She also found significant correlations between different strength parameters and estradiol accumulation. It was concluded that training adapted to phases of the menstrual cycle appears to be more effective compared to traditional strength training.previous blog . It has been reported that some birth control pills can contain up to five times as much exogenous estrogens [not produced in the body] and twice as much progestogen as endogenous [that produced in the body]. There are three main types of birth control pills, monophasic, biphasic and triphasic, although biphasic birth control pills are rarely used and therefore will not be considered. Monophasic birth control pills provide the user with a stable fixed dose of estrogen and progestogen for 21 days after 7 days of placebo. Biphasic birth control pills have a stable amount of estrogen with a twice as varied concentration of progestogen, on days 7-10 and 11-14.