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  • Title: Thermal response to submaximal exercise before, during and after pregnancy: a longitudinal study.
    Author: Lindqvist PG, Marsal K, Merlo J, Pirhonen JP.
    Journal: J Matern Fetal Neonatal Med; 2003 Mar; 13(3):152-6. PubMed ID: 12820836.
    Abstract:
    BACKGROUND: Heat stress in early pregnancy is known to have a teratogenic effect. Exercise produces excess heat and during pregnancy might therefore present a theoretical risk of malformations. Our aim was to assess the thermal response to exercise of healthy pregnant women in a longitudinal study. METHODS: Fourteen women were examined before pregnancy, and followed five times during, and twice after pregnancy, using a submaximal bicycle test with a target heart rate of 85% of the predicted age-adjusted maximum. The main aim was to present reference values. RESULTS: The temperature at submaximal work load declined continuously from preconception to postpartum levels (37.8 degrees C vs. 36.9 degrees C, p = 0.04). The difference between peak and basal core temperature fell from 0.6 degrees C to 0.05 degrees C at 29 and 36 weeks of gestation, reaching preconception levels at 24 weeks after delivery (0.8 degrees C lower). CONCLUSION: During submaximal exercise the temperature response seemed to provide thermal protection for the embryo and the fetus.
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