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Insulin insensitivity is associated with a decrease in postprandial thermogenesis in normal pregnancy

S Robinson1, J Viira, J Learner

  • 1Unit of Metabolic Medicine, St Mary's Hospital Medical School, Paddington, London, UK.

Diabetic Medicine : a Journal of the British Diabetic Association
|March 1, 1993
PubMed
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Pregnancy reduces insulin sensitivity and postprandial thermogenesis, suggesting a mechanism for energy conservation. These changes in insulin sensitivity are linked to altered energy expenditure during pregnancy.

Area of Science:

  • Human Physiology
  • Metabolic Studies
  • Reproductive Endocrinology

Background:

  • Insulin sensitivity and energy expenditure are critical metabolic parameters.
  • Pregnancy involves significant physiological adaptations to support fetal growth.
  • Understanding metabolic changes during pregnancy is crucial for maternal and fetal health.

Purpose of the Study:

  • To investigate changes in insulin sensitivity and postprandial thermogenesis across pregnancy.
  • To determine if altered insulin sensitivity contributes to energy conservation during pregnancy.

Main Methods:

  • Cross-sectional and longitudinal study design.
  • Measurement of insulin sensitivity via glucose-insulin clamp technique.
  • Assessment of resting energy expenditure and postprandial thermogenesis using indirect calorimetry.

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Main Results:

  • Insulin sensitivity significantly decreased as pregnancy progressed (p < 0.001).
  • Fasting and meal-stimulated insulin levels increased with advancing gestation.
  • Postprandial thermogenesis was significantly lower in the third trimester compared to non-pregnant controls (p < 0.01).

Conclusions:

  • Pregnancy is characterized by progressive insulin resistance.
  • Reduced postprandial thermogenesis in late pregnancy may contribute to energy conservation.
  • These metabolic adaptations likely support fetal development and maternal energy needs.