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Thermoregulation in pregnancy. Implications for exercise.

R G McMurray1, V L Katz

  • 1Department of Physical Education, University of North Carolina, Chapel Hill.

Sports Medicine (Auckland, N.Z.)
|September 1, 1990
PubMed
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Maternal hyperthermia during pregnancy, especially in the first trimester, may pose risks to fetal development, particularly the central nervous system (CNS). While conclusive human data is limited, physicians advise avoiding excessive heat exposure during pregnancy.

Area of Science:

  • Teratology
  • Maternal-Fetal Medicine
  • Environmental Health

Background:

  • Maternal hyperthermia is a known teratogen, primarily linked to central nervous system (CNS) abnormalities in animal models.
  • The first trimester of pregnancy is the most critical period for heat exposure risks.
  • Human data on hyperthermia from sources like sauna use are inconclusive, but physicians advise caution.

Purpose of the Study:

  • To review the risks of maternal hyperthermia during pregnancy, particularly concerning exercise.
  • To assess the potential for exercise-induced hyperthermia to affect fetal development.
  • To evaluate current recommendations and available data on exercise and heat exposure in pregnant women.

Main Methods:

  • Review of existing scientific literature on maternal hyperthermia and teratogenicity.

Related Experiment Videos

  • Analysis of data from animal studies and limited human observational studies.
  • Examination of research on exercise physiology in pregnant women and heat dissipation.

    • Main Results:

    • Animal studies consistently show the teratogenic effects of heat, especially in early pregnancy.
    • Human data are less conclusive, but the potential risk necessitates caution.
    • Exercise can elevate maternal core temperature; however, studies on exercising pregnant women suggest they may not reach hazardous levels, particularly non-athletic populations or those exercising in water.

    Conclusions:

    • While definitive human evidence is limited, the potential teratogenic risk of maternal hyperthermia warrants continued medical advice to avoid excessive heat exposure during pregnancy.
    • Further research is needed on high-intensity exercise in diverse pregnant populations.
    • Water-based exercise may mitigate risks associated with heat gain during physical activity for pregnant individuals.