AUTHOR=Fukuda Norio , Granzier Henk , Ishiwata Shin'ichi , Morimoto Sachio TITLE=Editorial: Recent Advances on Myocardium Physiology JOURNAL=Frontiers in Physiology VOLUME=12 YEAR=2021 URL=https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2021.697852 DOI=10.3389/fphys.2021.697852 ISSN=1664-042X