The association between past and current physical activity and depressive symptoms in young adults: a 10-year prospective study
Section snippets
Methods
The Nicotine Dependence in Teens study is an ongoing prospective cohort study initiated in 1999 that investigates the natural course of early cigarette use and nicotine dependence in novice smokers. Details of the study design are presented elsewhere [37]. Briefly, 1293 students (52% girls) initially aged 12–13 years from all grade 7 classes in 10 secondary schools in Montreal, Quebec, were enrolled in the study. Schools were selected to represent a range of socioeconomic status (low, medium,
Results
A total of 860 participants provided data on physical activity from survey cycles 1 to 21 and on depressive symptoms at survey cycle 21. Of these, 44 self-reported a clinically diagnosed mood disorder by a physician currently and/or at some point during the course of the study. These participants were excluded from all analyses because the association between physical activity and depressive symptoms is attenuated for individuals with past experiences of MDD [24]. Although participants retained
Discussion
The unique associations of past and current physical activity with depression have received little empirical attention in young adults. Using data from a large population-based cohort study, the current results extend the literature on the cross-sectional and longitudinal associations between physical activity and depression by showing that current physical activity participation (i.e., both MVPA and involvement in team sports) and past involvement in team sports, but not past MVPA, were
Acknowledgments
This work was supported by the Canadian Cancer Society. J.B. was supported by postdoctoral fellowships provided by the Heart and Stroke Foundation of Canada and Psychosocial Oncology Research Training program while this study was conducted. C.M.S., T.A.B., and N.C.P.L. are Fonds de la Recherche en Santé du Québec new investigators. J.L.O. holds a Canada Research Chair in the Early Determinants of Adult Chronic Disease. The funding agencies did not participate in the study design, data
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