Jakub Rodziewicz, Wiktor Daniszewski, Viktoria Kretschmer, et al. HEART RATE VARIABILITY (HRV) AS A TOOL FOR OPTIMIZING TRAINING LOAD QUALITY AND RECOVERY IN COMBAT SPORTS: A NARRATIVE REVIEW. IJITSS. 2026;3(1(49). doi:10.31435/ijitss.1(49).2026.5076