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Senior editor Janet Raloff blogs from the 2009 meeting gathering dozens of societies together in New Orleans


Birth control pills can limit muscle-training gains
Mildly 'androgenic' hormones in some birth-control pills appear to sabotage strength-building exercise.

Some female athletes may pay a price for using oral contraception: lower strength gains from resistance exercise. These muscle-building exercises depend on lifting weights (like barbells and those in the big machines at your local gym) or working against tension bands and bars (like those in Bowflex devices).
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