article 2018 7 pages Seasonal variations in body composition, maximal oxygen uptake, and gas exchange threshold in cross-country skiers Metin Polat, Selcen Korkmaz Eryılmaz, Sami Aydoğan JournalOpen Access Journal of Sports MedicineDOI10.2147/OAJSM.S154630Publication typeOriginal ResearchPopulationcross-country skiers View on DOI ↗