Vigorous activity protects against breast cancer
Normal-weight women who carry out lots of vigorous exercise are approximately 30% less likely to develop breast cancer than those who don’t exercise vigorously. A study of more than thirty thousand post- menopausal American women, reported in BioMed Central’s open access journal Breast Cancer Research, has revealed that a sedentary lifestyle can be a risk factor for the disease – even in women who are not overweight.
Vigorous activity was judged to include strenuous sports or exercise (running, fast jogging, competitive tennis, aerobics, bicycling on hills and fast dancing). Interestingly, the authors found that non-vigorous activity, such as light housework (vacu- uming, washing clothes, painting, general gardening) and light sports or exercise (walking, hiking, light jogging, recreational tennis, bowling) was not protective. Furthermore, vigorous activity was only protective in lean women and not those who were overweight or obese. According to Leitzmann, “Possible mechanisms through which physical activity may protect against breast cancer that are independent of body mass include reduced exposure to growth factors, enhanced immune function, and decreased chronic inflammation, variables that are related both to greater physical activity and to lower breast cancer risk.”.
*IHRSA is the International Health, Racquet and Sportsclub Association with a membership of over 6,000 health clubs in the U.S., Canada and 70 other countries. See www.ihrsa.org. For membership inquires contact
membership@ihrsa.org or phone 888-640-9580.
Hypertension rates rising
A comparison of U.S. hyper- tension rates over a decade indicates there has been an 18 percent relative increase. Much of this increase is at- tributable to an upward trend in hypertension rates among women, reports Dr. Jeffrey Cutler and his colleagues at the National Heart, Lung, and Blood Institute in Bethesda, Maryland.
Hypertension is a major
risk factor for cardiovascular disease. Prevention involves lifelong dietary and lifestyle changes to improve body weight and to eliminate other cardiovascular risk factors such as high cholesterol and smoking, Cutler told Reuters Health.
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January/February 2009 Fitness Business Canada 15
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