Recommended levels and intensities of physical activity to avoid low-cardiorespiratory fitness in European adolescents: The HELENA study

1. Martinez-Gomez, D.
2. Ruiz, J.R.
3. Ortega, F.B.
4. Casajús, J.A.
5. Veiga, O.L.
6. Widhalm, K.
7. Manios, Y.
8. Béghin, L.
9. González-Gross, M.
10. Kafatos, A.
11. España-Romero, V.
12. Molnar, D.
13. Moreno, L.A.
14. Marcos, A.
15. Castillo, M.J.
16. Sjöström, M.