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Related Concept Videos

The Menstrual Cycle01:19

The Menstrual Cycle

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.
The menstrual phase occurs from days 1 to 5 and involves the shedding of the stratum functionalis, as a uterine...
Menses Phase01:18

Menses Phase

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.
When fertilization does not occur, the corpus luteum deteriorates, causing a significant drop in the levels of estrogen and progesterone in the body. This hormonal decrease triggers the release of prostaglandins, which cause the uterine...
Hormonal Regulation of the Menstrual Cycle01:22

Hormonal Regulation of the Menstrual Cycle

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 release.
Disorders of the Female Reproductive System01:24

Disorders of the Female Reproductive System

The female reproductive system can be affected by several disorders, including Premenstrual Syndrome (PMS), Premenstrual Dysphoric Disorder (PMDD), endometriosis, and various forms of cancer. PMS and PMDD are cyclical conditions that cause physical and emotional distress, with symptoms that include edema, mood swings, and food cravings. PMDD is a more severe form of PMS characterized by increased symptom severity that peaks during the luteal phase and tends to improve or resolve shortly after...
Secretory Phase01:19

Secretory Phase

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.
Following ovulation, the corpus luteum, a temporary endocrine structure, produces progesterone and estrogens. These hormones stimulate the growth and coiling of endometrial...
Pulse rhythm01:30

Pulse rhythm

Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac muscle...

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Rodent Estrous Cycle Monitoring Utilizing Vaginal Lavage: No Such Thing As a Normal Cycle
09:05

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Menstrual bleeding patterns among regularly menstruating women.

Sonya S Dasharathy1, Sunni L Mumford, Anna Z Pollack

  • 1Epidemiology Branch, Division of Epidemiology, Statistics, and PreventionResearch, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Rockville, MD 20852, USA.

American Journal of Epidemiology
|February 22, 2012
PubMed
Summary
This summary is machine-generated.

Detailed menstrual bleeding patterns offer insights into reproductive health. Higher follicle-stimulating hormone and progesterone levels correlate with heavier and longer menstrual periods in premenopausal women.

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Area of Science:

  • Reproductive endocrinology
  • Gynecology
  • Women's health research

Background:

  • Menstrual bleeding patterns are key reproductive health indicators.
  • Limited research exists on regularly menstruating premenopausal women's bleeding patterns.
  • Assessing bleeding patterns can offer noninvasive insights into endocrine status.

Purpose of the Study:

  • To evaluate self-reported menstrual bleeding patterns in premenopausal women.
  • To investigate the incidence of midcycle spotting.
  • To determine associations between reproductive hormones and bleeding characteristics.

Main Methods:

  • Utilized data from 201 women in the BioCycle Study (2005-2007) over two cycles.
  • Employed daily questionnaires and pictograms for bleeding pattern assessment.
  • Applied marginal structural models, weighted linear mixed-effects models, and survival analysis to link hormone levels with bleeding outcomes.

Main Results:

  • Median bleeding duration was 5 days, with heaviest flow in the first 3 days.
  • Only 4.8% of women reported midcycle bleeding.
  • Elevated follicle-stimulating hormone and progesterone levels were linked to increased menstrual blood loss and duration.
  • Anovulatory cycles were associated with reduced bleeding volume and duration compared to ovulatory cycles.

Conclusions:

  • Detailed menstrual bleeding pattern characterization can serve as a noninvasive marker for endocrine status.
  • Hormonal fluctuations significantly influence menstrual bleeding volume and length.
  • Further research into bleeding patterns can enhance understanding of reproductive health and endocrine function.