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Several factors can impact the increase in physical fitness in children and adolescents, including chronological age, sex and BMI, in addition to training variables such as weekly frequency, session and intervention duration, and types of exercises performed. To know the importance of variables that can impact physical fitness, it is important for health professionals to identify the most efficient way of prescribing physical exercises for children and adolescents. The aim is review and meta-analyses of the effects of supervised and structured physical exercise on the physical fitness trainability of children and adolescents.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Relevant articles were searched in the PubMed, Cochrane Library, Embase and Scopus platform databases and selected based on the following criteria: children and adolescents aged between 7 and 17 years who performed any type of structured physical exercise compared to a control group without exercise and evaluating physical fitness (strength or muscular power, cardiorespiratory fitness (CRF) or speed. The results are reported in accordance with PRISMA 2020.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Eighty studies were included with a total of 5769 participants. Strength exercises (ES: 1.073; 95% CI, 0.612\u20131.533;\n                      <jats:italic>P<\/jats:italic>\n                      \u2009&lt;\u20090.001; I2: 74%), concurrent (ES: 1.054; 95% CI, 0.255\u20131.853;\n                      <jats:italic>P<\/jats:italic>\n                      \u2009&lt;\u20090.010; I2: 72%) and sports (ES: 0.573; 95% CI, 0.015 to 1.132;\n                      <jats:italic>P<\/jats:italic>\n                      \u2009&lt;\u20090.044; I2: 34%) seem to be the most effective in increasing muscular strength. Aerobic activities (ES: 0.400; 95% CI, 0.258\u20130.542;\n                      <jats:italic>P<\/jats:italic>\n                      \u2009&lt;\u20090.001; I\n                      <jats:sup>2<\/jats:sup>\n                      : 74%), sports (ES: 0.271; 95% IC, 0.148\u20130.394;\n                      <jats:italic>P<\/jats:italic>\n                      \u2009&lt;\u20090.001; I\n                      <jats:sup>2<\/jats:sup>\n                      : 15), or HIIT (ES: 0.668; 95% IC, 0.333\u20131.003;\n                      <jats:italic>P<\/jats:italic>\n                      \u2009&lt;\u20090.001; I\n                      <jats:sup>2<\/jats:sup>\n                      : 29%) resulted in increased CRF (ES: 0.514; 95% IC, 0.220\u20131.808;\n                      <jats:italic>P<\/jats:italic>\n                      \u2009&lt;\u20090.001; I\n                      <jats:sup>2<\/jats:sup>\n                      : 66%). The practice of physical exercise increased muscular power (ES: 0.241; 95% CI, 0.053\u20130.429;\n                      <jats:italic>P<\/jats:italic>\n                      \u2009=\u20090.012; I\n                      <jats:sup>2<\/jats:sup>\n                      : 0%). The practice of HIIT impacts MAS gains (ES: 0.048; 95% CI, 0.050\u2009\u2212\u20090.026;\n                      <jats:italic>P<\/jats:italic>\n                      \u2009=\u20090.029; I\n                      <jats:sup>2<\/jats:sup>\n                      : 44%).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Supervised and structured physical exercise can improve muscular strength (15\u201335%), CRF (5.4\u20138.5%), muscular power (5.6\u201311.8%), and MAS (5.4%) trainability in children and adolescents. Sex, BMI of the subjects and type of exercise performed (aerobic activities, exclusive to strength, HIIT or sports) should be considered when prescribing the exercise.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s12887-024-04929-2","type":"journal-article","created":{"date-parts":[[2024,12,5]],"date-time":"2024-12-05T00:09:26Z","timestamp":1733357366000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Effects of different supervised and structured physical exercise on the physical fitness trainability of children and adolescents: a meta-analysis and meta-regression"],"prefix":"10.1186","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6837-7811","authenticated-orcid":false,"given":"Carolina Dertzbocher Feil","family":"Pinho","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4730-6627","authenticated-orcid":false,"given":"Nat\u00e1lia Carvalho","family":"Bagatini-PhD","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2329-928X","authenticated-orcid":false,"given":"Salime Donida Chedid","family":"Lisboa","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3013-1760","authenticated-orcid":false,"given":"J\u00falio Brugnara","family":"Mello","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0241-9633","authenticated-orcid":false,"given":"Giovani dos Santos","family":"Cunha","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,12,5]]},"reference":[{"key":"4929_CR1","doi-asserted-by":"publisher","DOI":"10.1007\/s40279-022-01752-6","author":"JJ Lang","year":"2022","unstructured":"Lang JJ, Zhang K, Agostinis-Sobrinho C, Andersen LB, Basterfield L, Berglind D, et al. 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