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Calcium supplementation and bone mineral accretion in adolescent girls: an 18-mo randomized controlled trial with 2-y follow-up.
Am J Clin Nutr. 2008 Feb; 87(2):455-62.AJ

Abstract

BACKGROUND

A recent meta-analysis raised doubt as to whether calcium supplementation in children benefits spine and hip bone mineral density (BMD).

OBJECTIVE

We used state-of-the-art measures of bone (fan-beam dual-energy X-ray absorptiometry and 4 bone turnover markers) to determine whether girls with low habitual calcium intake benefited from supplementation with a soluble form of calcium (calcium citrate malate dissolved in a fruit drink).

DESIGN

The trial was an 18-mo randomized trial of calcium supplementation (792 mg/d) with follow-up 2 y after supplement withdrawal. Subjects were 96 girls (mean age: 12 y) with low calcium intakes (mean: 636 mg/d). The main outcome measure was change in total-body, lumbar spine, and total hip bone mineral content (BMC) during supplementation and 2 y after supplement withdrawal. Changes in BMD and bone turnover markers were secondary outcome measures.

RESULTS

The mean additional calcium intake in the supplemented group was 555 mg/d. Compared with the control group, the supplemented group showed significantly (P < 0.05) greater gains in BMC (except at the total hip site) over the 18-mo study. BMD change was significantly (P < 0.05) greater for all skeletal sites, and concentrations of bone resorption markers and parathyroid hormone were significantly (P < 0.01) lower in the supplemented group than in the control group after 18 mo. After 42 mo, gains in BMC and BMD and differences in bone resorption were no longer evident.

CONCLUSIONS

Calcium supplementation enhances bone mineral accrual in teenage girls, but the effect is short-lived. The likely mechanism for the effect of the calcium is suppression of bone turnover, which is reversed upon supplement withdrawal.

Authors+Show Affiliations

Academic Unit of Bone Metabolism, School of Medicine and Biomedical Sciences, University of Sheffield, Sheffield, United Kingdom.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Randomized Controlled Trial
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

18258639

Citation

Lambert, Helen L., et al. "Calcium Supplementation and Bone Mineral Accretion in Adolescent Girls: an 18-mo Randomized Controlled Trial With 2-y Follow-up." The American Journal of Clinical Nutrition, vol. 87, no. 2, 2008, pp. 455-62.
Lambert HL, Eastell R, Karnik K, et al. Calcium supplementation and bone mineral accretion in adolescent girls: an 18-mo randomized controlled trial with 2-y follow-up. Am J Clin Nutr. 2008;87(2):455-62.
Lambert, H. L., Eastell, R., Karnik, K., Russell, J. M., & Barker, M. E. (2008). Calcium supplementation and bone mineral accretion in adolescent girls: an 18-mo randomized controlled trial with 2-y follow-up. The American Journal of Clinical Nutrition, 87(2), 455-62.
Lambert HL, et al. Calcium Supplementation and Bone Mineral Accretion in Adolescent Girls: an 18-mo Randomized Controlled Trial With 2-y Follow-up. Am J Clin Nutr. 2008;87(2):455-62. PubMed PMID: 18258639.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Calcium supplementation and bone mineral accretion in adolescent girls: an 18-mo randomized controlled trial with 2-y follow-up. AU - Lambert,Helen L, AU - Eastell,Richard, AU - Karnik,Kavita, AU - Russell,Jean M, AU - Barker,Margo E, PY - 2008/2/9/pubmed PY - 2008/3/26/medline PY - 2008/2/9/entrez SP - 455 EP - 62 JF - The American journal of clinical nutrition JO - Am. J. Clin. Nutr. VL - 87 IS - 2 N2 - BACKGROUND: A recent meta-analysis raised doubt as to whether calcium supplementation in children benefits spine and hip bone mineral density (BMD). OBJECTIVE: We used state-of-the-art measures of bone (fan-beam dual-energy X-ray absorptiometry and 4 bone turnover markers) to determine whether girls with low habitual calcium intake benefited from supplementation with a soluble form of calcium (calcium citrate malate dissolved in a fruit drink). DESIGN: The trial was an 18-mo randomized trial of calcium supplementation (792 mg/d) with follow-up 2 y after supplement withdrawal. Subjects were 96 girls (mean age: 12 y) with low calcium intakes (mean: 636 mg/d). The main outcome measure was change in total-body, lumbar spine, and total hip bone mineral content (BMC) during supplementation and 2 y after supplement withdrawal. Changes in BMD and bone turnover markers were secondary outcome measures. RESULTS: The mean additional calcium intake in the supplemented group was 555 mg/d. Compared with the control group, the supplemented group showed significantly (P < 0.05) greater gains in BMC (except at the total hip site) over the 18-mo study. BMD change was significantly (P < 0.05) greater for all skeletal sites, and concentrations of bone resorption markers and parathyroid hormone were significantly (P < 0.01) lower in the supplemented group than in the control group after 18 mo. After 42 mo, gains in BMC and BMD and differences in bone resorption were no longer evident. CONCLUSIONS: Calcium supplementation enhances bone mineral accrual in teenage girls, but the effect is short-lived. The likely mechanism for the effect of the calcium is suppression of bone turnover, which is reversed upon supplement withdrawal. SN - 0002-9165 UR - https://www.unboundmedicine.com/medline/citation/18258639/Calcium_supplementation_and_bone_mineral_accretion_in_adolescent_girls:_an_18_mo_randomized_controlled_trial_with_2_y_follow_up_ L2 - https://academic.oup.com/ajcn/article-lookup/doi/10.1093/ajcn/87.2.455 DB - PRIME DP - Unbound Medicine ER -