The study, published in the November 2009 edition of the Journal of Urology, showed prostate cancer was less likely to be diagnosed in men who exercise regularly than those who were sedentary.
Dr. Stephen J. Freedland and a team of colleagues at the Duke University Prostate Center and the VA Medical Center in Durham, North Carolina analyzed data from 190 men who underwent prostate biopsies and found suspected association.
They found that patients who exercised moderately, or those who participate in three to six hours of walking each week, were two thirds less likely to be diagnosed with prostate cancer than their sedentary counterparts.
Of 111 men who had followed a sedentary lifestyle in the study, about 50 percent were diagnosed with the disease compared with 27 percent of those in a grade equivalent of three to six hours of walking a week.
The researchers also found that men who received the amount of exercise equivalent to walking three hours a week were 86 percent less likely to develop an aggressive form of cancer.
Of the men diagnosed with prostate cancer, aggressive cancer was found in 51 percent of those who lived a sedentary lifestyle and only 22 percent in those who were physically active - the equivalent of one to three hours every week running .
The study found an association between exercise and reduced risk of prostate cancer. But the results do not prove that exercise is the cause of the decline in male reproductive cancers, however, the possibility can not be excluded.
Exercise or physical activity has been associated with reduced risk of cancer in general, not just prostate cancer. One possibility is that exercise can follow a healthy lifestyle that includes a healthy diet.
However, exercise alone can potentially have a protective effect against prostate cancer and possibly other cancers.
To say the least, has been known that exercise lowers the levels of sex hormones like testosterone and others that are known to promote prostate cancer growth. Exercise may also boost immunity and fight against the body of the oxidation mechanisms that can help reduce the chances of men acquiring prostate cancer.
A recent study published on Oct 27, 2009 in the online British Journal of Cancer, also suggests that physical activity can help reduce the risk of prostate cancer.
The study, led by N. Orsini, of the Karolinska Institutet in Stockholm, Sweden and colleagues found an inverse association between physical activity like walking or cycling, and reduced risk of prostate cancer.
Orsini and colleagues analyzed data from a cohort of 45,887 men ages 45 to 79 years, researchers tracked between January 1998 and December 2007, the confirmation of the incidence of prostate cancer. They also evaluated patients between 1998 and December 2006, and its subtypes of fatal prostate cancer.
During follow-up, 2735 cases of prostate cancer and 190 prostate cancer cases were fatal.
The researchers tracked the incidence of prostate cancer in the upper quartile of the life of total physical activity was reduced by 16% compared with the lowest quartile. A similar inverse association was also found between the job for half-life or work and walking or biking the length and prostate cancer risk.
Compared with those who were forced to sit for most of their working day, the men who sit only half the time experienced a risk reduction of 20%.
For every 30 minutes a day of increased walking or cycling lifetime in the range of 30 to 120 minutes per day, the risk of total prostate cancer decreased by 7 percent for localized prostate cancer by 8 percent and for advanced prostate cancer by 12 percent.
An estimated 192,280 U.S. men will be diagnosed with prostate cancer in 2009. The disease is expected to kill 27,360 men in the country this year, according to the National Cancer Institute.
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