Journal article
Subjective and objective measures of physical activity in relationship to bone mineral content during late childhood: the Iowa Bone Development Study
British journal of sports medicine, Vol.42(8), pp.658-663
08/2008
DOI: 10.1136/bjsm.2008.047779
PMID: 18603581
Abstract
This study compared accelerometry to self-report for the assessment of physical activity (PA) in relation to bone mineral content (BMC). In addition, we compared the ability of these measures to assess PA in boys versus girls. Participants in this cross-sectional study included 449 children (mean age 11 years) from the Iowa Bone Development Study. PA was measured via 3-5 days of accelerometry using the Actigraph and 7 day self-report questionnaire using the Physical Activity Questionnaire for Children (PAQ-C). Hip, spine, and whole body BMC were measured via dual energy x ray absorptiometry (DXA). Partial correlation analysis (controlling for height, weight, and maturity) showed the Actigraph was significantly associated with hip (r = 0.40), spine (r = 0.20), and whole body (r = 0.33) BMC in boys, as was the PAQ-C (r = 0.28 hip, r = 0.19 spine, and r = 0.22 whole body). Among girls, only the Actigraph was significantly associated with hip (r = 0.18) and whole body (r = 0.16) BMC. Both the Actigraph and PAQ-C were significant in hip, spine, and whole body multivariable linear regression models (after controlling for body size and maturity) in boys. Only the Actigraph entered hip BMC regression model in girls. Our study supports previous work showing associations between everyday PA and BMC in older children. These associations are more likely to be detected with an objective versus subjective measure of PA, particularly in girls.
Details
- Title: Subtitle
- Subjective and objective measures of physical activity in relationship to bone mineral content during late childhood: the Iowa Bone Development Study
- Creators
- K F Janz - Department of Health and Sport Studies, University of Iowa, Iowa City, IA 52242, USA. kathleen-janz@uiowa.eduH C Medema-JohnsonE M LetuchyT L BurnsJ M Eichenberger GilmoreJ C TornerM WillingS M Levy
- Resource Type
- Journal article
- Publication Details
- British journal of sports medicine, Vol.42(8), pp.658-663
- DOI
- 10.1136/bjsm.2008.047779
- PMID
- 18603581
- NLM abbreviation
- Br J Sports Med
- ISSN
- 0306-3674
- eISSN
- 1473-0480
- Publisher
- England
- Grant note
- The authors thank the staff of the Iowa Fluoride Study for their organisational efforts, especially our exercise specialists Ms Kelli O’Neil and Ms Stephanie Orstad. We gratefully acknowledge and thank the children and parents of the Iowa Fluoride Study and the Iowa Bone Development Study, because without their contributions, this work would not have been possible.
- Language
- English
- Date published
- 08/2008
- Academic Unit
- Preventive and Community Dentistry; Epidemiology; Surgery; Injury Prevention Research Center; Neurosurgery; Health, Sport, and Human Physiology
- Record Identifier
- 9983917776002771
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