A cross-sectional association of physical fitness with positive and negative affect in children and adolescents: the up & down study

1. del Río-de Cózar, P.
2. Carbonell-Baeza, A.
3. Padilla-Moledo, C.
4. Veiga, O.L.
5. Esteban-Gonzalo, L.
6. Mota, J.
7. Castro-Piñero, J.