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Related Concept Videos

The Menstrual Cycle01:19

The Menstrual Cycle

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The menstrual cycle is a recurrent sequence of changes in the uterine endometrium, specifically its functional layer, the stratum functionalis. This cycle prepares the uterus for potential pregnancy. This cycle typically spans 21–35 days, averaging 28 days, and aligns with the ovarian cycle, regulated by fluctuating levels of ovarian hormones, primarily estrogen and progesterone.
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Hormonal Regulation of the Menstrual Cycle01:22

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The ovarian cycle regulates endometrial changes throughout a single menstrual cycle via the coordinated action of gonadotrophin-releasing hormone (GnRH) and gonadotrophins.
At puberty, GnRH begins a pulsatile release pattern, which triggers the anterior pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). The frequency and amplitude of GnRH pulses vary across the menstrual cycle, with faster pulses favoring LH release and slower pulses favoring FSH...
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Menses Phase01:18

Menses Phase

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The uterine cycle begins with the menstrual phase, which is considered day one of the cycle and typically lasts about five days. This phase is characterized by the degeneration and shedding of the stratum functionalis, the functional layer of the endometrium.
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Ovarian Cycle01:27

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The menstrual cycle includes a critical component known as the ovarian cycle, which undergoes two main phases each month—the follicular phase and the luteal phase. The follicular phase is variable and averaging around 14 days. Ovulation, triggered by a surge in luteinizing hormone (LH), marks the transition between the two phases. The second phase, the luteal phase, is relatively consistent, lasting approximately 14 days, and is marked by the activity of the corpus luteum. While a cycle...
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Secretory Phase01:19

Secretory Phase

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The secretory phase of the menstrual cycle, spanning from day 14 to 28 in a typical 28-day cycle, is a period of significant physiological changes in the female reproductive system. This phase commences immediately after ovulation and is characterized by the preparation of the endometrium for potential embryo implantation.
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Hormonal Control of the Ovarian Cycle01:30

Hormonal Control of the Ovarian Cycle

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The ovarian cycle is meticulously regulated by the hypothalamic-pituitary-gonadal axis. This cycle orchestrates the release of a mature oocyte, essential for reproduction.
Before puberty, the hypothalamus releases GnRH in a low frequency, low amplitude pulsatile manner. This along with the immature hypothalamic-pituitary-gonadal axis activity, results in low estrogen levels and the absence of a fully functional ovarian cycle.  At puberty, GnRH secretion increases in both frequency and...
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Related Experiment Video

Updated: Dec 3, 2025

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How to study the menstrual cycle: Practical tools and recommendations.

Katja M Schmalenberger1, Hafsah A Tauseef2, Jordan C Barone2

  • 1Institute of Medical Psychology, Center for Psychosocial Medicine, Heidelberg University Hospital, Heidelberg University, Heidelberg, Germany.

Psychoneuroendocrinology
|October 28, 2020
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Summary

Standardized methods are crucial for studying the menstrual cycle. This paper provides guidelines and tools to improve consistency in menstrual cycle research, enhancing data reliability and replicability.

Keywords:
EstrogenMenstrual cycleMethodsProgesteroneRecommendationsReview

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Area of Science:

  • Reproductive Endocrinology
  • Psychophysiology
  • Behavioral Science

Background:

  • Inconsistent methodologies in menstrual cycle research hinder knowledge accumulation.
  • Lack of standardized operationalization leads to confusion and limits systematic reviews.
  • Previous studies often fail to account for menstrual cycle variability.

Purpose of the Study:

  • To provide integrative guidelines and standardized tools for studying the menstrual cycle.
  • To improve the consistency and replicability of research on menstrual cycle effects.
  • To facilitate the accurate assessment of menstrual cycle influences on physiological and psychological outcomes.

Main Methods:

  • Review of existing literature on menstrual cycle research methodologies.
  • Development of recommendations for study design, sampling, and data collection.
  • Proposal of standardized tools for measuring menstrual bleeding, hormones, and ovulation.
  • Guidelines for data preparation, coding, visualization, and statistical analysis.

Main Results:

  • A comprehensive framework for operationalizing the menstrual cycle in research is presented.
  • Specific recommendations are provided for data collection, including hormone assays and ovulation tracking.
  • Standardized approaches for data analysis and interpretation are suggested to ensure consistency.

Conclusions:

  • Adoption of these guidelines will enhance the meaningfulness and replicability of study results.
  • Standardized methods are essential for advancing our understanding of menstrual cycle influences.
  • These tools will benefit research where the menstrual cycle is a primary focus or a confounding variable.