Football training intensity and learning concentration: Roles of fatigue and sleep quality. Jurnal SPORTIF : Jurnal Penelitian Pembelajaran, [S. l.], v. 12, n. 2, p. 324–344, 2026. DOI: 10.29407/js_unpgri.v12i2.28375. Disponível em: https://ojs.unpkediri.ac.id/index.php/pjk/article/view/28375. Acesso em: 1 sep. 2026.