Exercise Helps Prevent Breast Cancer

Exercise Helps Prevent Breast Cancer,[link widoczny dla zalogowanych]
Exercise reduces levels of estrogen,[link widoczny dla zalogowanych], testosterone,[link widoczny dla zalogowanych], insulin,[link widoczny dla zalogowanych], and growth factors,[link widoczny dla zalogowanych], all of which may either cause breast cancer or prompt it to grow faster and larger. Women with high levels of these hormones in their blood have a high risk of developing breast cancer.
Research recently presented at the American Association for Cancer Research annual meeting in San Francisco may shed some additional light. Dr. Celia Byrne and colleagues (from Harvard University) studied the relationship between C-peptide,[link widoczny dla zalogowanych], a marker of insulin production,[link widoczny dla zalogowanych], and risk for breast cancer in the Nurses' Health Study,[link widoczny dla zalogowanych], which involves more than 32,[link widoczny dla zalogowanych],000 women.
They measured C-peptide in blood from the 463 women who developed breast cancer and compared it with blood C-peptide levels in a sample of women who did not develop the disease,[link widoczny dla zalogowanych].
They found that those who had the highest C-peptide levels had a statistically significant,[link widoczny dla zalogowanych], 70 percent greater chance of developing breast cancer compared with women who had the lowest levels.
In the same study,[link widoczny dla zalogowanych], they found that C-peptide levels were higher in overweight and obese women and were lower in women who were physically active. Other studies have shown that insulin levels drop right after an exercise session,[link widoczny dla zalogowanych], so the beneficial effect is immediate.
To reduce the risk of breast cancer,[link widoczny dla zalogowanych], women should engage in aerobic exercise for at least 30 minutes every day,[link widoczny dla zalogowanych], preferably more. Walking is an excellent aerobic activity and can be done easily by most women.
Small things count - walking down the hall to talk with a colleague rather than e-mailing,[link widoczny dla zalogowanych], walking or biking to work,[link widoczny dla zalogowanych], taking physically active vacations with family,[link widoczny dla zalogowanych], using stairs rather than elevators.
Those who are already active can get more benefit by doing more exercise - as long as they don't overdo it,[link widoczny dla zalogowanych]. A good rule of thumb is to increase the time spent exercising no more than 10 percent per week,[link widoczny dla zalogowanych].
Those who embark on an intense training program (such as preparing for a marathon) should make sure they get enough rest including one day of rest from training every week,[link widoczny dla zalogowanych].
Many of the benefits of exercise in breast-cancer prevention may also apply for women who have had breast cancer,[link widoczny dla zalogowanych].
Overweight and obese breast-cancer patients have poorer survival than lighter-weight women,[link widoczny dla zalogowanych]. Exercise can therefore be an important part of the breast-cancer recovery process,[link widoczny dla zalogowanych].
Dr. McTiernan,[link widoczny dla zalogowanych], an internist and epidemiologist,[link widoczny dla zalogowanych], is a member of the Cancer Prevention Research Program at the Fred Hutchinson Cancer Research Center in Seattle,[link widoczny dla zalogowanych], Washington. Martins Press 2001).
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