Article
J Sports Sci  (2016)

Relationship between school rhythm and physical activity in adolescents: the HELENA study.

Vanhelst J, Béghin L, Duhamel A, De Henauw S, Molnar D, Vicente-Rodriguez G, Manios Y, Widhalm K, Kersting M, Polito A, Ruiz JR, Moreno LA, Gottrand F.