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Your Birth Control Could be Keeping You Out of Shape

Young women who use oral contraceptives may not get as much out of their weight-lifting routine as women who are not on the pill. A study suggests that oral contraceptive use impairs muscle gains from resistance exercise training in women.

For the study, 73 healthy women between the ages of 18 and 31 participated in whole-body resistance exercises three times a week for 10 weeks. About half of the women used oral contraceptives.

According to the researchers, there were marked differences in lean muscle mass gains between the two groups. Lean muscle increased by just 2.1 percent in oral contraceptive users, compared with 3.5 percent in those who did not use oral contraceptives.

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