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- W2536123395 abstract "To investigate the influence of group III/IV muscle afferents on the development of central fatigue and corticospinal excitability during exercise.Fourteen males performed cycling-exercise both under control-conditions (CTRL) and with lumbar intrathecal fentanyl (FENT) impairing feedback from leg muscle afferents. Transcranial magnetic- and cervicomedullary stimulation was used to monitor cortical versus spinal excitability.While fentanyl-blockade during non-fatiguing cycling had no effect on motor-evoked potentials (MEPs), cervicomedullary-evoked motor potentials (CMEPs) were 13±3% higher (P<0.05), resulting in a decrease in MEP/CMEP (P<0.05). Although the pre- to post-exercise reduction in resting twitch was greater in FENT vs. CTRL (-53±3% vs. -39±3%; P<0.01), the reduction in voluntary muscle activation was smaller (-2±2% vs. -10±2%; P<0.05). Compared to the start of fatiguing exercise, MEPs and CMEPs were unchanged at exhaustion in CTRL. In contrast, MEPs and MEP/CMEP increased 13±3% and 25±6% in FENT (P<0.05).During non-fatiguing exercise, group III/IV muscle afferents disfacilitate, or inhibit, spinal motoneurons and facilitate motor cortical cells. In contrast, during exhaustive exercise, group III/IV muscle afferents disfacilitate/inhibit the motor cortex and promote central fatigue.Group III/IV muscle afferents influence corticospinal excitability and central fatigue during whole-body exercise in humans." @default.
- W2536123395 created "2016-10-28" @default.
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- W2536123395 date "2017-01-01" @default.
- W2536123395 modified "2023-10-17" @default.
- W2536123395 title "Group III/IV locomotor muscle afferents alter motor cortical and corticospinal excitability and promote central fatigue during cycling exercise" @default.
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- W2536123395 doi "https://doi.org/10.1016/j.clinph.2016.10.008" @default.
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- W2536123395 hasPublicationYear "2017" @default.
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