title: Resistance training and the risk of colon and rectal cancers.
abstract: OBJECTIVE
  Although there is convincing evidence that physical activity reduces colon cancer risk, research in this area has focused on aerobic activity. We conducted a case-control study to investigate whether resistance training was associated with the risk of colon and rectal cancers.
  
  
  METHODS
  Data were collected on various colorectal cancer risk factors, including recreational physical activity performed during three age periods, from 870 cases and 996 controls in Western Australia in 2005-2007. Participants were classified as having never, possibly, or definitely performed resistance training in each age period and over the adult lifetime. The association between resistance training and colon and rectal cancer risk was analyzed using multinomial logistic regression.
  
  
  RESULTS
  Participants who definitely performed resistance training in their lifetime had a non-significant reduced risk of colon cancer compared with those who did no resistance training (adjusted odds ratio (AOR) = 0.70, 95 % confidence interval (CI) = 0.45-1.11). No association was found for rectal cancer risk (AOR = 1.16, 95 % CI = 0.71-1.87). Performing resistance training was associated with a lower risk of colon cancer in each age period, although none of the relationships were statistically significant.
  
  
  CONCLUSIONS
  This study provides some initial evidence, albeit inconclusive, that resistance training may be inversely associated with colon cancer risk.
authors.affiliation: School of Population Health, The University of Western Australia, Crawley, Australia. terry.boyle@uwa.edu.au
authors.forename: Terry
authors.initials: T
authors.lastname: Boyle
authors.forename: Fiona
authors.initials: F
authors.lastname: Bull
authors.forename: Lin
authors.initials: L
authors.lastname: Fritschi
authors.forename: Jane
authors.initials: J
authors.lastname: Heyworth
mesh_terms: D000328:Adult; D000368:Aged; D016022:Case-Control Studies; D003110:Colonic Neoplasms / Q000453:epidemiology* / Q000209:etiology; D015444:Exercise / Q000502:physiology*; D005260:Female; D006801:Humans; D015994:Incidence; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D012004:Rectal Neoplasms / Q000453:epidemiology* / Q000209:etiology; D012042:Registries / Q000706:statistics & numerical data; D018570:Risk Assessment / Q000706:statistics & numerical data; D012307:Risk Factors; D014904:Western Australia / Q000453:epidemiology