title: [Change in prevalence of physical and sports activities in a cohort of students].
abstract: BACKGROUND
  Sedentary lifestyle is one of the worldwide problems of Public Health. Given that, physical activity has both direct and indirect effects on the mortality and morbidity on non-communicable chronic diseases. The aim was to determine the change in prevalence of sedentary lifestyle in a cohort of students.
  
  
  METHODS
  The Universidad Nacional Autónoma de México makes an Automated Medical Examination to students. In this evaluation, the sport, physical activity and other risk factors were analyzed in students admitted in 2010 to the Faculty of Medicine that were previously analyzed in 2007.
  
  
  RESULTS
  A total of 593 students were studied. The mean age was 15.1 ± 1.4 years. The prevalence of physical inactivity increased from 38.3 to 39.9 %. When stratified by gender, women were more sedentary (p < 0.05). Sports activities decreased significantly in frequency and time. In the sedentary population, the prevalence of overweight increased in men and the obesity in women. Smoking increased 4.9 % and alcohol consumption in 36.7 % in both sexes.
  
  
  CONCLUSIONS
  The prevalence of physical inactivity was higher compared to other countries. Smoking and alcohol consumption increased so it is necessary to follow up and implement programs of health promotion.
authors.affiliation: Departamento de Salud Pública, Facultad de Medicina, Universidad Nacional Autónoma de México, Distrito Federal, México. liriayk@unam.mx.
authors.forename: Liria T
authors.initials: LT
authors.lastname: Yamamoto-Kimura
authors.forename: María Guadalupe
authors.initials: MG
authors.lastname: Alvear-Galindo
authors.forename: Cristina
authors.initials: C
authors.lastname: Morán-Alvarez
authors.forename: Ángel
authors.initials: Á
authors.lastname: Rodríguez-Pérez
authors.forename: Héctor
authors.initials: H
authors.lastname: Fernández Varela-Mejía
authors.forename: Cuauhtémoc
authors.initials: C
authors.lastname: Solís-Torres
mesh_terms: D000293:Adolescent; D000428:Alcohol Drinking / Q000453:epidemiology; D015331:Cohort Studies; D015444:Exercise; D005260:Female; D006801:Humans; D008297:Male; D008800:Mexico / Q000453:epidemiology; D009765:Obesity / Q000453:epidemiology; D015995:Prevalence; D057185:Sedentary Behavior; D012907:Smoking / Q000453:epidemiology; D013177:Sports / Q000706:statistics & numerical data / Q000639:trends*; D013337:Students, Medical / Q000523:psychology* / Q000706:statistics & numerical data; D055815:Young Adult
keywords: Adolescents; Body mass index; Sedentary lifestyle