Impact exercise and bone density in premenopausal women with below average bone density for age (original) (raw)
Abstract
Purpose
To study the effects of two home-based impact exercise programs on areal bone mineral density (aBMD) in adult premenopausal women with below average aBMD for age (negative _Z_-scores; 40.8 years; n = 107).
Methods
Two unilateral impact exercise programs were employed, one targeting the total hip and lumbar spine (n = 42 pairs), the other the distal radius (n = 24 pairs) with some individuals performing both. Force plate data were used to establish exercise loading characteristics (peak loads, time to peak), dual-energy X-ray absorptiometry (DXA) provided bone data. Calcium intake, health and extraneous physical activity (PA) were determined by survey. Exercise for both hip and spine consisted of unilateral landings from adjustable steps (maximum height 63.5 cm) while impacts were delivered to the forearm by arresting falls against a wall. An exercise log was used to provide the exercise prescription, record each exercise bout and any injuries. Participants were randomly assigned to exercise or control groups and pair-matched (age, BMI, Z-score, aBMD). Compliance was calculated as the number of sessions completed divided by the total prescribed number (mean ~50 %).
Results
The programs delivered significant gains pre to post at each site compared with significant losses in controls (forearm: 3.9 vs −3.9 %; total hip: 2.0 vs −2.6 %; lumbar spine: 2.8 vs −2.9 % exercise and controls, respectively, all p < 0.001). No exerciser lost bone at the target site regardless of compliance which was strongly correlated with bone gains (R 2 = 0.53–0.68, all p < 0.001).
Conclusions
Impact exercise provides an effective means of improving below average aBMD without supervision in this at risk population.
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Abbreviations
aBMD:
Areal bone mineral density
BMC:
Bone mineral content
BMI:
Body mass index
CFQ:
Calcium frequency questionnaire
DXA:
Dual energy X-ray absorptiometry
GRF:
Ground reaction forces
MANOVA:
Multiple analysis of variance
METs:
Metabolic equivalents
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Acknowledgments
The authors wish to express their appreciation to the all of the participants and to the Shepherd Foundation of Victoria for funding that supported the project.
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Authors and Affiliations
- School of Medical Sciences, RMIT University, Bundoora West Campus, Plenty Road, Bundoora, VIC, 3083, Australia
Kathleen G. Greenway & Peter A. Rich - School of Health Sciences, RMIT University, Bundoora West Campus, Plenty Road, Bundoora, VIC, 3083, Australia
Jeff W. Walkley
Authors
- Kathleen G. Greenway
- Jeff W. Walkley
- Peter A. Rich
Corresponding author
Correspondence toPeter A. Rich.
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Conflicts of interest
Kathleen Greenway, Jeff Walkley and Peter Rich declare that they have no conflicts of interest.
Research involving human participants and/or animals
Ethical approval All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
Informed consent
Informed consent was obtained from all individual participants included in the study.
Additional information
Communicated by Olivier Seynnes.
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Greenway, K.G., Walkley, J.W. & Rich, P.A. Impact exercise and bone density in premenopausal women with below average bone density for age.Eur J Appl Physiol 115, 2457–2469 (2015). https://doi.org/10.1007/s00421-015-3225-6
- Received: 23 March 2015
- Accepted: 17 July 2015
- Published: 01 August 2015
- Issue date: November 2015
- DOI: https://doi.org/10.1007/s00421-015-3225-6