title: The effect of office-based physician's advice on adolescent exercise behavior.
abstract: BACKGROUND
  This study examines whether the adolescents' current levels of physical activity are increased by their physicians' advice provided in the office, in accordance with the American Medical Association recommendation.
  
  
  METHODS
  The first adolescent (12-21 years old) of whichever age and gender, passing through six family physicians' offices during a 6-month period was assigned to the intervention group, and the second adolescent of the same age and gender was assigned to the control group. Each patient was classified as active, partially active, and inactive, according to how they answered the questions about their physical activity levels, and patients in the intervention group were then provided with reinforcement, increase, or initiation counseling, respectively. Identical procedures were repeated at the 6- and 12-month office visits. Changes in prevalence of activity, as well as, duration, frequency, and intensity of exercise and/or sports were verified at each visit.
  
  
  RESULTS
  Of the 87.5% of the original sample that completed the survey, 6- and 12-month data were available for 70.1%. Among the 392 adolescents that finished the study, those provided with counseling had 41.5% more active adolescents, as well as 26.8%, 38.0% and 26.2% higher duration, frequency and intensity, respectively, than the control group.
  
  
  CONCLUSIONS
  The proportion of active adolescents, as well as, the duration, frequency and intensity of leisure time exercise and/or sports are increased by physician advice.
authors.affiliation: Centro de Salud Santa Bárbara, Calle Esparteros 6, 45006 Toledo, Spain. rortegas@meditex.es
authors.forename: Ricardo
authors.initials: R
authors.lastname: Ortega-Sanchez
authors.forename: Carmelo
authors.initials: C
authors.lastname: Jimenez-Mena
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Cordoba-Garcia
authors.forename: Joaquin
authors.initials: J
authors.lastname: Muñoz-Lopez
authors.forename: Maria Luisa
authors.initials: ML
authors.lastname: Garcia-Machado
authors.forename: Jordi
authors.initials: J
authors.lastname: Vilaseca-Canals
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior; D000328:Adult; D016022:Case-Control Studies; D002648:Child; D003376:Counseling; D015444:Exercise; D005194:Family Practice; D005260:Female; D006293:Health Promotion / Q000379:methods*; D006801:Humans; D008297:Male; D013030:Spain; D011795:Surveys and Questionnaires