{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,5]],"date-time":"2026-01-05T15:06:25Z","timestamp":1767625585069,"version":"build-2065373602"},"reference-count":46,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2024,11,25]],"date-time":"2024-11-25T00:00:00Z","timestamp":1732492800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJERPH"],"abstract":"<jats:p>Participation in regular physical activity (PA) is associated with numerous health benefits, including improvement in adolescents\u2019 mental health. The current study aimed to assess the effects of a 12-week physical activity intervention on psychological symptoms of adolescents. The sample of this controlled randomized study was composed by 150 adolescents aged 12 to 15 years old. PA intervention is an adaptation of the ActTeens Program, which includes structured PA sessions delivered during Physical Education classes. The Strengths and Difficulties Questionnaire (SDQ) was used to measure psychological symptoms. To analyze the effects of the intervention on psychological symptoms, generalized estimating equations (GEEs) models were constructed. After 12 weeks, there were no significant intervention effects for emotional problems (mean difference: \u22120.14; 95% IC: \u22121.1\u20130.82), conduct problems (mean difference: 0.14; 95% IC: \u22120.6\u20130.8), attention deficit\/hyperactivity disorder (mean difference: \u22120.66; 95% IC: \u22121.4\u20130.1), peer problems (mean difference: 0.2; 95% IC: \u22120.6\u20131.0), prosocial behavior (mean difference: 0.00; 95% IC: \u22120.8; 0.8) and overall mental health score (mean difference: 0.15; 95% IC: \u22122.0; 2.3). No improvement in psychological symptoms was observed after 12 weeks of PA intervention. Future studies should explore how PA in different dimensions and contexts may impact positively on adolescents\u2019 mental health.<\/jats:p>","DOI":"10.3390\/ijerph21121558","type":"journal-article","created":{"date-parts":[[2024,11,25]],"date-time":"2024-11-25T11:25:33Z","timestamp":1732533933000},"page":"1558","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Effects of a 12-Week Physical Activity Intervention on Psychological Symptoms in Adolescents"],"prefix":"10.3390","volume":"21","author":[{"given":"Maria Carolina Juv\u00eancio","family":"Francisquini","sequence":"first","affiliation":[{"name":"Health Sciences Center, State University of Northern Paran\u00e1, Jacarezinho 86400-000, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1593-4546","authenticated-orcid":false,"given":"G\u00e9ssika Castilho","family":"dos Santos","sequence":"additional","affiliation":[{"name":"Health Sciences Center, State University of Northern Paran\u00e1, Jacarezinho 86400-000, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0737-1886","authenticated-orcid":false,"given":"Thais Maria","family":"de Souza Silva","sequence":"additional","affiliation":[{"name":"Health Sciences Center, State University of Northern Paran\u00e1, Jacarezinho 86400-000, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1706-2377","authenticated-orcid":false,"given":"Pedro Henrique Garcia","family":"Dias","sequence":"additional","affiliation":[{"name":"Health Sciences Center, State University of Northern Paran\u00e1, Jacarezinho 86400-000, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Claudinei Ferreira","family":"dos Santos","sequence":"additional","affiliation":[{"name":"Health Sciences Center, State University of Northern Paran\u00e1, Jacarezinho 86400-000, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7030-9885","authenticated-orcid":false,"given":"Gabriel","family":"Pinzon","sequence":"additional","affiliation":[{"name":"Health Sciences Center, State University of Northern Paran\u00e1, Jacarezinho 86400-000, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7169-8034","authenticated-orcid":false,"given":"Aristides M.","family":"Machado-Rodrigues","sequence":"additional","affiliation":[{"name":"Faculty of Sport Sciences and Physical Education, University of Coimbra, 3040-248 Coimbra, Portugal"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2931-943X","authenticated-orcid":false,"given":"Antonio","family":"Stabelini Neto","sequence":"additional","affiliation":[{"name":"Health Sciences Center, State University of Northern Paran\u00e1, Jacarezinho 86400-000, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2024,11,25]]},"reference":[{"key":"ref_1","unstructured":"de la Salud, O.P. 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