Data obtained from 90,509 women participating in the E3N cohort study indicates that regular, vigorous exercise may reduce a woman’s chance of getting breast cancer. The study was published in Cancer Epidemiology, Biomarkers and Prevention (2006; 15(1): 57-64). It followed the subjects, aged between 40 and 65 years (at the start of the study), for 12 years. Frequency and intensity of physical activity was assessed. During that time, there were 3,424 cases of breast cancer diagnosed. There was an inverse relationship between the amount of physical activity and the incidence of breast cancer. Women who reported engaging in vigorous recreational activities more than five hours per week had a relative risk of 0.62, as compared with women who reported engaging in no recreational activities.
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