A school-based exercise intervention elicits substantial bone health benefits: A 2-year randomized controlled trial in girls

MacKelvie, Kerry J., Khan, Karim M., Petit, Moira A., Janssen, Patricia A. and McKay, Heather A. (2003) A school-based exercise intervention elicits substantial bone health benefits: A 2-year randomized controlled trial in girls. Pediatrics, 112 6: e447-e452.


Author MacKelvie, Kerry J.
Khan, Karim M.
Petit, Moira A.
Janssen, Patricia A.
McKay, Heather A.
Title A school-based exercise intervention elicits substantial bone health benefits: A 2-year randomized controlled trial in girls
Journal name Pediatrics  (ERA 2012 Listed)    (ERA 2010 Rank A)   Check publisher's open access policy
Publication date 2003-12
Sub-type Article
Volume number 112
Issue number 6
ISSN 0031-4005
1098-4275
Start page e447
End page e452
Total pages 6
Place of publication Illinois, Chicago, U.S.A
Publisher American Academy of Pediatrics
Language eng
Subject 1114 Paediatrics and Reproductive Medicine
Formatted abstract Objective.
Childhood weight-bearing physical activity is recognized as an important determinant of peak bone mass, and physical activity intervention may represent a feasible strategy for primary prevention of osteoporosis. Previous school-based exercise interventions have all been of <10 months in duration. We implemented a high-impact, circuit-based, jumping intervention (10 minutes, 3 times a week) over 2 school years and compared changes in bone mineral content (BMC) over 20 months (2 school years) in 9.9 ± 0.6-year-old intervention girls (N = 32) and controls (10.3 ± 0.4 years, N = 43).

Methods.
We measured BMC for the total body, lumbar spine, proximal femur (and femoral neck and trochanteric subregions), and lean and fat mass by dual-energy radiograph absorptiometry (Hologic QDR 4500), and height, sitting height, leg length, and weight at baseline and 20 months. We assessed Tanner stage, general physical activity, and calcium intake by questionnaire.

Results.
Girls were Tanner breast stage 1 to 3 at baseline. There were no significant differences in baseline or 20-month change in body size or composition, average physical activity, or calcium intake between groups. There were substantially greater gains in lumbar spine (41.7% vs 38.0%) and femoral neck (24.8% vs 20.2%) BMC in intervention than in control girls (P < .05, analysis of covariance; covariates were baseline BMC and height, change in height, physical activity, and final Tanner stage).

Conclusion.
Three brief sessions of high-impact exercise per week implemented over 2 consecutive years within the elementary school curriculum elicited a substantial bone mineral accrual advantage in pubertal girls. 
Keyword girls
bone health
bone mineral content
exercise
intervention
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article
Collections: Excellence in Research Australia (ERA) - Collection
School of Human Movement Studies Publications
 
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Created: Tue, 10 Mar 2009, 10:34:35 EST by Judy Dingwall on behalf of School of Human Movement Studies