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Changes in corticospinal excitability during the preparation phase of ballistic and ramp contractions.

par Baudry, Stéphane ;Duchateau, Jacques
Référence Journal of physiology
Publication Publié, 2021-01-01

Article révisé par les pairs

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Résumé :

Changes in corticospinal excitability prior to a contraction may depend on its characteristics, including the rate of torque development. This study compared the specific modulation of cortical and spinal excitability during the preparation phase (last 500 ms before contraction) of fast (ballistic; BAL) and ramp (RAMP) contractions of ankle dorsiflexors, using transcranial magnetic stimulation and peripheral nerve stimulation. The results indicate earlier changes at cortical than spinal level during the preparation phase of both contraction types. However, these adjustments are delayed prior to BAL relative to RAMP contractions. This study suggests that the time course of change in cortical and spinal excitability during the preparation phase of a voluntary action is specific to the intended rate of torque development of the upcoming contraction.