© 1992 Oxford University Press
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Effect of Occupational and Recreational Activity on the Risk of Colorectal Cancer among Males: A Case-Control Study
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*Division of Environmental and Occupational Medicine, Department of Community Medicine Box 1057, Mount Sinai School of Medicine
Clinical Epidemiology Unit, University Canton Hospital Geneva, Switzerland
American Health Foundation 320 E 43 St. New York, NY, USA
Epidemiological studies have consistently demonstrated that either occupational or recreational physical activity is pro tective against colon cancer. However, it is unclear whether recreational activity is similarly protective among those who engage in high or low occupational activity. We therefore compared 440 male cases of colorectal cancer with 1164 male hospital patients. Occupational activity was defined according to job title, while recreational activity was assessed by questionnaire for three different periods of life. Occupational activity was protective with respect to colorectal cancer irrespective of whether one engaged in recreational activity at any different period of life. In contrast, recrea tional activity, performed at 20–44 years of age appeared to decrease colon cancer risk by 10–25% irrespective of the in tensity of job activity. The present results suggest that, although we observed a larger effect with occupational activity than with recreational activity, middle-aged men may reduce their risk of colorectal cancer if they exercise when they are not working. These findings need to be confirmed in other populations.
Revised 1 May 1992
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