![Seasonal variation in physical activity and sedentary time in different European regions. The HELENA study]()
Seasonal variation in physical activity and sedentary time in different European regions. The HELENA studyGracia-Marco, Luis; Ortega, Francisco B.; Ruiz, Jonatan R.; Williams, Craig A.; HagstrÖmer, Maria; Manios, Yannis; Kafatos, Anthony; Béghin, Laurent; Polito, Angela; De Henauw, Stefaan; Valtueña, Jara; Widhalm, Kurt; Molnar, Denes; Alexy, Ute; Moreno, Luis A.; Sjöström, Michael; Helena Study, Group · Journal of Sports Sciences · 2013