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05.08.2019 | Original Article | Ausgabe 10/2019

European Journal of Applied Physiology 10/2019

Modulation of intracortical inhibition and excitation in agonist and antagonist muscles following acute strength training

Zeitschrift:
European Journal of Applied Physiology > Ausgabe 10/2019
Autoren:
Joel Mason, Glyn Howatson, Ashlyn K. Frazer, Alan J. Pearce, Shapour Jaberzadeh, Janne Avela, Dawson J. Kidgell
Wichtige Hinweise
Communicated by Toshio Moritani.

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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.

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