FRANCUZIAK, Anna Ewelina, DEMBICKI, Piotr Mikołaj, KOZŁOWSKA, Kinga, KALINOWSKA, Weronika, KULASZA, Paulina Sara, KACZMAREK , Aleksandra, KACZMAREK , Wojciech, BAGIŃSKI, Konrad, JABŁONOWSKA, Magdalena and KRAKOWIAK, Magdalena. Differences between Relative Energy Deficiency in Sport (RED-S) and Overtraining Syndrome in Endurance Athletes: A Systematic Review of Clinical, Endocrine and Performance-Based Indicators. Quality in Sport. Online. 19 November 2025. Vol. 46, p. 66554. [Accessed 11 December 2025]. DOI 10.12775/QS.2025.46.66554.