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. 2020 Jul 24;11:893. doi: 10.3389/fphys.2020.00893

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Copyright © 2020 Akagi, Sato, Hirata, Imaizumi, Tanimoto, Ando, Ema and Hirata.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Root mean square values of surface electromyography signals (RMS-EMGs) of the rectus femoris muscle, the vastus lateralis and medialis muscles, and the biceps femoris muscle during maximal voluntary contractions (MVCs) of the knee extensors before (black) and after (white) the intervention in the training and control groups. The values of the rectus femoris muscle and the vastus lateralis and medialis muscles were normalized to the peak-to-peak compound muscle action potential amplitude (%Mmax), and those of the biceps femoris muscle were normalized to those during knee flexor MVC (%knee flexor MVC). Time × muscle × group, time × group and muscle × group interactions and a main effect of group were not significant. There was a significant time × muscle interaction. * indicates a significant difference between the intervention. Data are presented as mean ± standard deviation.