article 2026 13 pages Validity of V̇O2max estimates from the forerunner 245 smartwatch in highly vs. moderately trained endurance athletes Florian A. Engel, Lukas Masur, Billy Sperlich, Peter Dücking JournalEuropean Journal of Applied PhysiologyDOI10.1007/s00421-025-05923-xPublication typeOriginal ResearchPopulationendurance athletes View on DOI ↗