| Early physical activity provides sustained bone health benefits later in childhood. | |
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MedLine Citation:
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PMID: 19997029 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: This study examined the potential effect of early childhood moderate and vigorous physical activity (MVPA) on later bone health. METHODS: Three hundred and thirty-three children, participating in the Iowa Bone Development Study, were studied at ages 5, 8, and 11 yr. MVPA (min x d(-1)) was measured using an accelerometry-based physical activity monitor. Bone mineral content (BMC; g) of the whole body, lumbar spine, and hip was measured using dual-energy x-ray absorptiometry. Mixed regression models were used to test whether MVPA at age 5 yr had an effect on BMC at ages 8 and 11 yr after adjustment for concurrent height, weight, age, maturity, and MVPA. The analysis was repeated to control for bone outcomes at age 5 yr. Mixed-model least-squares mean values at the person level of covariates for age group were used to compare the BMC at ages 8 and 11 yr of children in the highest and lowest quartiles of MVPA at age 5 yr. RESULTS: For boys and girls, MVPA at age 5 yr predicted BMC adjusted for concurrent height, weight, age, maturity, and MVPA at ages 8 and 11 yr (P < 0.05). When the analysis was repeated to also control for BMC at age 5 yr, the effect of MVPA at age 5 yr was significant for boys but not for girls. Boys and girls in the highest quartile of MVPA at age 5 yr had 4%-14% more BMC at ages 8 and 11 yr than those in the lowest quartile of MVPA at age 5 yr (P < 0.05). CONCLUSIONS: These results provide support for the benefits of early MVPA on sustained bone health during childhood especially for boys. Results indicate the importance of increasing MVPA as a strategy to improve BMC later in childhood. |
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Authors:
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Kathleen F Janz; Elena M Letuchy; Julie M Eichenberger Gilmore; Trudy L Burns; James C Torner; Marcia C Willing; Steven M Levy |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural |
Journal Detail:
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Title: Medicine and science in sports and exercise Volume: 42 ISSN: 1530-0315 ISO Abbreviation: Med Sci Sports Exerc Publication Date: 2010 Jun |
Date Detail:
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Created Date: 2010-05-20 Completed Date: 2010-09-10 Revised Date: 2011-07-28 |
Medline Journal Info:
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Nlm Unique ID: 8005433 Medline TA: Med Sci Sports Exerc Country: United States |
Other Details:
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Languages: eng Pagination: 1072-8 Citation Subset: IM; S |
Affiliation:
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Department of Health and Sport Studies, The University of Iowa, Iowa City, IA 52242, USA. kathleen-janz@uiowa.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Bone Density
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physiology* Child Child Development / physiology Child, Preschool Exercise / physiology* Female Humans Male Monitoring, Ambulatory Prospective Studies Sex Factors |
| Grant Support | |
ID/Acronym/Agency:
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M01-RR00059/RR/NCRR NIH HHS; R01 DE012101-02/DE/NIDCR NIH HHS; R01 DE012101-03/DE/NIDCR NIH HHS; R01 DE012101-04/DE/NIDCR NIH HHS; R01 DE012101-05/DE/NIDCR NIH HHS; R01 DE012101-05S1/DE/NIDCR NIH HHS; R01 DE012101-06/DE/NIDCR NIH HHS; R01 DE012101-07/DE/NIDCR NIH HHS; R01 DE012101-08/DE/NIDCR NIH HHS; R01 DE012101-09/DE/NIDCR NIH HHS; R01 DE012101-10/DE/NIDCR NIH HHS; R01 DE012101-11A2/DE/NIDCR NIH HHS; R01-DE09551/DE/NIDCR NIH HHS; R01-DE12101/DE/NIDCR NIH HHS |
| Comments/Corrections | |
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