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Experimental Brain Research : Volume 235

Experimental Brain Research : Volume 234

Experimental Brain Research : Volume 234, Issue 12, December 2016

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Acute aerobic exercise modulates primary motor cortex inhibition

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Acute aerobic exercise modulates primary motor cortex inhibition

Content Provider	Springer Nature Link
Author	Mooney, Ronan A. Coxon, James P. Cirillo, John Glenny, Helen Gant, Nicholas Byblow, Winston D.
Copyright Year	2016
Abstract	Aerobic exercise can enhance neuroplasticity although presently the neural mechanisms underpinning these benefits remain unclear. One possible mechanism is through effects on primary motor cortex (M1) function via down-regulation of the inhibitory neurotransmitter gamma-aminobutyric acid (GABA). The aim of the present study was to examine how corticomotor excitability (CME) and M1 intracortical inhibition are modulated in response to a single bout of moderate intensity aerobic exercise. Ten healthy right-handed adults were participants. Single- and paired-pulse transcranial magnetic stimulation was applied over left M1 to obtain motor-evoked potentials in the right flexor pollicis brevis. We examined CME, cortical silent period (SP) duration, short- and long-interval intracortical inhibition (SICI, LICI), and late cortical disinhibition (LCD), before and after acute aerobic exercise (exercise session) or an equivalent duration without exercise (control session). Aerobic exercise was performed on a cycle ergometer for 30 min at a workload equivalent to 60 % of maximal cardiorespiratory fitness (VO2 peak; heart rate reserve = 75 ± 3 %, perceived exertion = 13.5 ± 0.7). LICI was reduced at 10 (52 ± 17 %, P = 0.03) and 20 min (27 ± 8 %, P = 0.03) post-exercise compared to baseline (13 ± 4 %). No significant changes in CME, SP duration, SICI or LCD were observed. The present study shows that GABAB-mediated intracortical inhibition may be down-regulated after acute aerobic exercise. The potential effects this may have on M1 plasticity remain to be determined.
Starting Page	3669
Ending Page	3676
Page Count	8
File Format	PDF
ISSN	00144819
Journal	Experimental Brain Research
Volume Number	234
Issue Number	12
e-ISSN	14321106
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-09-02
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Aerobic exercise Transcranial magnetic stimulation Motor cortex Intracortical inhibition Neurosciences Neurology
Content Type	Text
Resource Type	Article
Subject	Neuroscience

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