AUTHOR=Amekran Youssra , Damoun Narjisse , El Hangouche Abdelkader Jalil TITLE=Analysis of frequency-domain heart rate variability using absolute versus normalized values: implications and practical concerns JOURNAL=Frontiers in Physiology VOLUME=15 YEAR=2024 URL=https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2024.1470684 DOI=10.3389/fphys.2024.1470684 ISSN=1664-042X