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Effects of Energy Restriction and Exercise on Bone Mineral Density during Lactation.
MedLine Citation:
PMID:  22460469     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
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.
Authors:
Heather L Colleran; Laurie Wideman; Cheryl A Lovelady
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-3-28
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  -     ISSN:  1530-0315     ISO Abbreviation:  -     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-3-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
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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