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. 2021 May 27;8:681400. doi: 10.3389/fmolb.2021.681400

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Copyright © 2021 Nix, Hemmati, Cobraiville, Servais and Fillet.

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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Graphs representing the “changes of magnitude” obtained during the five steps of the study. Step 1: before physical exercise, step 2: after 400-m warm-up and 800-m running, step 3: after the completion of 1,600-m running, step 4: 30 min after finishing the exercise, and step 5: 60 min after finishing the exercise. Each color represents one participant. Black lines represent the mean ± SD of the change of magnitude factor obtained at each step (n = 20). (A) Asparagine, (B) valine, and (C) methionine: examples of compound for which no change in blood concentration was observed during the study.