Exercise can reduce the risk of breast cancer
According to a recent study, changes in the estrogen metabolism are not likely.
Regular physical activity is known to lower the risk of postmenopausal breast cancer . One way this effect works is to reduce endogenous estrogen production as a result of physical activity. But changes in the estrogen metabolism are also theoretically the reason for the context in question. Scientists followed this up in a study and now published their findings in the journal Cancer Epidemiology, Biomarkers & Prevention.
The researchers determined in 306 postmenopausal women, the estrogen levels, and they also measured various substances that arise in the estrogen metabolism as degradation products. Half of the participants regularly performed moderate to intensive training for twelve months (on average just under three hours a week), the other half served as a control group. The cardiovascular fitness was also checked regularly.
The exercising women showed better cardiovascular fitness after 12 months. Also, their body’s estrogen levels were lower than those of the controls. However, there was no effect on degradation products in the estrogen metabolism. According to the study authors, there was no suggestion in this study that a 12-month moderate to intensive physical training would alter estrogen metabolism in such a way that it could lead to a reduced risk of breast cancer. The post-menopausal effect of preventing breast cancer was apparently not due to changes in estrogen metabolism, but rather had other causes.