Document Detail


Lactation is associated with greater maternal bone size and bone strength later in life.
MedLine Citation:
PMID:  21927916     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
SUMMARY: The association between lactation and bone size and strength was studied in 145 women 16 to 20 years after their last parturition. Longer cumulative duration of lactation was associated with larger bone size and strength later in life.
INTRODUCTION: Pregnancy and lactation have no permanent negative effect on maternal bone mineral density but may positively affect bone structure in the long term. We hypothesized that long lactation promotes periosteal bone apposition and hence increasing maternal bone strength.
METHODS: Body composition, bone area, bone mineral content, and areal bone mineral density of whole body and left proximal femur were assessed using DXA, and cross-sectional area and volumetric bone mineral density of the left tibia shaft were measured by pQCT in 145 women (mean age 48 years, range 36-60 years) 16 to 20 years after their last parturition. Hip (HSI) and tibia strength indexes (TBSI) were calculated. Medical history and lifestyle factors including breastfeeding patterns and durations were collected via a self-administered questionnaire. Weight change during each pregnancy was collected from personal maternity tracking records.
RESULTS: Sixteen to 20 years after the last parturition, women who had breastfed in total more than 33 months in their life, regardless of the number of children, had greater bone strength estimates of the hip (HSI = 1.92 vs. 1.61) and the tibia (TBSI = 5,507 vs. 4,705) owing to their greater bone size than mothers who had breastfed less than 12 months (p < 0.05 for all). The differences in bone strength estimates were independent of body height and weight, menopause status, use of hormone replacement therapy, and present leisure time physical activity level.
CONCLUSION: Breastfeeding is beneficial to maternal bone strength in the long run.
Authors:
P K Wiklund; L Xu; Q Wang; T Mikkola; A Lyytikäinen; E Völgyi; E Munukka; S M Cheng; M Alen; S Keinänen-Kiukaanniemi; S Cheng
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2011-09-17
Journal Detail:
Title:  Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA     Volume:  23     ISSN:  1433-2965     ISO Abbreviation:  Osteoporos Int     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-06-06     Completed Date:  2012-09-14     Revised Date:  2013-04-29    
Medline Journal Info:
Nlm Unique ID:  9100105     Medline TA:  Osteoporos Int     Country:  England    
Other Details:
Languages:  eng     Pagination:  1939-45     Citation Subset:  IM    
Affiliation:
Department of Health Sciences, University of Jyväskylä, P.O. Box 35 (LL), 40014, Jyväskylä, Finland.
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MeSH Terms
Descriptor/Qualifier:
Absorptiometry, Photon / methods
Adult
Anthropometry / methods
Body Composition
Bone Density / physiology*
Bone and Bones / anatomy & histology*,  physiology
Breast Feeding
Female
Femur / anatomy & histology,  physiology
Humans
Lactation / physiology*
Middle Aged
Retrospective Studies
Tibia / anatomy & histology,  physiology
Time Factors
Comments/Corrections
Comment In:
Osteoporos Int. 2013 Apr;24(4):1521   [PMID:  23052937 ]
Osteoporos Int. 2013 Apr;24(4):1519   [PMID:  23052936 ]

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