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Fumio Miyazaki - One of the best experts on this subject based on the ideXlab platform.

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Dawson J. Kidgell - One of the best experts on this subject based on the ideXlab platform.

  • Modulation of intracortical inhibition and excitation in agonist and Antagonist Muscles following acute strength training
    European Journal of Applied Physiology, 2019
    Co-Authors: Joel Mason, Shapour Jaberzadeh, Glyn Howatson, Ashlyn K. Frazer, Alan J. Pearce, Janne Avela, Dawson J. Kidgell
    Abstract:

    Purpose Transcranial magnetic stimulation (TMS) usually investigates the corticospinal responses of the agonist Muscle to strength training, despite the role of the Antagonist Muscle in strength development. We examined the intracortical responses from an agonist and Antagonist Muscle following a single session of heavy-loaded strength training (dominant-arm only) to identify the early Antagonistic responses to a single session that may accompany improvements in strength. Methods Corticospinal and motor cortical excitability and inhibition was collected from agonist and Antagonist Muscles prior to and following a single session of heavy-loaded wrist flexor training in 18 individuals. Training consisted of four sets 6–8 repetitions at 80% of 1-repetition maximum (1-RM). Recruitment curves for corticospinal excitability and inhibition of the right wrist flexor and wrist extensor Muscles were constructed and assessed by examining the area under the recruitment curve. Intracortical measures were obtained using paired-pulse TMS. Results Following a single training session, increases in corticospinal excitability were observed in both the agonist and Antagonist Muscles. This was accompanied by decreases in corticospinal inhibition in both Muscles. Intracortical inhibition was reduced and intracortical facilitation was increased for the agonist Muscle only. Intracortical measures in the Antagonist Muscle remained unchanged after training. Conclusions These findings indicate that the corticospinal responses to a single session of strength training are similar between agonist and Antagonist Muscles, but the intrinsic cortico-cortical circuitry of the Antagonist remains unchanged. The corticospinal responses are likely due to increased involvement/co-activation of the Antagonist Muscle during training as the agonist Muscle fatigues.

  • Modulation of intracortical inhibition and excitation in agonist and Antagonist Muscles following acute strength training
    European journal of applied physiology, 2019
    Co-Authors: Joel Mason, Shapour Jaberzadeh, Glyn Howatson, Ashlyn K. Frazer, Alan J. Pearce, Janne Avela, Dawson J. Kidgell
    Abstract:

    Transcranial magnetic stimulation (TMS) usually investigates the corticospinal responses of the agonist Muscle to strength training, despite the role of the Antagonist Muscle in strength development. We examined the intracortical responses from an agonist and Antagonist Muscle following a single session of heavy-loaded strength training (dominant-arm only) to identify the early Antagonistic responses to a single session that may accompany improvements in strength. Corticospinal and motor cortical excitability and inhibition was collected from agonist and Antagonist Muscles prior to and following a single session of heavy-loaded wrist flexor training in 18 individuals. Training consisted of four sets 6–8 repetitions at 80% of 1-repetition maximum (1-RM). Recruitment curves for corticospinal excitability and inhibition of the right wrist flexor and wrist extensor Muscles were constructed and assessed by examining the area under the recruitment curve. Intracortical measures were obtained using paired-pulse TMS. Following a single training session, increases in corticospinal excitability were observed in both the agonist and Antagonist Muscles. This was accompanied by decreases in corticospinal inhibition in both Muscles. Intracortical inhibition was reduced and intracortical facilitation was increased for the agonist Muscle only. Intracortical measures in the Antagonist Muscle remained unchanged after training. These findings indicate that the corticospinal responses to a single session of strength training are similar between agonist and Antagonist Muscles, but the intrinsic cortico-cortical circuitry of the Antagonist remains unchanged. The corticospinal responses are likely due to increased involvement/co-activation of the Antagonist Muscle during training as the agonist Muscle fatigues.