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Calcium Intake, Metabolism, and Gestational Blood Pressure

This study has been completed.
Information provided by:
National Heart, Lung, and Blood Institute (NHLBI) Identifier:
First received: May 25, 2000
Last updated: June 23, 2005
Last verified: April 2002

To determine if low dietary calcium intake and disturbances in maternal calcium metabolism were associated with increases in blood pressure in late pregnancy.

Cardiovascular Diseases
Heart Diseases

Study Type: Observational
Study Design: Observational Model: Natural History

Resource links provided by NLM:

Further study details as provided by National Heart, Lung, and Blood Institute (NHLBI):

Study Start Date: September 1987
Estimated Study Completion Date: August 1991
Detailed Description:


The importance of maintaining dietary calcium intake and normal calcium metabolism for optimal regulation of arterial blood pressure has been demonstrated in humans and animals. Recent reports have suggested that low dietary calcium intake and disturbances in maternal calcium metabolism are associated with increases in blood pressure in late gestation. These factors may be associated with an increased risk of developing pregnancy-induced hypertension.

This study was conducted in response to a Request for Applications on Research on Hypertension in Pregnancy jointly released in 1986 by the National Heart, Lung, and Blood Institute and the National Institute of Child Health and Human Development.


Blood pressure, nutrient intake, and markers of calcium metabolism were prospectively assessed in normal, pregnant women. Nutrient intakes, including dietary calcium, were assessed during gestation weeks 24, 28, 32, 36, and the postpartum period using 3-day food records and 24-hour dietary recalls. Concomitantly, serum measures of calcium metabolism were assessed including serum total and ionized calcium, parathyroid hormone, calcitonin, vitamin D concentration, serum magnesium, phosphorus, sodium, and potassium concentrations. During weeks 24 and 32, urinary excretion of sodium, calcium, magnesium, potassium, phosphorus, cAMP, and creatinine were measured. Blood pressures were measured at every prenatal visit and postpartum. Measures of infant growth and blood pressure were assessed at 1, 6, and 12 months of age to determine if maternal dietary calcium intake exerted long-term influences on infant development and blood pressure.


Genders Eligible for Study:   Male
Accepts Healthy Volunteers:   No

No eligibility criteria

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  More Information

No publications provided Identifier: NCT00005206     History of Changes
Other Study ID Numbers: 1085
Study First Received: May 25, 2000
Last Updated: June 23, 2005
Health Authority: United States: Federal Government

Additional relevant MeSH terms:
Cardiovascular Diseases
Heart Diseases processed this record on November 20, 2014