title: Strength training effects on urinary steroid profile across the menstrual cycle in healthy women.
abstract: Some studies suggest that performing strength training may cause alterations on the hypothalamic pituitary axis, resulting in steroid hormone variations. Intense training has been associated to slow the concentrations of estrogens and progesterone in women. The main purpose of this study was to evaluate the effects of strength training on the urinary steroid concentrations across the menstrual cycle phases. Twenty healthy women, regularly menstruating and not using pharmacologic contraceptives, performed a strength training during 8 weeks. Participants worked out 3 sets × 10 repetitions, with 2 min recovery time between sets, at 70-75 % of one maximum strength repetition. Urine samples were taken in three different phases of the menstrual cycle (menstrual, follicular and luteal) and they were collected both before and after training. Testosterone, DHEA, cortisol, cortisone, estradiol and progesterone concentrations were determined by gas chromatography-mass spectrometry. The results showed a significant decline after training in the urinary excretion of estradiol, during the menstrual and follicular phase, and progesterone, during the menstrual and luteal phase. No significant difference was observed for other steroid hormones. These data demonstrated that strength training can play an important role in the estrogen and progesterone metabolism in women, decreasing their levels across the menstrual cycle.
authors.affiliation: Department of Physical Education and Sport, University of Extremadura, Av de La Universidad s/n, 10003 Caceres, Spain. rtimon@unex.es
authors.forename: Rafael
authors.initials: R
authors.lastname: Timon
authors.forename: Manuela
authors.initials: M
authors.lastname: Corvillo
authors.forename: Javier
authors.initials: J
authors.lastname: Brazo
authors.forename: Maria Concepción
authors.initials: MC
authors.lastname: Robles
authors.forename: Marcos
authors.initials: M
authors.lastname: Maynar
mesh_terms: D015444:Exercise; D005260:Female; D012739:Gonadal Steroid Hormones / Q000652:urine*; D006801:Humans; D008597:Menstrual Cycle / Q000652:urine*; D055815:Young Adult
chemical_list: D012739:Gonadal Steroid Hormones