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Bone status during adolescence, pregnancy and lactation
Kate A Ward1, Judith E Adams, M Zulf Mughal
1Clinical Radiology, Imaging Science & Biomedical Engineering, Stopford Building, University of Manchester, Oxford Road, Manchester M13 9PT, UK. kathryn.a.ward@manchester.ac.uk
Current Opinion in Obstetrics & Gynecology
|June 25, 2005
Summary
Pregnancy and lactation do not negatively impact maternal bone strength. Studies show bone mineral density (BMD) recovery post-weaning, though further research on calcium and vitamin D intake is needed.
Area of Science:
- Reproductive biology
- Skeletal physiology
- Maternal-fetal health
Background:
- Fetal skeletal development requires significant maternal calcium (up to 340 mg/day).
- High calcium demands during pregnancy and lactation challenge maternal skeletal integrity.
- Adaptive skeletal mechanisms are crucial for fetal mineralization and maternal bone health.
Purpose of the Study:
- To review adaptive mechanisms of the female skeleton during pregnancy and lactation.
- To assess the impact on maternal bone strength and fetal skeletal mineralization.
- To synthesize current understanding of maternal skeletal responses to reproductive demands.
Main Methods:
- Literature review of studies on bone status during pregnancy and lactation.
- Analysis of bone mineral density (BMD) changes from pre-conception to post-weaning.
- Examination of studies comparing maternal BMD based on breastfeeding status and calcium intake.
Main Results:
- Maternal spinal BMD fully recovers, and hip BMD nears recovery post-weaning.
- Trabecular bone loss is commonly observed, with evidence of endosteal resorption in metacarpals.
- Breastfeeding in teenage mothers is associated with similar hip BMD to nulliparous women; non-breastfeeding is linked to lower hip BMD.
Conclusions:
- Pregnancy and lactation generally do not result in a negative overall effect on the maternal skeleton.
- Breastfeeding may mitigate negative skeletal effects in teenage mothers, warranting further investigation.
- The impact of low calcium or vitamin D status requires more research for clinical guidance.