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  • Title: Adaptations in corticospinal excitability and inhibition are not spatially confined to the agonist muscle following strength training.
    Author: Mason J, Frazer A, Horvath DM, Pearce AJ, Avela J, Howatson G, Kidgell D.
    Journal: Eur J Appl Physiol; 2017 Jul; 117(7):1359-1371. PubMed ID: 28455814.
    Abstract:
    PURPOSE: We used transcranial magnetic stimulation (TMS) to determine the corticospinal responses from an agonist and synergist muscle following strength training of the right elbow flexors. METHODS: Motor-evoked potentials were recorded from the biceps brachii and flexor carpi radialis during a submaximal contraction from 20 individuals (10 women, 10 men, aged 18-35 years; training group; n = 10 and control group; n = 10) before and after 3 weeks of strength training at 80% of 1-repetition maximum (1-RM). To characterise the input-output properties of the corticospinal tract, stimulus-response curves for corticospinal excitability and inhibition of the right biceps brachii and flexor carpi radialis were constructed and assessed by examining the area under the recruitment curve (AURC). RESULTS: Strength training resulted in a 29% (P < 0.001) increase in 1-RM biceps brachii strength and this was accompanied by a 19% increase in isometric strength of the wrist flexors (P = 0.001). TMS revealed an increase in corticospinal excitability AURC and a decrease in silent period duration AURC for the biceps brachii and flexor carpi radialis following strength training (all P < 0.05). However, the changes in corticospinal function were not associated with increased muscle strength. CONCLUSION: These findings show that the corticospinal responses to strength training of a proximal upper limb muscle are not spatially restricted, but rather, results in a change in connectivity, among an agonist and a synergistic muscle relevant to force production.
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