A one-year exercise intervention program in pre-pubertal girls does not influence hip structure

Research output: Contribution to journalArticle

Abstract

Background: We have previously reported that a one-year school-based exercise intervention program influences the accrual of bone mineral in pre-pubertal girls. This report aims to evaluate if also hip structure is affected, as geometry independent of bone mineral influences fracture risk. Methods: Fifty-three girls aged 7-9 years were included in a curriculum-based exercise intervention program comprising 40 minutes of general physical activity per school day (200 minutes/week). Fifty healthy age-matched girls who participated in the general Swedish physical education curriculum (60 minutes/week) served as controls. The hip was scanned by dual X-ray absorptiometry (DXA) and the hip structural analysis (HSA) software was applied to evaluate bone mineral content (BMC), areal bone mineral density (aBMD), periosteal and endosteal diameter, cortical thickness, cross-sectional moment of inertia (CSMI), section modulus (Z) and cross-sectional area (CSA) of the femoral neck (FN). Annual changes were compared. Group comparisons were done by independent student's t-test between means and analyses of covariance (ANCOVA). Pearson's correlation test was used to evaluate associations between activity level and annual changes in FN. All children remained at Tanner stage 1 throughout the study. Results: No between-group differences were found during the 12 months study period for changes in the FN variables. The total duration of exercise during the year was not correlated with the changes in the FN traits. Conclusion: Evaluated by the DXA technique and the HSA software, a general one-year school-based exercise program for 7-9-year-old pre-pubertal girls seems not to influence the structure of the hip.

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Subject classification (UKÄ) – MANDATORY

  • Orthopedics
Original languageEnglish
JournalBMC Musculoskeletal Disorders
Volume9
Issue number9
Publication statusPublished - 2008
Publication categoryResearch
Peer-reviewedYes

Bibliographic note

The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Medical Radiology Unit (013241410), Reconstructive Surgery (013240300), Clinical and Molecular Osteoporosis Research Unit (013242930)

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Alwis, G., 2009, Department of Clinical Sciences, Lund University. 127 p.

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