ALTERAÇÕES NO PERFIL LIPÍDICO DURANTE DIFERENTES FASES DO CICLO MENSTRUAL EM MULHERES JOVENS E EM PRÉ-MENOPAUSA.

Background: Lipoprotein cholesterol measurements fluctuated across the menstrual cycle, corresponding to rising and declining concentrations of gonadotropins and ovarian steroid hormones levels in young women, whereas premenopausal women and those who inside the menopausal transition characterized by a poor ovarian response to high secretion of gonadotropin leading to low levels of ovarian steroids. Aims: To investigate the lipoprotein cholesterol changes and their interactions with sex steroid hormones during different phases of the menstrual cycle in menstruated young and old (premenopausal) women. Methods: The sample included thirty healthy women (aged 20-45 years) divided into two groups with 15 women /group according to their ages (20-25 years) (40-45 years). Blood samples were collected on the 8th, 16th, and 24th days of the menstrual cycle from both young and old menstruating women to compare the previous parameters between these days for each group and compare these parameters between similar days for the first and second groups. Lipid profile (Total cholesterol (TC), Triglyceride (TG), High density lipoprotein (HDL), Low density lipoprotein (LDL), and Very low density lipoprotein (VLDL) changes be assayed by Bio-Systems Kit components. Statistical analysis was carried out using one-way Analysis of Variance (ANOVA), followed by Duncan's test, and t-tests were used to assess differences between groups. Results: TC and TG levels did not significantly increase on the 8th day of the menstrual cycle, which represents the follicular phase, in comparison with the other days (16th and 24th days). However, LDL level increased significantly (p ≤ 0.05) on the 8th day compared to the other days. On the other hand, HDL and VLDL levels increased on the 16th day of the menstrual cycle, which represents the ovulatory phase. Discussion: TC, TG, and LDL levels increased during the follicular phase and were accompanied by high levels of FSH and estradiol, leading to a favorable lipid profile, whereas FSH and estradiol are considered regulators of cholesterol biosynthesis and a buffering capacity. HDL and VLDL levels rise during ovulation to meet the requirements of ovulation and ensure successful ovulation. Conclusions: Studying and evaluating changes in the lipid profile according to the menstrual cycle phase of the menstrual cycle represents an important issue in knowing the physiological and healthy woman state and preventing cardiovascular disease incidence. [ABSTRACT FROM AUTHOR]