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Oral contraceptives significantly change body composition in female athletes with oligomenorrhea or amenorrhea but have little immediate effect on physical performance, according to a study.
Dr. Anette Rickenlund of Karolinska University Hospital in Stockholm, Sweden, and her colleagues proposed that even small changes in body composition would affect athletic performance and competitive ability. Others have assessed effects of hormonal changes from oral contraceptives (OCs) only in nonathletic women.
The study included 26 endurance athletes--13 with regular menstruation, 8 with amenorrhea, 5 with oligomenorrhea, and 12 sedentary, normally menstruating controls (J. Clin. Endocrinol. Metab. 89[9]:4364-70, 2004).
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Source: HighBeam Research, Athletic performance not affected by OCs.(Gynecology)