Muscular and cardiorespiratory fitness are independently associated with metabolic risk in adolescents: the HELENA study - Artero, E G; Ruiz, J R; Ortega, F B; España-Romero, V; Vicente-Rodríguez, G; Molnar, D; Gottrand, F; González-Gross, M; Breidenassel, C; Moreno, L A; Gutiérrez, A; Group, L A; Group, H S (Pediatr Diabetes, 2011)