AUTHOR=Afonso José , Buzzachera Cosme F. , Fernandes Ricardo J. TITLE=Commentary: Do Thirty-Second Post-activation Potentiation Exercises Improve the 50-m Freestyle Sprint Performance in Adolescent Swimmers? JOURNAL=Frontiers in Physiology VOLUME=10 YEAR=2019 URL=https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2019.00215 DOI=10.3389/fphys.2019.00215 ISSN=1664-042X