%0 Journal Article
%T The association between weekly hours of physical activity and mental health: A three-year follow-up study of 15每16-year-old students in the city of Oslo, Norway
%A Aase Sagatun
%A Anne Sˋgaard
%A Espen Bjertness
%A Randi Selmer
%A Sonja Heyerdahl
%J BMC Public Health
%D 2007
%I BioMed Central
%R 10.1186/1471-2458-7-155
%X Longitudinal self-reported health survey. The baseline study consisted of participants from the youth section of the Oslo Health Study, carried out in schools in 2000每2001 (n = 3811). The follow-up in 2003每2004 was conducted partly at school and partly through mail. A total of 2489 (1112 boys and 1377 girls) participated in the follow-up. Mental health was measured by the Strengths and Difficulties Questionnaire with an impact supplement. Physical activity was measured by a question on weekly hours of physical activity outside of school, defined as exertion 'to an extent that made you sweat and/or out of breath'. Adjustments were made for well-documented confounders and mental health at baseline.In boys, the number of hours spent on physical activity per week at age 15每16 was negatively associated with emotional symptoms [B (95%CI) = -0.09 (-0.15, -0.03)] and peer problems [B (95%CI) = -0.08 (-0.14, -0.03)] at age 18每19 after adjustments. In girls, there were no significant differences in SDQ subscales at age 18每19 according to weekly hours of physical activity at age 15每16 after adjustments. Boys and girls with five to seven hours of physical activity per week at age 15每16 had the lowest mean scores for total difficulties and the lowest percentage with high impact score at age 18每19, but the differences were not statistically significant after adjustments.Weekly hours of physical activity at age 15每16 years was weakly associated with mental health at three-year follow-up in boys. Results encourage a search for further knowledge about physical activity as a possible protective factor in relation to mental health problems in adolescence.Mental health problems are a worldwide public health burden. They decrease the quality of life and substantially increase health care costs. At any given time, one in eight children have an impairing psychiatric disorder [1], and considerably more adolescents report psychiatric symptoms [2]. The fact that symptoms of mental distress a
%U http://www.biomedcentral.com/1471-2458/7/155