Katarzyna Urbańska, Anna Hawryluk, Adam Żuczek, Kinga Dyndał, Marcelina Broda, Olga Żuczek, Izabela Szczap, Kamil Marzec, Aleksandra Mokrzycka and Patrycja Jędrzejewska-Rzezak 2025. HEART RATE VARIABILITY IN ATHLETES: INDICATOR OF TRAINING LOAD, RECOVERY AND CARDIOVASCULAR HEALTH. International Journal of Innovative Technologies in Social Science. 4, 3(47) (Sep. 2025). DOI:https://doi.org/10.31435/ijitss.3(47).2025.3889.