Ageing, Sex Differences, and REDs Risk in Endurance Runners: An Integrated Cross-Sectional Study Protocol. - Oreská, Ľudmila; Kundeková, Barbora; Varga, Lukáš; Stebelová, Katarína; Okuliarová, Monika; Payer, Juraj; Sedliak, Milan (Sports (2075-4663), 2026)