RT Journal Article T1 Levels of Physical Activity during School Hours in Children and Adolescents: A Systematic Review A1 Grao-Cruces, Alberto A1 Velázquez-Romero, María J. A1 Rodríguez-Rodríguez, Fernando K1 Primary education K1 Secondary education K1 School schedule K1 Recommendations K1 Students K1 Educación primaria y secundaria K1 Citas y programación K1 Estudiantes K1 Directrices para la planificación en salud K1 Búsqueda sistemática AB Background: This systematic review determines the levels of physical activity (PA) during school hours in children and adolescents. Methods: Studies carried out from January 1987 to December 2019 were retrieved from four databases (Web of Science, Pubmed, Scopus and SportDiscus). Results: Twenty-nine studies were included in this systematic review. Most of them used accelerometers and showed that male and female children accumulated a mean of between 14 and 68 min of moderate-to-vigorous PA (MVPA) during school hours (3–22% of this daily segment), and male and female adolescents of accumulated a mean of between 13 and 28 min of MVPA during this daily segment (3–8% of the school hours). Less than a quarter of children and adolescents reached the recommended 30 min of MVPA during school hours, with notable differences between sexes. Conclusions: These results suggest that the levels of PA during school hours are not enough, and consequently, schools should develop strategies for helping children and adolescents reach the school PA recommendation. PB MDPI SN 1661-7827 YR 2020 FD 2020-07-02 LK http://hdl.handle.net/10668/3858 UL http://hdl.handle.net/10668/3858 LA en NO Grao-Cruces A, Velásquez-Romero MJ, Rodriguez-Rodríguez F. Levels of Physical Activity during School Hours in Children and Adolescents: A Systematic Review. Int J Environ Res Public Health. 2020 Jul 2;17(13):4773 DS RISalud RD Apr 11, 2025