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Type: Journal article
Title: Motor cortex excitability does not increase during sustained cycling exercise to volitional exhaustion
Author: Sidhu, S.
Cresswell, A.
Carroll, T.
Citation: Journal of Applied Physiology, 2012; 113(3):401-409
Publisher: American Physiological Society
Issue Date: 2012
ISSN: 8750-7587
Statement of
Simranjit K. Sidhu, Andrew G. Cresswell, and Timothy J. Carroll
Abstract: The excitability of the motor cortex increases as fatigue develops during sustained single-joint contractions, but there are no previous reports on how corticospinal excitability is affected by sustained locomotor exercise. Here we addressed this issue by measuring spinal and cortical excitability changes during sustained cycling exercise. Vastus lateralis (VL) and rectus femoris (RF) muscle responses to transcranial magnetic stimulation of the motor cortex (motor evoked potentials, MEPs) and electrical stimulation of the descending tracts (cervicomedullary evoked potentials, CMEPs) were recorded every 3 min from nine subjects during 30 min of cycling at 75% of maximum workload (Wmax), and every minute during subsequent exercise at 105% of Wmax until subjective task failure. Responses were also measured during nonfatiguing control bouts at 80% and 110% of Wmax prior to sustained exercise. There were no significant changes in MEPs or CMEPs (P > 0.05) during the sustained cycling exercise. These results suggest that, in contrast to sustained single-joint contractions, sustained cycling exercise does not increase the excitability of motor cortical neurons. The contrasting corticospinal responses to the two modes of exercise may be due to differences in their associated systemic physiological consequences.
Keywords: central fatigue
endurance exercise
Rights: Copyright © 2012 the American Physiological Society
DOI: 10.1152/japplphysiol.00486.2012
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