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Dr. Michelle Holmes and her colleagues from Harvard University presented their study results at the annual meeting of the American Association for Cancer Research in March 2004. Their findings were from the ongoing Nurses Health Study that has followed almost 122,000 female nurses since 1976. Dr. Holmes and her colleagues reviewed the physical activity reports of 2,167 women who were diagnosed with stages I-III breast cancer after the study began.
Most of the women in this study simply walked for exercise. Those who walked for 1 - 3 hours/week, at a leisurely pace of 3 miles/hour (a 20-minute mile), reduced their risk of cancer recurrence by 25% (as compared to sedentary women).
Those women who were physically active for 3 - 8 hours/week reduced their recurrence risk by a whopping 50%! This latter finding is comparable to the benefits of taking tamoxifen for women who are estrogen receptor positive.
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