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Lumbar bone mineral density changes during pregnancy and lactation
A Honda1, T Kurabayashi, T Yahata
1Department of Obstetrics and Gynecology, Niigata University School of Medicine, Niigata City, Japan. akirahon@med.niigata-u.ac.jp
Summary
Pregnancy and postpartum lactation significantly decrease lumbar bone mineral density (BMD). Ovarian dysfunction, indicated by low estradiol and high prolactin, contributes to bone loss during lactation.
Area of Science:
- Reproductive Endocrinology
- Bone Metabolism
- Mineral Density
Background:
- Pregnancy and lactation are associated with significant physiological changes.
- Understanding bone metabolism shifts during these periods is crucial for maternal health.
Purpose of the Study:
- To investigate changes in lumbar trabecular bone metabolism during pregnancy and lactation.
- To correlate these bone changes with alterations in serum hormone levels.
Main Methods:
- Cross-sectional and longitudinal study design.
- Dual-energy X-ray absorptiometry (DXA) used to measure lumbar bone mineral density (BMD) in 571 postpartum women and 341 controls.
- BMD tracked in 111 women at 3 and 6 months postpartum.
Main Results:
- Postpartum women showed significantly lower lumbar BMD compared to controls.
- Lactating women experienced BMD decrements of 4.9% and 5.9% at 3 and 6 months postpartum, respectively.
- Lower serum estradiol and higher serum prolactin and bone alkaline phosphatase levels were observed in lactating women.
Conclusions:
- Pregnancy is linked to a decrease in lumbar BMD.
- Lactation and amenorrhea contribute to bone loss.
- Ovarian dysfunction is a key factor in postpartum bone loss, alongside lactation status.