EVOLUTION OF PHYSICAL FITNESS IN A 4 YEAR-PERIOD IN NON-INSTITUTIONALIZED ELDERLY: MADRID- EXERNET LONGITUDINAL STUDY - Lopez-Torres, O.; Pedrero-Chamizo, R.; Palacios, G.; Maroto, B.; Canada, D.; Melendez, A.; Gonzalez-Gross, M.; (Annals Of Nutrition And Metabolism, 2013)