Original ArticlesGains in hip bone mass from high-impact training are maintained: A randomized controlled trial in children☆,☆☆
Section snippets
Participants and study design
From the original cohort of 89 children, 74 returned for follow-up testing, including 37 jumpers (21 boys, 16 girls) and 37 controls (23 boys, 14 girls). Fifteen did not return for follow-up testing because of time constraints (n = 8), parental concern for additional radiographic exposure (n = 2), disinterest in testing (n = 2), or because they moved (n = 3). No children in the current study were excluded based on the exclusion criteria previously reported.7 Racial categories include 73 white
Subject characteristics
Jumpers and controls had similar gains in height, weight, and body fat over 14 months (Table I).Empty Cell Jumpers (n = 37) Controls (n = 37) Age (y) Baseline 7.56 ± 0.17 7.60 ± 0.19 Postintervention 8.15 ± 0.18 8.19 ± 0.19 Postdetraining 8.83 ± 0.18 8.87 ± 0.19 Height (cm) Baseline 125.1 ± 1.3 126.3 ± 1.3 Postintervention 128.8 ± 1.3 129.5 ± 1.3 Postdetraining 132.7 ± 1.2 133.8 ± 1.3 Weight (kg) Baseline 26.9 ± 0.8 27.2 ± 1.2 Postintervention
Discussion
We report that, at the hip, significant gains in both femoral neck BMC and BA from a 7-month high-impact loading intervention were retained after an equivalent period of detraining. Specifically, after 7 months of detraining, jumpers maintained 4% greater BMC and 4% greater BA at the femoral neck than controls. By contrast, at the spine, the gain in BMC from the intervention was not retained after an equivalent period of detraining.
This study has several strengths. First, the detraining period
Acknowledgements
We thank all of the parents, children, and Mt View Elementary School, who graciously volunteered to participate in this study.
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Supported by National Institutes of Health grant No. RO1 AR45655-01, Division of National Institute of Arthritis and Musculoskeletal and Skin Diseases.
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Reprint requests: Christine Snow, PhD, Oregon State University, Corvallis, OR 97331-3303.