JAKLIK, Dominik, CHOLEWA, Dominika, GUZIK, Natalia, STARZYK, Radosław, ŚMIAŁEK, Sara, FLOREK, Julia, SŁABY, Wiktor, GROELE, Adrian, DĘBSKA, Patrycja and MICZEK, Marcin. Heart Rate Variability (HRV) as a Marker for Overtraining Syndrome Prevention in Endurance Athletes: A Systematic Review. Quality in Sport. Online. 13 March 2026. Vol. 52, p. 69422. [Accessed 22 April 2026]. DOI 10.12775/QS.2026.52.69422.