Nitro Strength The muscles Rechichi (2012). Thus, published scientific data on the effect of the use of birth control pills on muscle strength and anaerobic performance have shown contradictory results. Finally, a recent study by Linda Ekenros (2013) from the Karolinska Institute compared upper and lower limb muscle strength as well as jumping performance during 1 cycle of birth control pills and 1 cycle without birth control pills using a crossover design. A secondary objective of that study was to compare these parameters within 3 specific phases of a cycle of birth control pills and the corresponding cycle days during a cycle without birth control pills. For such a study, 17 women were recruited (see Table) who were divided into 2 groups. TABLE. Characteristics of the Subjects (n = 17). Divided into 2 Groups with respect to entry into the Study WITH Contraceptive Pills or WITHOUT Contraceptive Pills. Values are averages (SD). All women in the study on birth control pills used a low dose of monophasic pills containing ethinyl estradiol combined with different progestogens. These women were tested for muscle strength and jumping performance on days 2, 3, or 4 of menstruation (the pill-free phase), on days 7 or 8, and on days 14 or 15 in the scheme. of the pills (phases of the active hormones) (see Figure-diagram). The chart shows the expected hormonal impact during a cycle of birth control pills and a cycle without birth control pills. Test performance days are marked by the gray stripe.
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