PMID: 9440370Jan 24, 1998Paper

Calcium potentiates the effect of estrogen and calcitonin on bone mass: review and analysis

The American Journal of Clinical Nutrition
J W NievesR Lindsay

Abstract

We reviewed published clinical trials that measured bone mass of postmenopausal women from at least one skeletal site to evaluate whether calcium supplementation influenced the efficacy of estrogens and intranasal calcitonin on bone mass change. We compared results of the administration of oral estrogen or nasal calcitonin in conjuction with additional calcium intake either through diet or supplements compared with those of estrogen or calcitonin alone. Of the 31 published estrogen trials analyzed, 20 modified the diet or used a calcium supplement (total 1183 mg/d) and 11 did not (total 563 mg/d). The mean increase in bone mass of the lumbar spine when estrogen was given alone was 1.3%/y (n = 5) compared with 3.3%/y when estrogen was given in conjunction with calcium (n = 14; P = 0.01). The mean increase in bone mass of the femoral neck with estrogen alone (n = 3) was only 0.9%/y compared with 2.4%/y when calcium was given with estrogen (n = 6; P = 0.04). Similarly, forearm bone mass increased 0.4%/y with estrogen alone (n = 7) compared with 2.1%/y when estrogen was given with calcium (n = 12; P = 0.04). Similar results were found when weighted means were calculated. Of the seven published trials evaluating the effects of 200 I...Continue Reading

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