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Menstrual cycle phase affects temperature regulation during endurance exercise.

J M Pivarnik1, C J Marichal, T Spillman

  • 1Department of Health and Human Performance, University of Houston, Texas 77204.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|February 11, 1992
PubMed
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The luteal phase of the menstrual cycle impairs thermoregulation and increases cardiovascular strain during endurance exercise in women. Core body temperature and perceived exertion are higher during the luteal phase compared to the follicular phase.

Area of Science:

  • Exercise Physiology
  • Human Physiology
  • Reproductive Endocrinology

Background:

  • Thermoregulation during exercise is crucial for performance and safety.
  • Menstrual cycle phase is known to influence various physiological responses.
  • Understanding these influences is important for female athletes and active individuals.

Purpose of the Study:

  • To investigate the effect of menstrual cycle phase on thermoregulation during endurance exercise.
  • To assess cardiovascular strain and perceived exertion in different cycle phases.

Main Methods:

  • Nine eumenorrheic women performed 60 minutes of cycling at 65% of peak oxygen uptake.
  • Measurements included core and skin temperatures, heart rate, oxygen uptake, and perceived exertion.

Related Experiment Videos

  • Subjects were tested in both mid-follicular and mid-luteal phases.

    • Main Results:

    • Core body temperature was significantly higher in the luteal phase compared to the follicular phase.
    • Heart rate and ratings of perceived exertion were also significantly elevated in the luteal phase.
    • Oxygen uptake, sweat loss, and skin temperature were not affected by menstrual cycle phase.

    Conclusions:

    • The luteal phase of the menstrual cycle adversely affects thermoregulation, increasing core body temperature.
    • Cardiovascular strain and perceived exertion are heightened during the luteal phase.
    • These findings highlight the importance of considering menstrual cycle phase in exercise prescription and research for women.