{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T01:34:46Z","timestamp":1760146486727,"version":"build-2065373602"},"reference-count":36,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2024,11,10]],"date-time":"2024-11-10T00:00:00Z","timestamp":1731196800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100002322","name":"Coordena\u00e7\u00e3o de Aperfei\u00e7oamento de Pessoal de N\u00edvel Superior\u2014Brasil (CAPES)","doi-asserted-by":"publisher","award":["001"],"award-info":[{"award-number":["001"]}],"id":[{"id":"10.13039\/501100002322","id-type":"DOI","asserted-by":"publisher"}]},{"name":"CNPq","award":["001"],"award-info":[{"award-number":["001"]}]},{"name":"Araucaria Foundation\u2014PR\/SESA-PR\/CNPq\/MS-Decit","award":["001"],"award-info":[{"award-number":["001"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJERPH"],"abstract":"<jats:p>This study aimed to observe adolescents\u2019 changes and individual responses regarding the anthropometry, cardiometabolic profile, vitamin D concentrations, physical fitness, and motor competence upon immediate return and three months of school activities after lockdown. Methods: The study included 28 adolescents (14.8 \u00b1 0.8 years) of both sexes. Anthropometric measures, body composition, cardiometabolic parameters, physical fitness, and motor competence were assessed. A paired t-test was used to compare the frequencies of respondents and the effect size of the results, considering significant p &lt; 0.05. Results: After three months of school activities, adolescents changed their body composition, reducing % fat mass (p = 0.008) and increasing fat-free mass (p = 0.008). In terms of physical fitness, there was increased abdominal resistance (p &lt; 0.001; ES = \u22120.42) and motor performance, with reduction in supine-to-stand test time (p &lt; 0.001; ES = 0.53). There were very beneficial effects in reducing resting heart rate (p \u2264 0.001; ES = 0.61) and increasing vitamin D concentrations (p &lt; 0.001; ES = \u22120.61). After three months of a school routine, the proportions of change in respondents were similar between girls and boys and eutrophic individuals and overweight individuals. Conclusions: Returning to school activities after lockdown was important for the recovery of vitamin D concentrations, physical fitness, and motor competence, whose responses were independent of the level of adiposity and sex of the adolescents.<\/jats:p>","DOI":"10.3390\/ijerph21111494","type":"journal-article","created":{"date-parts":[[2024,11,11]],"date-time":"2024-11-11T03:52:07Z","timestamp":1731297127000},"page":"1494","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Importance of Return to Usual and School Activities After Social Isolation in Recovering Vitamin D Concentrations, Physical Fitness, and Motor Performance in Adolescents"],"prefix":"10.3390","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9001-6123","authenticated-orcid":false,"suffix":"Jr.","given":"Frederico Bento de","family":"Moraes","sequence":"first","affiliation":[{"name":"Department of Physical Education, Federal University of Paran\u00e1, Curitiba 81531-980, PR, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6953-0793","authenticated-orcid":false,"given":"Maiara Cristina","family":"Tadiotto","sequence":"additional","affiliation":[{"name":"Department of Physical Education, Federal University of Paran\u00e1, Curitiba 81531-980, PR, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5423-2179","authenticated-orcid":false,"given":"Brenda","family":"Lenardt","sequence":"additional","affiliation":[{"name":"Densitometry Research Laboratory, Postgraduate Program in Physical Education and Health, Technological Federal University of Paran\u00e1, Curitiba 81531-980, PR, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7571-9181","authenticated-orcid":false,"given":"Jorge","family":"Mota","sequence":"additional","affiliation":[{"name":"Center for Research in Physical Activity, Health and Leisure (CIAFEL)\u2014Faculty of Sports, University of Porto (FADEUP), 4200-450 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5422-9623","authenticated-orcid":false,"given":"Oslei de","family":"Matos","sequence":"additional","affiliation":[{"name":"Densitometry Research Laboratory, Postgraduate Program in Physical Education and Health, Technological Federal University of Paran\u00e1, Curitiba 81531-980, PR, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4752-6697","authenticated-orcid":false,"given":"Neiva","family":"Leite","sequence":"additional","affiliation":[{"name":"Department of Physical Education, Federal University of Paran\u00e1, Curitiba 81531-980, PR, Brazil"}]}],"member":"1968","published-online":{"date-parts":[[2024,11,10]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1214","DOI":"10.1161\/CIRCULATIONAHA.106.177052","article-title":"Promoting physical activity in children and youth: A leadership role for schools: A scientific statement from the American Heart Association Council on Nutrition, Physical Activity, and Metabolism (Physical Activity Committee) in collaboration with the Councils on Cardiovascular Disease in the Young and Cardiovascular Nursing","volume":"114","author":"Pate","year":"2006","journal-title":"Circulation"},{"key":"ref_2","unstructured":"WHO (2021). 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