The Washington University researchers worked with colleagues from the American Cancer Society and examined data from the American Cancer Society Prevention Study II (CPS II) to look at whether changes in physical activity influenced either the incidence of colon cancer diagnosis or the risk of death from the disease.
The CPS II study included more than 150,000 men and women. To determine how exercise affected colon cancer, the researchers compared their levels of physical activity between 1982 and 1997, and linked those activity levels both to the number of colon cancer diagnoses between 1998 and 2005, and to the number of colon cancer deaths that occurred between 1998 and 2006. It turned out that those who exercised consistently for at least 10 years had the lowest risk of colon cancer death.
“People who were consistently active over the course of their adulthood had a lower risk of death from colon cancer than those who were sedentary,” says first author Kathleen Y. Wolin, ScD. “People often wonder around the start of a new year whether exercise really will help them stay healthy or whether it’s already too late. It’s never too late to start exercising, but it’s also never too early to start being active. That’s the message we hope people will take away from this study.”
She says the greatest benefits seem to accrue in those who have exercised for the largest percentage of their lives. But it isn’t necessary to run marathons or to work out for many hours every day.
“You get enormous ‘bang for the buck,’” she says. “You go for a 30-minute walk every day, and you’re going to reduce your risk of a number of diseases. And in addition, our research has also shown that you feel better, physically and mentally, so you’re able to function better.”
And physical activity even can be beneficial after a cancer diagnosis already has been made.
“There is evidence that being physically active can reduce the risk of recurrence and death following a cancer diagnosis,” Wolin says. “So even those who haven’t been physically active can begin exercising after their diagnosis and see some real benefits as well.”
For more information about lifestyle changes and individual cancer risk, visit http://yourdiseaserisk.com
Wolin KY, Patel AV, Campbell PT, Jacobs EJ, McCullough ML, Colditz GA, Gapstur SM. Change in physical activity and colon cancer incidence and mortality, Cancer Epidemiology, Biomarkers & Prevention, vol. 19(12), pp. 3000-3004. Dec. 2010
This work was supported by the National Institutes of Health and by the American Cancer Society.
Washington University School of Medicine’s 2,100 employed and volunteer faculty physicians also are the medical staff of Barnes-Jewish and St. Louis Children's hospitals. The School of Medicine is one of the leading medical research, teaching and patient care institutions in the nation, currently ranked fourth in the nation by U.S. News & World Report. Through its affiliations with Barnes-Jewish and St. Louis Children's hospitals, the School of Medicine is linked to BJC HealthCare.
Siteman Cancer Center encompasses the combined cancer-related programs of Washington University and Barnes-Jewish Hospital. It is the only cancer center within 250 miles of St. Louis designated as a Comprehensive Cancer Center by the National Cancer Institute.
It has locations at Washington University Medical Center on South Kingshighway, at Barnes-Jewish West County Hospital, Barnes-Jewish St. Peters Hospital and has plans to open a facility in south St. Louis County in 2012.
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