraction intensities in the lower limb, we investigated corticomotor excitability and intracortical inhibition of the right rectus femoris (RF) while the left leg performed isometric extension at 0%, 25%, 50%, 75% and 100% of maximum force output. Contraction intensities of 50% maximal force output and greater produced significant cross-activation of the corticomotor pathway. A reduction in silent period duration was observed during 75% and 100% contractions, while the release of short-interval intracortical inhibition (SICI) was only observed during maximal (100%) contractions. We conclude that increasing isometric contraction intensities produce a monotonic increase in cross-activation, which was greatest during 100% force output. Unilateral training programs designed to induce cross-education of strength in the lower limb should therefore be prescribed at the maximal intensity tolerable.
Language eng
DOI 10.3389/fnhum.2017.00397
Field of Research 110699 Human Movement and Sports Science not elsewhere classified
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2017, The Authors
Free to Read? Yes
Persistent URL http://hdl.handle.net/10536/DRO/DU:30105113

Document type: Journal Article
Collections: School of Exercise and Nutrition Sciences
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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.