Neural adaptations associated with interlimb transfer in a ballistic wrist flexion task

Ruddy, Kathy L., Rudolf, Anne K., Kalkman, Barbara, King, Maedbh, Daffertshofer, Andreas, Carroll, Timothy J. and Carson, Richard G. (2016) Neural adaptations associated with interlimb transfer in a ballistic wrist flexion task. Frontiers in Human Neuroscience, 10 204: 1-18. doi:10.3389/fnhum.2016.00204


Author Ruddy, Kathy L.
Rudolf, Anne K.
Kalkman, Barbara
King, Maedbh
Daffertshofer, Andreas
Carroll, Timothy J.
Carson, Richard G.
Title Neural adaptations associated with interlimb transfer in a ballistic wrist flexion task
Journal name Frontiers in Human Neuroscience   Check publisher's open access policy
ISSN 1662-5161
Publication date 2016-05-03
Year available 2016
Sub-type Article (original research)
DOI 10.3389/fnhum.2016.00204
Open Access Status DOI
Volume 10
Issue 204
Start page 1
End page 18
Total pages 18
Place of publication Lausanne, Switzerland
Publisher Frontiers Research Foundation
Collection year 2017
Language eng
Abstract Cross education is the process whereby training of one limb gives rise to increases in the subsequent performance of its opposite counterpart. The execution of many unilateral tasks is associated with increased excitability of corticospinal projections from primary motor cortex (M1) to the opposite limb. It has been proposed that these effects are causally related. Our aim was to establish whether changes in corticospinal excitability (CSE) arising from prior training of the opposite limb determine levels of interlimb transfer. We used three vision conditions shown previously to modulate the excitability of corticospinal projections to the inactive (right) limb during wrist flexion movements performed by the training (left) limb. These were: (1) mirrored visual feedback of the training limb; (2) no visual feedback of either limb; and (3) visual feedback of the inactive limb. Training comprised 300 discrete, ballistic wrist flexion movements executed as rapidly as possible. Performance of the right limb on the same task was assessed prior to, at the mid point of, and following left limb training. There was no evidence that variations in the excitability of corticospinal projections (assessed by transcranial magnetic stimulation (TMS)) to the inactive limb were associated with, or predictive of, the extent of interlimb transfer that was expressed. There were however associations between alterations in muscle activation dynamics observed for the untrained limb, and the degree of positive transfer that arose from training of the opposite limb. The results suggest that the acute adaptations that mediate the bilateral performance gains realized through unilateral practice of this ballistic wrist flexion task are mediated by neural elements other than those within M1 that are recruited at rest by single-pulse TMS.
Keyword Cross education
Contralateral adaptations
Corticospinal
Primary motor cortex
Mirror training
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Human Movement and Nutrition Sciences Publications
 
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