A new study by researchers at the Washington University
School of Medicine in St. Louis says that exercise even during teenage years
reduces the risk of breast cancer by 25 percent.
The study involved 65,000 nurses ages 24 to 42 who were
involved in a large health study. All of them answered questionnaires on their
physical activity regimen during teenage years. Six years after enrolling in
the study 550 women developed breast cancer.
The researchers found that women who had good physical
activity regimen during their teen years were 23 percent less likely to develop
breast cancer as compared to women who had low levels of physical activity.
"This really points to the benefit of sustained
physical activity from adolescence through the adult years, to get the maximum
benefit," said lead author Dr. Graham Colditz.
The details of the
study appear in the Journal of the National Cancer Institute.