article 2023 Impact of COVID-19 Infection on Cardiorespiratory Fitness, Sleep, and Psychology of Endurance Athletes—CAESAR Study Daniel Śliż, Szczepan Wiecha, Jakub S. Gąsior, Przemysław Seweryn Kasiak, Katarzyna Ulaszewska, Marcin Lewandowski, Marcin Barylski, Artur Mamcarz JournalJournal of Clinical MedicineDOI10.3390/jcm12083002Publication typeOriginal ResearchPopulationendurance athletes View on DOI ↗