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Breast Cancer Health Center

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Exercise Raises Odds of Beating Breast Cancer

Walking Just 3 Hours per Week Halves Breast Cancer Death Risk
By
WebMD Health News

May 24, 2005 -- Just a little exercise dramatically improves a woman's chances of surviving breast cancer.

How little? Walking just one hour a week is enough to make a survival difference. Just a little more exercise -- walking three hours a week at an average pace of 2 to 2.9 miles per hour -- cuts the risk of dying from breast cancer in half.

The findings come from an analysis of long-term data on some 3,000 women with breast cancer. Michelle D. Holmes, MD, DrPH, assistant professor at Harvard Medical School, and colleagues report the study in the May 25 issue of the Journal of the American Medical Association.

"Women who did three to five hours of exercise per week had the most benefit. They were 50% less likely to die," Holmes tells WebMD. "Women with breast cancer have little to lose and much to gain from being physically active."

That's good news for women with breast cancer, says Anne McTiernan, MD, PhD, author of Breast Fitness: An Optimal Exercise and Health Plan for Reducing Your Risk of Breast Cancer. McTiernan is director of cancer prevention at Fred Hutchinson Cancer Research Center. "Women don't have to become athletes. They just have to get up and get moving," McTiernan tells WebMD. "Of course, we advise them to start

slowly. Most women are debilitated after cancer treatment, so they need to take it easy at first as they become active again."

Vigorous Exercise Not Bad -- but Not Necessary

Holmes and colleagues found that compared with women who did not get at least an hour of walking each week:

  • Women with 1 to 3 hours of weekly walking cut their risk of breast cancer death by 20%.
  • Women with 3 to 5 hours of weekly walking cut their risk of breast cancer death by 50%.
  • Women with 5 to 8 hours of weekly walking cut their risk of breast cancer death by 44%.
  • Women with more than 8 hours of weekly walking cut their risk of breast cancer death by 40%.

Holmes notes that there is no reason for women with breast cancer to avoid vigorous physical activity if they enjoy it.

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