Everyday activity predicts bone geometry in children: the Iowa Bone Development Study.
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| Title: | Everyday activity predicts bone geometry in children: the Iowa Bone Development Study. |
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| Authors: | Janz KF (AUTHOR), Burns TL (AUTHOR), Levy SM (AUTHOR), Torner JC (AUTHOR), Willing MC (AUTHOR), Beck TJ (AUTHOR), Gilmore JM (AUTHOR), Marshall TA (AUTHOR) |
| Source: | Medicine & Science in Sports & Exercise. Jul2004, Vol. 36 Issue 7, p1124-1131. 8p. |
| Abstract: | PURPOSE: Bone adapts to changing mechanical loads by altering the structure appropriately. These adaptations should be evident in the bone cross-sectional area (CSA) and section modulus (Z), indices of axial and bending strength, respectively. In this cross-sectional study, we investigated associations between physical activity, CSA, and Z in 467 young children (mean age 5.2 yr). We also examined whether lean tissue mass, which is predominantly muscle, mediates the relationship between physical activity and bone structural measures. METHODS: Physical activity was assessed using accelerometry and questionnaire. Proximal femur measures of the neck, intertrochanteric, and shaft CSA (cm) and Z (cm) were derived from dual-energy x-ray absorptiometry (DXA) scans using the Hip Structure Analysis program. Total body lean mass (kg) was also measured using DXA. RESULTS: Boys were more physically active than girls. Boys also had greater CSA, Z, and lean mass than girls. At each region, time spent in vigorous activity was positively and consistently associated with CSA and Z in boys and girls (r = 0.19 to 0.32). After adjustment for age, body mass, and height, vigorous activity explained, on average, 6.9% of the variability in CSA and Z. With additional adjustment for lean mass, vigorous activity explained 3.7% of the remaining variability in CSA and Z. CONCLUSION: This study demonstrates that everyday amounts of physical activity in healthy, normal children are associated with bone geometry and that differences in lean mass explain some, but not all, of this association. This suggests that, even in young, nonathletic children, bone may adapt to physical activity by structurally remodeling. [ABSTRACT FROM AUTHOR] |
| Copyright of Medicine & Science in Sports & Exercise is the property of Lippincott Williams & Wilkins and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Education Research Complete |
| FullText | Text: Availability: 0 |
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| Header | DbId: ehh DbLabel: Education Research Complete An: 106574028 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Everyday activity predicts bone geometry in children: the Iowa Bone Development Study. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Janz+KF%22">Janz KF</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Burns+TL%22">Burns TL</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Levy+SM%22">Levy SM</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Torner+JC%22">Torner JC</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Willing+MC%22">Willing MC</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Beck+TJ%22">Beck TJ</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gilmore+JM%22">Gilmore JM</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Marshall+TA%22">Marshall TA</searchLink> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Medicine+%26+Science+in+Sports+%26+Exercise%22">Medicine & Science in Sports & Exercise</searchLink>. Jul2004, Vol. 36 Issue 7, p1124-1131. 8p. – Name: Abstract Label: Abstract Group: Ab Data: PURPOSE: Bone adapts to changing mechanical loads by altering the structure appropriately. These adaptations should be evident in the bone cross-sectional area (CSA) and section modulus (Z), indices of axial and bending strength, respectively. In this cross-sectional study, we investigated associations between physical activity, CSA, and Z in 467 young children (mean age 5.2 yr). We also examined whether lean tissue mass, which is predominantly muscle, mediates the relationship between physical activity and bone structural measures. METHODS: Physical activity was assessed using accelerometry and questionnaire. Proximal femur measures of the neck, intertrochanteric, and shaft CSA (cm) and Z (cm) were derived from dual-energy x-ray absorptiometry (DXA) scans using the Hip Structure Analysis program. Total body lean mass (kg) was also measured using DXA. RESULTS: Boys were more physically active than girls. Boys also had greater CSA, Z, and lean mass than girls. At each region, time spent in vigorous activity was positively and consistently associated with CSA and Z in boys and girls (r = 0.19 to 0.32). After adjustment for age, body mass, and height, vigorous activity explained, on average, 6.9% of the variability in CSA and Z. With additional adjustment for lean mass, vigorous activity explained 3.7% of the remaining variability in CSA and Z. CONCLUSION: This study demonstrates that everyday amounts of physical activity in healthy, normal children are associated with bone geometry and that differences in lean mass explain some, but not all, of this association. This suggests that, even in young, nonathletic children, bone may adapt to physical activity by structurally remodeling. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Medicine & Science in Sports & Exercise is the property of Lippincott Williams & Wilkins and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1249/01.mss.0000132275.65378.9d Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 8 StartPage: 1124 Titles: – TitleFull: Everyday activity predicts bone geometry in children: the Iowa Bone Development Study. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Janz KF – PersonEntity: Name: NameFull: Burns TL – PersonEntity: Name: NameFull: Levy SM – PersonEntity: Name: NameFull: Torner JC – PersonEntity: Name: NameFull: Willing MC – PersonEntity: Name: NameFull: Beck TJ – PersonEntity: Name: NameFull: Gilmore JM – PersonEntity: Name: NameFull: Marshall TA IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 07 Text: Jul2004 Type: published Y: 2004 Identifiers: – Type: issn-print Value: 01959131 Numbering: – Type: volume Value: 36 – Type: issue Value: 7 Titles: – TitleFull: Medicine & Science in Sports & Exercise Type: main |
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