AUTHOR=Takayama Fuminori , Aoyagi Atsushi TITLE=Do heart rates of elite marathon runners exhibit room for drift? Implications for durability JOURNAL=Frontiers in Sports and Active Living VOLUME=Volume 7 - 2025 YEAR=2025 URL=https://www.frontiersin.org/journals/sports-and-active-living/articles/10.3389/fspor.2025.1571498 DOI=10.3389/fspor.2025.1571498 ISSN=2624-9367