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 A2 Didáctica de la Educación FísicaPlástica y Musical K1 primary education K1 secondary education K1 school schedule K1 recommendations K1 students AB Background: This systematic reviewdetermines the levels of physical activity (PA) during schoolhours in children and adolescents.Methods: Studies carried out fromJanuary 1987 toDecember 2019wereretrieved from four databases (Web of Science, Pubmed, Scopus and SportDiscus). Results: Twenty-ninestudies were included in this systematic review. Most of them used accelerometers and showed that maleand 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), andmale and female adolescents accumulated ameanof between 13 and 28min ofMVPA during this daily segment (3–8% of the school hours). Less than aquarter 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 duringschool hours are not enough, and consequently, schools should develop strategies for helping childrenand adolescents reach the school PA recommendation. PB MDPI SN 1660-4601 YR 2020 FD 2020-07 LK http://hdl.handle.net/10498/23554 UL http://hdl.handle.net/10498/23554 LA eng DS Repositorio Institucional de la Universidad de Cádiz RD 13-nov-2026