POLAK, Mateusz, GRANDOS, Jakub, HUSZCZA, Beata, OLEJNIK, Agnieszka, GRONEK, Konrad, KACZMAREK, Julia, GAJEWSKI, Dominik, GŁOWACKA, Zuzanna, KOŚCIOŁEK, Kinga and KOSOWSKI, Mateusz. Beyond the HPG Axis in Relative Energy Deficiency in Sport: Sleep, Psychological Health, and Neuroendocrine Adaptation in Athletes — A Structured Narrative Review. Quality in Sport. Online. 13 June 2026. Vol. 57, p. 72608. [Accessed 14 June 2026]. DOI 10.12775/QS.2026.57.72608.