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. 2021 Mar 8;12:644781. doi: 10.3389/fphys.2021.644781

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Copyright © 2021 Morrison, Sember, Leskošek, Kovač, Jurak and Starc.

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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Delta change scores between the 2003 and 2013 generations in aerobic fitness and maximum heart rate for (A) all (B) boys, and (C) girls. Scatterplots depict mean change for a given age group (age labeled beside each dot).