article 2020 14 pages Reciprocal Associations Between Sleep, Mental Strain, and Training Load in Junior Endurance Athletes and the Role of Poor Subjective Sleep Quality Maria Hrozanova, Christian A. Klöckner, Øyvind Sandbakk, Ståle Pallesen, Frode Moen JournalFrontiers in PsychologyDOI10.3389/fpsyg.2020.545581Publication typeOriginal ResearchStudy typeobservationalPopulationjunior endurance athletes View on DOI ↗