Fatoni, Fatoni, and Mohammad Dika Raswadi. “Relationship of Resting Heart Rate Variability to Physical Fitness Levels in Adolescents”. Biomedical Journal of Indonesia 12, no. 2 (May 19, 2026): 145–150. Accessed August 4, 2026. https://bji-fk.ejournal.unsri.ac.id/index.php/bji/article/view/327.