Eight months of regular in-school jumping improves indices of bone strength in adolescent boys and girls: the POWER PE study

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Title Eight months of regular in-school jumping improves indices of bone strength in adolescent boys and girls: the POWER PE study
Author Weeks, Benjamin Kurt; Young, Catherine Mary; Beck, Belinda Ruth
Journal Name Journal of Bone and Mineral Research
Editor Eisman JA
Year Published 2008
Place of publication United States
Publisher American Society for Bone and Mineral Research
Abstract Introduction: It has been hypothesized that high intensity skeletal loading during growth is an effective strategy to maximize bone accrual and reduce fracture risk in old age. The POWER PE study was an eight-month, randomized, controlled, school-based exercise intervention designed to apply known principles of effective bone loading to practical opportunities to improve life long musculoskeletal outcomes. Materials and Methods: A total of 99 adolescents (46 boys, 53 girls) with a mean age of 13.8  0.4 years (peri-post pubertal) volunteered to participate. Intervention subjects performed ten minutes of jumping activity in place of regular physical education (PE) warm up. Control subjects performed usual PE warm-up activities. Bone mass (DXA and QUS) was assessed at baseline and follow-up along with anthropometry, maturity, muscle power, and estimates of physical activity and dietary calcium. Geometric properties (such as FN moment of inertia) were calculated from DXA measures. Results: Boys in the intervention group experienced improvements in calcaneal BUA (+5.0%), and fat mass (-10.5%), while controls did not (+1.4%, and –0.8% respectively). Girls in the intervention group improved FN BMC (+13.9%) and LS BMAD (+5.2%), more than controls (+4.9% and +1.5% respectively). Between group comparisons of change revealed intervention effects only for WB BMC (+10.6% vs +6.3%) for boys. Boys in the intervention group gained more lean tissue mass, TR BMC, LS BMC, and WB BMC and lost more fat mass than girls in the intervention group (p < 0.05). Conclusions: Ten minutes of jumping activity twice a week for eight months during adolescence appears to improve bone accrual in a sex-specific manner. Boys increased whole body bone mass and BUA, and reduced fat mass, while girls improved bone mass at the hip and spine.
Peer Reviewed Yes
Published Yes
Publisher URI http://www.jbmronline.org/
Alternative URI http://dx.doi.org/10.1359/jbmr.080226
Copyright Statement Copyright 2008 American Society for Bone and Mineral Research. Please refer to the journal link for access to the definitive, published version. This is the author-manuscript version of the paper. Reproduced in accordance with the copyright policy of the publisher.
Volume 23
Issue Number 7
Edition July
Page from 1002
Page to 1011
ISSN 0884-0431
Date Accessioned 2008-06-27
Language en_AU
Research Centre Menzies Health Institute Qld; Centre for Musculoskeletal Research
Faculty Griffith Health Faculty
Subject PRE2009-Orthopaedics
URI http://hdl.handle.net/10072/20443
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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