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This version published online on June 28, 2005
Journal of Clinical Endocrinology & Metabolism, doi:10.1210/jc.2005-0195
A more recent version of this article appeared on September 1, 2005
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Submitted on January 28, 2005
Accepted on June 20, 2005

MATERNAL AND SEASONAL PREDICTORS OF CHANGE IN CALCANEAL QUANTITATIVE ULTRASOUND DURING PREGNANCY

M K Javaid, S R Crozier, N C Harvey, P Taylor, H M Inskip, K M Godfrey, C Cooper*, and the SWS Study Group

MRC Epidemiology Resource Centre, University of Southampton, Southampton General Hospital, Southampton SO16 6YD, UK; Department of Medical Physics and Bioengineering, Southampton University Hospitals NHS Trust, Southampton General Hospital, Southampton SO16 6YD, UK

* To whom correspondence should be addressed. E-mail: cc{at}mrc.soton.ac.uk.

Background: During pregnancy, mineralization of the fetal skeleton and obligate urinary losses require adaptation of maternal calcium homeostasis, such as increased intestinal calcium absorption and bone resorption. However, the environmental determinants of maternal bone resorption during pregnancy in healthy adult mothers have not been previously described.

Subjects and methods: We conducted a population-based longitudinal study of 307 term pregnancies using a cohort of 307 pregnant women living in Southampton, UK. During early and late pregnancy, skeletal status was measured at the left calcaneus using quantitative ultrasound (QUS).

Results: There was a significant (P < 0.001) decline in both speed of sound and bone ultrasound attenuation during pregnancy. Those women who were pregnant for the first time (P = 0.001), had low milk intake pre-pregnancy (P = 0.01), and reduced measures of fat mass (P = 0.01), showed the greatest decline in calcaneal bone measurements. Furthermore, those women who were pregnant over winter months had greater losses in calcaneal QUS (P = 0.02).

Conclusion: Maternal lifestyle, fat stores and seasonality of early pregnancy influence maternal calcaneal QUS loss during pregnancy; the findings support a role for vitamin D supplementation of women pregnant during winter, especially those with low calcium intakes who are pregnant for the first time.
Key words: osteoporosis • pregnancy • epidemiology • growth • bone mineral density




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