The influence of a single bout of aerobic exercise on short-interval intracortical excitability

Regular physical activity can have positive effects on brain function and plasticity. Indeed, there is some limited evidence that even a single bout of exercise may promote plasticity within the cortex. However, the mechanisms by which exercise acutely promotes plasticity are not clear. To further e...

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Veröffentlicht in:	Experimental brain research Jg. 232; H. 6; S. 1875 - 1882
Hauptverfasser:	Smith, Ashleigh E., Goldsworthy, Mitchell R., Garside, Tessa, Wood, Fiona M., Ridding, Michael C.
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	Berlin/Heidelberg Springer Berlin Heidelberg 01.06.2014 Springer Springer Nature B.V
Schlagworte:	Adult Aerobic exercise Aerobic exercises Aerobics Analysis of Variance Bicycles Biological and medical sciences Biomedical and Life Sciences Biomedicine Brain Brain research Brain-derived neurotrophic factor Changes Conditioning Cortex Electromyography Evoked Potentials, Motor - physiology Exercise Exercise - physiology Experiments Female Females Fundamental and applied biological sciences. Psychology Heart rate Humans Inhibition Magnetic brain stimulation Male Metabolism Middle Aged Motor Cortex - physiology Neural Inhibition Neurology Neuroplasticity Neurosciences Physical activity Physical fitness Physiological aspects Plasticity Questionnaires Research Article Resting Stimulus Surveys and Questionnaires Thresholds Time Factors Transcranial magnetic stimulation Transcranial Magnetic Stimulation - methods Vertebrates: nervous system and sense organs Young Adult Australia GABA Transcranial magnetic stimulation Short-interval intracortical inhibition Physical activity Motor cortex Physical exercise Motor pathway Central nervous system Excitability Encephalon
ISSN:	0014-4819, 1432-1106, 1432-1106
Online-Zugang:	Volltext
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Zusammenfassung:	Regular physical activity can have positive effects on brain function and plasticity. Indeed, there is some limited evidence that even a single bout of exercise may promote plasticity within the cortex. However, the mechanisms by which exercise acutely promotes plasticity are not clear. To further explore the effects of acute exercise on cortical function, we examined whether a single bout of exercise was associated with changes in cortical excitability and inhibition. Using standard techniques, cortical stimulus–response curves [90 % resting motor threshold (RMT)–150 % RMT] were investigated in nine subjects (four females, 31.1 ± 11.7 years) and short-interval intracortical inhibition (SICI) [interstimulus interval 2 ms and 3 ms, conditioning intensities of 80 % active motor threshold (AMT) and 90 % AMT] in 13 subjects (six females, 28.4 ± 5.1 years) before and at 0 and 15 min following 30 min of ergometer cycling at low–moderate or moderate–high intensity. There were no changes in cortical excitability following exercise but less SICI at both 0 and 15 min post-exercise ( F [2, 24] = 7.7, P = 0.003). These findings show that a short period of exercise can transiently reduce SICI. Such a change in inhibition after exercise may contribute to the development of a cortical environment that would be more optimal for plasticity and may partially explain previous findings of enhanced neuroplasticity following low-intensity exercise.
Bibliographie:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 14 ObjectType-Article-1 ObjectType-Feature-2 content type line 23
ISSN:	0014-4819 1432-1106 1432-1106
DOI:	10.1007/s00221-014-3879-z