Ipsilateral corticospinal responses to ballistic training are similar for various intensities and timings of TMS

E Poh; Stephan Riek; T J Carroll

doi:10.1111/apha.12032

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Ipsilateral corticospinal responses to ballistic training are similar for various intensities and timings of TMS

Journal article

Peer reviewed

Ipsilateral corticospinal responses to ballistic training are similar for various intensities and timings of TMS

E Poh, Stephan Riek and T J Carroll

Acta Physiologica, Vol.207(2), pp.385-396

2013

DOI: https://doi.org/10.1111/apha.12032

PMID: 23082845

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https://doi.org/10.1111/apha.12032View

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Abstract

Transcranial Magnetic Stimulation

Young Adult

Learning - physiology

Movement - physiology

Evoked Potentials, Motor - physiology

Humans

Female

Male

Electromyography

Functional Laterality - physiology

Pyramidal Tracts - physiology

In previous studies, unilateral ballistic training either increased or decreased corticospinal excitability for the untrained opposite limb. The objective here was to investigate whether these discrepancies can be explained by methodological differences such as the intensity of stimulation assessing excitability or the timing of excitability testing after training. Motor evoked potentials (MEP) were elicited by stimulating the ipsilateral cortex at high intensity (70% MEPmax) and low intensity (20% MEPmax) at specific time-points after performance of 300 ballistic movements of the index finger. Ballistic practice significantly facilitated MEP size for high-intensity stimuli, whereas responses to low-intensity stimulation were variable. MEP sizes at individual time-points were not significantly facilitated until 4 min after training, although there was no difference between early and late responses when grouped over multiple time-points. The data indicate that previous discrepancies in ipsilateral responses to ballistic training cannot be attributed to specific procedures used to assess corticospinal excitability as there was no tendency towards depression of MEP amplitude at any point post-exercise for both testing intensities. This suggests that other experimental factors such as locus of attention or availability of visual feedback are more likely to account for the discrepancies.

Details

Title: Ipsilateral corticospinal responses to ballistic training are similar for various intensities and timings of TMS
Authors: E Poh (Author) - University of Queensland
Stephan Riek (Author) - University of Queensland
T J Carroll (Author) - University of Queensland
Publication details: Acta Physiologica, Vol.207(2), pp.385-396
Publisher: Wiley-Blackwell Publishing Ltd.
DOI: 10.1111/apha.12032
ISSN: 1748-1716
PMID: 23082845
Organisation Unit: University of the Sunshine Coast, Queensland; Graduate Research School
Language: English
Record Identifier: 99472605002621
Output Type: Journal article

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