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. 2019 Feb 15;10:119. doi: 10.3389/fphys.2019.00119

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Copyright © 2019 Bontemps, Piponnier, Chalchat, Blazevich, Julian, Bocock, Duclos, Martin and Ratel.

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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Time course of voluntary activation level (VA) of the knee extensors (top) and antagonist EMG of the biceps femoris (bottom) (expressed as percentage of the initial value) during the exercise protocol (expressed in percentage of total repetitions) in children (C), adults (A) and endurance athletes (EA). §, §§, and §§§: significantly different from the first MVIC at P < 0.05, P < 0.01, and P < 0.001, respectively; ^∗∗∗: significantly different between C and EA at P < 0.001; # and ###: significantly different between C and A at P < 0.05 and P < 0.001, respectively; £: significantly different between EA and A at P < 0.05.