RT Journal Article T1 Objectively measured physical activity and academic performance in school-aged youth: The UP&DOWN longitudinal study. A1 Muntaner-Mas, Adria A1 Martinez-Gomez, David A1 Castro-Piñero, Jose A1 Fernandez-Santos, Jorge R A1 Salmon, Jo A1 Veiga, Oscar L A1 Esteban-Cornejo, Irene K1 Academic achievement K1 Adolescents K1 Children K1 Motor activity K1 School performance AB To examine the longitudinal relationships between objectively measured total volume and specific intensities of physical activity (PA) with academic performance in a large sample of youth aged 6-18 years. A longitudinal study of 1046 youth (10.04 ± 3.10 years) from Spain was followed over 2 years. PA (volume and intensity) was measured by accelerometry. Academic performance was assessed through grades reported on the transcript at the end of the academic year (Mathematics, Language, an average of these two core subjects, and grade point average [GPA]). Longitudinal relationships between PA and four indicators of academic performance were examined using covariance and regression analyses, adjusted for a variety of confounders. Youth Quartile 2 for PA volume at baseline obtained better scores than those who participated in Quartiles 1 or 4 volumes of PA in GPA 2 years later (p = 0.006). There were generally no longitudinal associations between specific PA intensities and any of the academic performance indicators (all p > 0.170). However, a change in light PA over 2 years was inversely associated with three academic indicators in youth (βrange , -.103 to - 090; all P  0.170). However, a change in light PA over 2 years was inversely associated with three academic indicators in youth (βrange , -.103 to - 090; all P  PB Wiley YR 2021 FD 2021-08-15 LK http://hdl.handle.net/10668/18394 UL http://hdl.handle.net/10668/18394 LA en NO Muntaner-Mas A, Martínez-Gómez D, Castro-Piñero J, Fernandez-Santos JR, Salmon J, Veiga ÓL, et al. Objectively measured physical activity and academic performance in school-aged youth: The UP&DOWN longitudinal study. Scand J Med Sci Sports. 2021 Dec;31(12):2230-2240 NO The UP&DOWN Study was supported by the DEP 2010-21662-C04-00 grant from the National Plan for Research, Development, and Innovation (R + D + i) MICINN. DM-G is sup ported by a ’Ramon y Cajal’ contract (RYC-2016-20546). IE-C is supported by the Spanish Ministry of Economy and Competitiveness (RTI2018-095284-J-100). AM-M was a recipient of a José Castillejo Fellowship from the Spanish Ministry of Science, Innovation, and Universities (CAS19/00265). JS is supported by a Leadership Level 2 Fellowship, National Health and Medical Research Council Australia (APP 1176885). This research was par tially funded by “Convocatoria extraordinaria de ayudas a la investigación. Preparación, ejecución y transferencia de conocimiento (convocatoria 2020) de l'Institut de Recerca i Innovació Educativa (IRIE)”. DS RISalud RD Apr 11, 2025