title: Physical activity, sedentary index, and mental disorders in the SUN cohort study.
abstract: OBJECTIVE
  There is evidence to suggest a beneficial effect of physical activity on several mental disorders.
  
  
  METHODS
  The study aim was to assess the association between low physical activity during leisure time (or sedentary lifestyles) and the incidence of mental disorders in 10,381 participants, from a Spanish dynamic prospective cohort of university graduates followed up for 6 yr (the SUN study). The baseline assessment included a validated questionnaire on physical activity during leisure-time and sedentary activities. A subject was classified as an incident case of mental disorder if he or she reported a physician diagnosis of depression, anxiety or stress, and/or the use of antidepressant medication or tranquilizers in at least one of the follow-up questionnaires.
  
  
  RESULTS
  The odds ratios (OR) and 95% confidence intervals (CI) of a mental disorder for successive levels of leisure-time physical activity were 1 (reference), 1.00 (0.81, 1.23), 0.99 (0.81, 1.21), 0.72 (0.58, 0.89), and 0.81 (0.65, 1.00) (P for trend: < 0.01). The OR for subjects who spent more than 42 h.wk(-1) watching television and/or using the computer was 1.31 (95% CI = 1.01, 1.68) as compared with those spending less than 10.5 h.wk(-1).
  
  
  CONCLUSIONS
  Our findings suggest a joint association of leisure-time physical activity and sedentary behavior on the incidence of mental disorders.
authors.affiliation: Department of Clinical Sciences, University of Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Spain. asanchez@dcc.ulpgc.es
authors.forename: Almudena
authors.initials: A
authors.lastname: Sanchez-Villegas
authors.forename: Ignacio
authors.initials: I
authors.lastname: Ara
authors.forename: Francisco
authors.initials: F
authors.lastname: Guillén-Grima
authors.forename: Maira
authors.initials: M
authors.lastname: Bes-Rastrollo
authors.forename: Jose Javier
authors.initials: JJ
authors.lastname: Varo-Cenarruzabeitia
authors.forename: Miguel A
authors.initials: MA
authors.lastname: Martínez-González
mesh_terms: D000328:Adult; D015992:Body Mass Index; D015331:Cohort Studies; D005260:Female; D006801:Humans; D015994:Incidence; D008019:Life Style; D016015:Logistic Models; D008297:Male; D001523:Mental Disorders / Q000453:epidemiology*; D009043:Motor Activity; D011446:Prospective Studies; D012307:Risk Factors; D013030:Spain / Q000453:epidemiology; D011795:Surveys and Questionnaires