title: Physical activity, obesity, and risk of colon and rectal cancer in a cohort of Swedish men.
abstract: We investigated the association between physical activity and colorectal cancer risk in a cohort of Swedish men. Information on physical activity was obtained at baseline in 1997 with a self-administered questionnaire from 45,906 men who were cancer-free at enrollment. During a mean follow-up of 7.1 years, 496 cases of colorectal cancer occurred. Leisure-time physical activity was inversely associated with colorectal cancer risk; the multivariate hazard ratio (HR) for 60 min or more per day of leisure-time physical activity compared with less than 10 min per day was 0.57 (95% CI 0.41-0.79; P for trend=0.001). Results were similar for colon (HR=0.56; 95% CI 0.37-0.83) and rectal cancer (HR=0.59; 95% CI 0.34-1.02). Home/housework activity was inversely associated with colon cancer risk (HR=0.68; 95% CI 0.48-0.96). No association was observed for work/occupational activity. These results support a role of physical activity in reducing the risk of colon and rectal cancer.
authors.affiliation: Division of Nutritional Epidemiology, The National Institute of Environmental Medicine, Karolinska Institutet, P.O. Box 210, SE-17177 Stockholm, Sweden. susanna.larsson@ki.se
authors.forename: Susanna C
authors.initials: SC
authors.lastname: Larsson
authors.forename: Jörgen
authors.initials: J
authors.lastname: Rutegård
authors.forename: Leif
authors.initials: L
authors.lastname: Bergkvist
authors.forename: Alicja
authors.initials: A
authors.lastname: Wolk
mesh_terms: D000368:Aged; D015992:Body Mass Index; D003110:Colonic Neoplasms / Q000453:epidemiology / Q000209:etiology* / Q000517:prevention & control; D004812:Epidemiologic Methods; D015444:Exercise / Q000502:physiology*; D006801:Humans; D008019:Life Style; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000150:complications*; D012004:Rectal Neoplasms / Q000453:epidemiology / Q000209:etiology* / Q000517:prevention & control; D011795:Surveys and Questionnaires; D013548:Sweden / Q000453:epidemiology