| Effects of Energy Restriction and Exercise on Bone Mineral Density during Lactation. | |
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MedLine Citation:
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PMID: 22460469 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Modest energy restriction combined with resistance training (RT) has been shown in non-lactating women to protect bone during periods of weight loss. However, there is a paucity of research on dietary interventions and exercise in lactating women aimed at promotion of bone health and weight loss. PURPOSE: To investigate the effects of energy restriction and exercise on bone mineral density (BMD) and hormones during lactation. METHODS: At 4 weeks postpartum, participants were randomized to either a 16-wk intervention (diet restricted by 500 kcal and RT 3 days per week) group (IG=14) or minimal care group (CG=13). Measurements included BMD by DXA, 3 24-hour dietary recalls, and hormones. Repeated measures ANOVA was used to test for group differences over time. RESULTS: Energy intake decreased more in IG (613 ± 521 kcal) than CG (171 ± 435 kcal) (p=0.03). IG lost more weight (5.8 ± 3.5 kg vs CG=1.6 ± 5.4 kg, p=0.02). BMD decreased over time, p<0.01, with no group differences in lumbar spine (IG= 3.4 ± 2.5%, CG= 3.7 ± 3.3%) or hip (IG and CG=3.1 ± 1.8%). Prolactin and estradiol decreased over time in both groups, p<0.01. Basal growth hormone remained stable; however, there was a significant increase in growth hormone response to exercise in IG. CONCLUSIONS: These results suggest that moderate energy restriction combined with RT promote weight loss with no adverse effects on BMD during lactation. |
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Authors:
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Heather L Colleran; Laurie Wideman; Cheryl A Lovelady |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-3-28 |
Journal Detail:
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Title: Medicine and science in sports and exercise Volume: - ISSN: 1530-0315 ISO Abbreviation: - Publication Date: 2012 Mar |
Date Detail:
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Created Date: 2012-3-30 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8005433 Medline TA: Med Sci Sports Exerc Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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1Department of Nutrition, University of North Carolina at Greensboro, Greensboro, NC 27402-6170; 2Department of Kinesiology, University of North Carolina at Greensboro, Greensboro, NC 27402-6170. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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