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Exercise produces hormone changes that may cut breast cancer risk

Exercise is a healthy, noninvasive, inexpensive and achievable lifestyle factor that can be used to reduce cancer risk. Unlike some other options, e.g., chemoprevention, there are no harmful side effects and the benefits are considerable for many other chronic diseases as well.

A year-long aerobic exercise program for sedentary postmenopausal women produced hormone changes that may reduce the risk of breast cancer. In this randomized trial, Dr. Friedenreich and her colleagues examined the effect of an aerobic exercise intervention on circulating estradiol, estrone, sex hormone-binding globulin, androstenedione, and testosterone levels in 320 women, ages 50 to 74.

The exercise program involved at least 45 minutes of aerobic exercise 5 days a week. In the control group, women merely maintained their usual level of activity.

Women in the intervention group exercised for a mean of 3.6 sessions per week for an average of 178.4 minutes/week. At 12 months, the exercisers had significant reductions in estradiol and free estradiol compared to controls, and significant increases in sex hormone-binding globulin.

There were no significant differences between the groups in estrone, androstenedione, and testosterone levels at 12 months.

This is the first one ever published that has found a statistically significant effect of exercise on estrogen levels, hence, we now have evidence that exercise may influence breast cancer risk through estrogens, which was previously only hypothesized to be one of the pathways.

She and her colleagues are now examining what level of exercise is required to influence these biologic mechanisms, so that more precise exercise guidelines can be developed for breast cancer prevention. 

Source :  reported online February 16th in the Journal of Oncology

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