Changes in supramaximal M-wave amplitude at different regions of biceps brachii following eccentric exercise of the elbo
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ORIGINAL ARTICLE
Changes in supramaximal M‑wave amplitude at different regions of biceps brachii following eccentric exercise of the elbow flexors Hélio V. Cabral1 · Kristen M. Meiburger2,3 · Liliam F. de Oliveira1,4 · Taian M. Vieira3,5 Received: 20 December 2019 / Accepted: 1 October 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Purpose Previous evidence from surface electromyograms (EMGs) suggests that exercise-induced muscle damage (EIMD) may manifest unevenly within the muscle. Here we investigated whether these regional changes were indeed associated with EIMD or if they were attributed to spurious factors often affecting EMGs. Methods Ten healthy male subjects performed 3 × 10 eccentric elbow flexions. Maximal voluntary contraction (MVC), muscle soreness and ultrasound images from biceps brachii distal and proximal regions were measured immediately before (baseline) and during each of the following 4 days after the exercise. Moreover, 64 monopolar surface EMGs were detected while 10 supramaximal pulses were applied to the musculocutaneous nerve. The innervation zone (IZ), the number of electrodes detecting largest M-waves and their centroid longitudinal coordinates were assessed to characterize the spatial distribution of the M-waves amplitude. Results The MVC torque decreased (~ 25%; P
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