{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T06:15:21Z","timestamp":1790144121049,"version":"4.0.1"},"reference-count":76,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T00:00:00Z","timestamp":1790121600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Public Health"],"abstract":"<jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Although school-based physical activity (PA) is associated with improvements in multiple health and learning indicators, significant gaps persist regarding its systematic implementation at the preschool level. This protocol presents the rationale and methodological design of a curriculum-integrated active break program aimed at evaluating its impact in 5- to 6-year-old preschoolers.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      A three-arm, non-randomized cluster-controlled trial employing a sequential explanatory mixed-methods design (QUAN \u2192 qual) will be conducted in 12 urban public schools in the province of Biob\u00edo, Chile, involving 200 kindergarten preschoolers. Primary outcomes\u2014motor competence and health-related physical fitness\u2014and secondary outcomes\u2014learning outcomes and healthy habits (sleep, eating behavior, nutritional status)\u2014will be assessed at baseline and post-intervention. Over 16\u202fweeks, children in the Total Experimental Group (TEG; 4 schools,\n                      <jats:italic>n<\/jats:italic>\n                      \u202f=\u202f67) will complete 10 active breaks per week; the Partial Experimental Group (PEG; 3 schools,\n                      <jats:italic>n<\/jats:italic>\n                      \u202f=\u202f66) will complete 3\u20135 active breaks per week; and the Control Group (CG; 5 schools,\n                      <jats:italic>n<\/jats:italic>\n                      \u202f=\u202f67) will continue regular daily routines.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Discussion<\/jats:title>\n                    <jats:p>To the best of our knowledge, this is the first controlled trial to simultaneously examine the efficacy of a curriculum-integrated active break program on motor competence, physical fitness, learning outcomes, and healthy habits in preschool-aged children. The inclusive design, digital platform support, and mixed-methods approach position this trial as a novel contribution to the evidence base for early childhood PA interventions and educational public policy.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Study protocol registration<\/jats:title>\n                    <jats:p>\n                      Open Science Framework (OSF). Unique identifier: cu6za. Public URL:\n                      <jats:ext-link>https:\/\/osf.io\/cu6za\/overview<\/jats:ext-link>\n                      .\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.3389\/fpubh.2026.1895830","type":"journal-article","created":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T05:52:33Z","timestamp":1790142753000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Effects of school-based active breaks on motor competence, physical fitness, academic outcomes, and health behaviors in Chilean preschoolers: protocol for a three-arm, non-randomized cluster-controlled mixed-methods trial"],"prefix":"10.3389","volume":"14","author":[{"given":"Mar\u00eda Alejandra","family":"Valencia-Pacheco","sequence":"first","affiliation":[{"name":"Escuela de Educaci\u00f3n, Universidad de Concepci\u00f3n","place":["Los \u00c1ngeles, Chile"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Viviana","family":"Vallejos Garc\u00edas","sequence":"additional","affiliation":[{"name":"Facultad de Educaci\u00f3n, Universidad de Concepci\u00f3n","place":["Concepci\u00f3n, Chile"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karen","family":"Kracht-Suazo","sequence":"additional","affiliation":[{"name":"Escuela de Kinesiolog\u00eda, Facultad de Salud, Universidad Santo Tom\u00e1s","place":["Los \u00c1ngeles, Chile"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniela","family":"Gallegos Abello","sequence":"additional","affiliation":[{"name":"Direcci\u00f3n Comunal de Educaci\u00f3n","place":["Los \u00c1ngeles, Chile"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nicole","family":"Lassere Laso","sequence":"additional","affiliation":[{"name":"Escuela de Nutrici\u00f3n y Diet\u00e9tica, Facultad de Salud, Universidad Santo Tom\u00e1s","place":["Los 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