-- Robert Preidt
MONDAY, Aug. 11, 2014 (HealthDay News) -- Older women intent on
keeping breast cancer at bay may want to start and maintain a
regular exercise regimen, a new study shows.
The researchers found that regular physical activity cuts the
odds of breast cancer in postmenopausal women, but that protection
disappears if women stop exercising.
One expert wasn't surprised by the findings.
"As a breast surgeon, one of my roles is to discuss prevention strategies for women," said Dr. Alison Estabrook, chief of the division of breast surgery at Mount Sinai St. Luke's and Mount Sinai Roosevelt hospitals in New York City.
"Exercise is certainly one prevention strategy I discuss for many reasons, and this study emphasizes the importance of physical activity and of its continuation in the postmenopausal years," she said.
In the study, a team led by Agnes Fournier at the Institut
Gustave Roussy in Villejuif, France, tracked more than 59,000
postmenopausal women in France who were followed for an average of
During that time, more than 2,100 of the women were diagnosed
with primary invasive breast cancer.
Women who in the previous four years had done regular exercise
equivalent to at least four hours of walking or cycling per week
were 10 percent less likely to be diagnosed with breast cancer than
those who did less exercise.
The breast cancer-reducing impact of regular exercise was
independent of weight, body fat, waist circumference and exercise
levels from five to nine years earlier, according to the study
published Aug. 11 in the journal
Cancer Epidemiology, Biomarkers & Prevention.
"Physical activity is thought to decrease a woman's risk for breast cancer after menopause. However, it was not clear how rapidly this association is observed after regular physical activity is begun or for how long it lasts after regular exercise stops," Fournier said in a journal news release.
"Our study answers these questions. We found that recreational physical activity, even of modest intensity, seemed to have a rapid impact on breast cancer risk," she said.
However, because the effect quickly diminished after exercise
ceased, "postmenopausal women who exercise should be encouraged to
continue," Fournier added.
The study also "shows that it is not necessary to engage in
vigorous or very frequent activities; even walking 30 minutes per
day is beneficial," Fournier noted.
Dr. Stephanie Bernik is chief of surgical oncology at Lenox Hill
Hospital in New York City. She said that the French study "gives us
more evidence that indeed, exercise is one way post menopausal
women can reduce their risk of invasive breast cancers."
The study couldn't prove cause-and-effect, and "the exact reason
for the decreased risk is not known -- perhaps these women lived a
healthier lifestyle overall," Bernik said.
"Regardless, it seems that adding exercise to one's routine improves health and decreases cancer risk," she concluded.
The U.S. National Cancer Institute has more about
breast cancer prevention.
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