![]() ![]() The control group simply stretched for the same time periods. Five hours a week of vigorous aerobic exercise may lower estrogen and progesterone exposure by about 20 percent, and moderately intense activity may offer as much benefit as vigorous exercise walking an hour a day or more appears to be associated with significantly lower breast cancer risk.Ĭan exercise halt cognitive decline? Researchers took a group of people with mild cognitive impairment (for example, those starting to forget things or regularly repeating themselves) and had them engage in aerobic exercise for 45 to 60 minutes a day, 4 days a week, for 6 months. Physical activity is also considered a promising preventive measure against breast cancer-not only because it helps with weight control but because exercise tends to lower circulating estrogen levels. ![]() One study found that while elderly, sedentary women have a 50 percent chance of getting an upper-respiratory illness during the fall season, those randomized to begin a half-hour-a-day walking program dropped their risk down to 20 percent. At the other end of the life cycle, regular exercise may also help prevent age-related immune decline. ![]() Studies have found that if we let kids run around for just six minutes, the levels of immune cells circulating in their blood may increase by nearly 50 percent. In addition to helping us enjoy a healthier body weight, exercise may also boost our immune system. ![]()
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