Modulation of soleus corticospinal excitability during Achilles tendon vibration

Lapole, Thomas, Temesi, John, Arnal, Pierrick, Gimenez, Philippe, Petitjean, Michel and Millet, Guillaume (2015) Modulation of soleus corticospinal excitability during Achilles tendon vibration. Experimental Brain Research, 233 (9). pp. 2655-2662. ISSN 0014-4819

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Abstract

Soleus (SOL) corticospinal excitability has been reported to increase during Achilles tendon vibration. The aim of the present study was to further investigate SOL corticospinal excitability and elucidate the changes to intracortical mechanisms during Achilles tendon vibration. Motor-evoked potentials (MEPs) were elicited in the SOL by transcranial magnetic stimulation (TMS) of the corresponding motor cortical area of the leg with and without 50-Hz Achilles tendon vibration. SOL input–output curves were determined. Paired-pulse protocols were also performed to investigate short-interval intracortical inhibition (SICI) and intracortical facilitation (ICF) by conditioning test TMS pulses with sub-threshold TMS pulses at inter-stimulus intervals of 3 and 13 ms, respectively. During Achilles tendon vibration, motor threshold was lower than in the control condition (43 ± 13 vs. 49 ± 11 % of maximal stimulator output; p = 0.008). Input–output curves were also influenced by vibration, i.e. there was increased maximal MEP amplitude (0.694 ± 0.347 vs. 0.268 ± 0.167 mV; p < 0.001), decreased TMS intensity to elicit a MEP of half the maximal MEP amplitude (100 ± 13 vs. 109 ± 9 % motor threshold; p = 0.009) and a strong tendency for decreased slope constant (0.076 ± 0.04 vs. 0.117 ± 0.04; p = 0.068). Vibration reduced ICF (98 ± 61 vs. 170 ± 105 % of test MEP amplitude; p = 0.05), but had no effect on SICI (53 ± 26 vs. 48 ± 22 % of test MEP amplitude; p = 0.68). The present results further document the increased vibration-induced corticospinal excitability in the soleus muscle and suggest that this increase is not mediated by changes in SICI or ICF.

Item Type:	Article
Uncontrolled Keywords:	Vibration, TMS, Motor-evoked potentials, Soleus, Intracortical circuits
Subjects:	B100 Anatomy, Physiology and Pathology C600 Sports Science
Department:	Faculties > Health and Life Sciences > Sport, Exercise and Rehabilitation
Depositing User:	Becky Skoyles
Date Deposited:	14 Sep 2018 11:35
Last Modified:	11 Oct 2019 19:15
URI:	http://nrl.northumbria.ac.uk/id/eprint/35721

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