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Menstrual Cycle Essentials

Writer's picture: DR SARA FORSYTHDR SARA FORSYTH

Menstrual Cycle Phases:


  • Basically Divided into Follicular Phase and Luteal Phase.

  • Three hormones involved: FSH, Estrogen (E2), LH, and Progesterone (PG).

  • Ovulation occurs around day 14.


“Regular” Menstrual Cycle:

  1. First period before age 15.

  2. Cycles lasting 21-45 days.

  3. Bleeding lasts 2-7 days.

  4. Irregular cycles can be common in the first 1-2 years.

“Irregular” Menstrual Cycle:

  1. No period by age 15: Primary Amenorrhea

  2. Very heavy, painful, or light periods. Periods that interrupt life.

  3. Cycles shorter than 21 days or longer than 45 days.

  4. Bleeding lasting less than 2 days or more than 7 days.

Menstrual Irregularities:

  • Primary Amenorrhea: No period by age 15.

  • Secondary Amenorrhea: Absence of 3+ cycles after regular periods.

  • Oligomenorrhea: Fewer than 9 cycles/year or cycles longer than 35 days.


Training and Menstrual Cycle:

  • No universal guidelines for adjusting training based on the menstrual phase.

  • Tracking cycles and symptoms can help with personalized adjustments.

  • Tracking helps with keeping track of your cycle over time


Take Aways:

  • Consult a physician if menstrual symptom affect daily life or training.

  • A regular cycle often reflective adequate fueling and good overall health.

  • Hormonal contraception of any kind (pill, patch, ring, implant, shot, IUS) masks menstrual abnormalities.  If using any hormonal medication, the menstrual cycle cannot be used as a gauge of energy availability.



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DR SARA FORSYTH
MSc, MD, CCFP(SEM), DipSportMed(CASEM)

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