Cortical motor output decreases after neuromuscular fatigue induced by electrical stimulation of the plantar flexor muscles

Acta Physiologica
F AlexandreA Varray

Abstract

Neuromuscular electrical stimulation (NMES) causes early onset of neuromuscular fatigue. Peripheral electrophysiological explorations suggest that supra-spinal alterations are involved through sensitive afferent pathways. As sensory input is projected over the primary somatosensory cortex (S1), S1 area involvement in inhibiting the central motor drive can be hypothesized. This study assessed cortical activity under a fatiguing NMES protocol at low frequency. Twenty healthy males performed five NMES sequences of 17 trains over the plantar flexors (30 Hz, 4 s on/6 s off). Before and after each sequence, neuromuscular tests composed of maximal voluntary contractions (MVCs) were carried out. Cortical activity was assessed during MVCs with functional near-infrared spectroscopy over S1 and primary motor (M1) areas, through oxy- [HbO] and deoxy-haemoglobin [HbR] variation. Electrophysiological data (H-reflex during MVC, EMG activity and level of voluntary activation) were also recorded. MVC torque significantly decreased after the first 17 NMES trains (P < 0.001). The electrophysiological data were consistent with supra-spinal alterations. In addition, [HbO] declined significantly during the protocol over the S1 and M1 areas from the ...Continue Reading

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Citations

Aug 15, 2019·Journal of Neurophysiology·Gerard DerosiereJulie Duque
Jan 22, 2020·The Neuroscientist : a Review Journal Bringing Neurobiology, Neurology and Psychiatry·Gerard Derosiere, Julie Duque
Nov 24, 2017·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Maria Vromans, Pouran D Faghri
Mar 18, 2021·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Fabio Giuseppe LaginestraMassimo Venturelli

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