title: Activity level and risk of overweight in male health professionals.
abstract: OBJECTIVE
  This study undertook to examine relationships between nonsedentary activity level, time spent watching television (TV)/videocassette recorder (VCR), and risk of overweight among men.
  
  
  METHODS
  Men participating in the Health Professionals Follow-Up Study were mailed surveys. Cross-sectional analyses examined the prevalence and odds of being overweight, prospective analyses determined cumulative incidence rates and relative risks of becoming overweight over 2 years of follow-up.
  
  
  RESULTS
  Cross-sectionally, odds of being overweight were 50% (95% confidence interval [CI] = 45%; 55%) lower for men in the highest quintile of nonsedentary activity level when compared with men in the lowest quintile. Among men watching 41 or more hours of TV/VCR per week, the odds of being overweight were 406 (95% CI = 2.67, 6.17) times greater than those for men watching no more than 1 hour per week. Prospectively, higher levels is of nonsedentary activity and lower levels of TV/VCR viewing were independently associated with lower relative risks for becoming overweight between survey years.
  
  
  CONCLUSIONS
  Both a lack of nonsedentary activity and time spent watching TV/VCR contribute to the development of overweight in men. Sedentary and nonsedentary activities represent separate domains, each with independent risks for overweight.
authors.affiliation: Department of Health and Social Behavior, Harvard School of Public Health, Boston, Mass., USA.
authors.forename: P L
authors.initials: PL
authors.lastname: Ching
authors.forename: W C
authors.initials: WC
authors.lastname: Willett
authors.forename: E B
authors.initials: EB
authors.lastname: Rimm
authors.forename: G A
authors.initials: GA
authors.lastname: Colditz
authors.forename: S L
authors.initials: SL
authors.lastname: Gortmaker
authors.forename: M J
authors.initials: MJ
authors.lastname: Stampfer
mesh_terms: D000328:Adult; D000368:Aged; D003430:Cross-Sectional Studies; D005500:Follow-Up Studies; D006282:Health Personnel / Q000706:statistics & numerical data; D006801:Humans; D015994:Incidence; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D009043:Motor Activity; D009765:Obesity / Q000453:epidemiology*; D016017:Odds Ratio; D015995:Prevalence; D011446:Prospective Studies; D012307:Risk Factors; D011795:Surveys and Questionnaires; D014481:United States / Q000453:epidemiology