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Article Dans Une Revue Journal of Neurophysiology Année : 2021

Reductions in motoneuron excitability during sustained isometric contractions are dependent on stimulus and contraction intensity

Loïc Espeit
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Nicolas Royer
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Paul Ansdell
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Jakob Škarabot
Thomas Lapole
Guillaume Millet

Résumé

This study measured motoneuron excitability using cervicomedullary evoked potentials conditioned using transcranial magnetic stimulation (TMS-CMEPs) of both small and large amplitudes during sustained low- and high-intensity contractions of the elbow flexors. During the low-intensity task, only the small TMS-CMEP was reduced. During the high-intensity task, both small and large TMS-CMEPs were substantially reduced. These results indicate that repetitively active motoneurons are specifically reduced in excitability compared with less active motoneurons in the same pool.

Dates et versions

hal-03467161 , version 1 (06-12-2021)

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Citer

Callum Brownstein, Loïc Espeit, Nicolas Royer, Paul Ansdell, Jakob Škarabot, et al.. Reductions in motoneuron excitability during sustained isometric contractions are dependent on stimulus and contraction intensity. Journal of Neurophysiology, 2021, 125 (5), pp.1636-1646. ⟨10.1152/jn.00070.2021⟩. ⟨hal-03467161⟩
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