{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,14]],"date-time":"2026-02-14T02:28:30Z","timestamp":1771036110928,"version":"3.50.1"},"reference-count":34,"publisher":"BMJ","issue":"10","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Open"],"accepted":{"date-parts":[[2014,8,21]]},"published-print":{"date-parts":[[2014,10]]},"abstract":"<jats:sec>\n                    <jats:title>Objective<\/jats:title>\n                    <jats:p>Many young people do not practise enough physical activity (PA) to benefit their health. The three-cohort study aimed to investigate the prevalence of PA and understand the trends between 2002 and 2010, using a representative sample of Portuguese adolescents.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Design, setting and participants<\/jats:title>\n                    <jats:p>The participants were 8483 adolescents (4067 boys, 4416 girls) who participated in the Health Behaviour in School-aged Children Portuguese survey in 2002, 2006 and 2010.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Design, setting and participants<\/jats:title>\n                    <jats:p>A questionnaire was used to collect data of PA. Analyses were run separately for boys and girls.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Boys aged 15\u201317 reported practising 3.5\u00b11.9 times a week in 2002, 3.9\u00b11.9 times a week in 2006 and 3.8\u00b11.9 times a week in 2010, with a significant increase from 2002 to 2006\/2010 (p&lt;0.05). PA practice during the past 7\u2005days decreased from 4.2\u00b12.1 to 3.9+1.9 between 2002 and 2006 (p&lt;0.001) and also decreased from 4.4\u00b12.1 to 3.8\u00b11.9 between 2006 and 2010 (p&lt;0.001). Among girls, PA practices during the past 7\u2005days declined significantly from 3.5\u00b11.9 to 2.7\u00b11.7 between 2002 and 2006 (p&lt;0.001), and from 3.3\u00b11.9 to 2.9\u00b11.7 between 2006 and 2010 (p&lt;0.001).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>The study points to age as a factor related to diminished PA participation. The study also revealed that the prevalence of PA has decreased over the years for the same age groups.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1136\/bmjopen-2014-006012","type":"journal-article","created":{"date-parts":[[2014,10,7]],"date-time":"2014-10-07T00:38:15Z","timestamp":1412642295000},"page":"e006012","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":26,"title":["Adolescents\u2019 physical activity trends over the years: a three-cohort study based on the Health Behaviour in School-aged Children (HBSC) Portuguese survey"],"prefix":"10.1136","volume":"4","author":[{"given":"Adilson","family":"Marques","sequence":"first","affiliation":[{"name":"Projeto Aventura Social, Lisboa, Portugal"},{"name":"Centro Interdisciplinar de Estudo da Performance Humana, Faculdade de Motricidade Humana, Universidade de Lisboa, Lisboa, Portugal"}]},{"given":"Margarida","family":"Gaspar de Matos","sequence":"additional","affiliation":[{"name":"Centro Interdisciplinar de Estudo da Performance Humana, Faculdade de Motricidade Humana, Universidade de Lisboa, Lisboa, Portugal"},{"name":"Centro de Mal\u00e1ria e Outras Doen\u00e7as Tropicais (CMDT), Universidade Nova de Lisboa, Lisboa, Portugal"}]}],"member":"239","published-online":{"date-parts":[[2014,10,6]]},"reference":[{"key":"2025120520321309000_4.10.e006012.1","doi-asserted-by":"publisher","DOI":"10.1186\/1479-5868-7-40"},{"key":"2025120520321309000_4.10.e006012.2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jsams.2011.05.010"},{"key":"2025120520321309000_4.10.e006012.3","doi-asserted-by":"publisher","DOI":"10.1016\/j.ypmed.2009.09.021"},{"key":"2025120520321309000_4.10.e006012.4","doi-asserted-by":"publisher","DOI":"10.1016\/j.amepre.2004.12.003"},{"key":"2025120520321309000_4.10.e006012.5","unstructured":"WHO. 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