Physiology of the menstrual cycle

Area of Science:

• Reproductive endocrinology
• Gynecology
• Biochemistry

Background:

• The menstrual cycle involves complex hormonal fluctuations.
• Understanding these hormonal changes is crucial for reproductive health.
• Bioassay techniques allow for detailed monitoring.

Purpose of the Study:

• To correlate hormonal secretion patterns with genital tissue changes during the menstrual cycle.
• To identify key hormonal and physiological indicators of different menstrual phases.
• To evaluate the clinical utility of various ovulation detection methods.

Main Methods:

• Utilized modern bioassay techniques to measure hormone levels.
• Correlated hormone levels with observed genital tissue changes.
• Monitored hormonal profiles including estrogen, progesterone, luteinizing hormone (LH), and follicle-stimulating hormone (FSH).
• Assessed clinical indicators such as basal body temperature, ferning, spinnbarkeit, and vaginal smears.

Main Results:

• Estrogen levels rise during the follicular phase.
• LH and FSH surges occur at ovulation, coinciding with falling estrogen.
• Progesterone and estrogen characterize the luteal phase.
• Gonadotrophin-releasing hormones precede LH and FSH surges.
• Basal body temperature increase reliably indicates ovulation.

Conclusions:

• Hormonal secretion patterns are closely linked to genital tissue changes across the menstrual cycle.
• Basal body temperature remains a highly reliable clinical indicator of ovulation.
• While other methods like ferning and spinnbarkeit can be helpful, vaginal smears have limited utility except for experienced practitioners.