“Influence of ACE Gene Polymorphism on Heart Rate Dynamics During Submaximal Exercise Following a 3-Month Fartlek Training Program in Male Adolescents”. Global Journal of Sport and Exercise Science (GJSES) 2, no. 1 (June 2, 2026). Accessed July 15, 2026. https://gjses.org/index.php/gjses/article/view/50.