Abstract
Summary
Whole-body vibration training (WBV) attracts great interest as osteoporosis prevention strategy. Twenty-six adolescents with and without Down syndrome (DS) (13 DS; 12–18 years) performed 20 weeks of WBV. The results indicate that WBV seems to provoke a lesser response in adolescents with DS than in those without DS.
Introduction
This study aims to observe the differences between adolescents with and without DS in the effects of 20 weeks of WBV training, on bone mineral content (BMC) and density (BMD).
Methods
Twenty-six adolescents (13 DS; 12–18 years) were measured with dual-energy X-ray absorptiometry before and after the intervention (3/week, 10 repetitions (30–60 s) and 1-min rest, frequency 25–30 Hz and peak-to-peak displacement of 2 mm (peak acceleration 2.5–3.6 g)). Both, an intention-to-treat (ITT) analysis designed to assess the effects on bone mass and a per-protocol analysis, designed to compare poor and high compliers, were performed.
Results
The ITT analysis revealed significant increases in all BMC and BMD parameters (dz = 0.66 to 1.64; all p < 0.05) in the non-DS group, whilst DS group improved whole-body, subtotal (whole-body less head), upper limbs (ULIMBS), pelvis, lower limbs (LLIMBS) and spine BMC (dz = 0.75 to 1.76; all p < 0.05) and subtotal, pelvis, LLIMBS and spine BMD (dz = 0.73 to 1.28; all p < 0.05). Significantly greater increases were evident in the absolute and percent changes of the non-DS group over DS group (d = 0.88 to 3.85; all p < 0.05). ULIMBS BMD showed a tendency towards an interaction (f = 0.41 and p = 0.086) with higher increase for non-DS group. When a per-protocol analysis was considered, high-complier adolescents had 8.1 versus 5.3 % of gains in the spine BMC over poor-complier adolescents (d = 0.93; p < 0.05).
Conclusions
Twenty weeks of WBV training may improve BMC and BMD in clinically relevant skeletal sites in both groups. Nevertheless, this type of training seems to provoke a lesser response in adolescents with DS than in those without DS.
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Acknowledgments
We gratefully acknowledge the help of all of the adolescents and their parents who participated in the study for their understanding and dedication to the project. Specials thanks are given to Fundación Down Zaragoza and Special Olympics Aragón for their support. This work was supported by the “Ministerio de Ciencia e Innovación” “Plan Nacional I + D + i 2009–2011 (Project DEP 2009-09183).” This project has been co-financed by “Fondo Europeo de Desarrollo Regional” (MICINN-FEDER). AML received a Grant AP12-2854 from “Ministerio de Educación Cultura y Deportes.”
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Matute-Llorente, A., González-Agüero, A., Gómez-Cabello, A. et al. Effect of whole-body vibration training on bone mass in adolescents with and without Down syndrome: a randomized controlled trial. Osteoporos Int 27, 181–191 (2016). https://doi.org/10.1007/s00198-015-3232-9
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DOI: https://doi.org/10.1007/s00198-015-3232-9