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|Title: ||High impact exercise increased femoral neck bone mineral density in older men: a randomised unilateral intervention|
|Authors: ||Allison, Sarah J.|
Folland, Jonathan P.
Rennie, Winston J.
Summers, Gregory D.
Brooke-Wavell, Katherine S.F.
|Keywords: ||High impact exercise|
Bone mineral density
|Issue Date: ||2013|
|Publisher: ||© Elsevier|
|Citation: ||ALLISON, S.J. ... et al., 2013. High impact exercise increased femoral neck bone mineral density in older men: a randomised unilateral intervention. Bone, 53(2), pp.321-328.|
|Abstract: ||Introduction: There is little evidence as towhether exercise can increase BMD in oldermenwith no investigation
of high impact exercise. Lifestyle changes and individual variability may confound exercise trials but can be
minimised using a within-subject unilateral design (exercise leg [EL] vs. control leg [CL]) that has high statistical
Purpose: This study investigated the influence of a 12 month high impact unilateral exercise intervention on
femoral neck BMD in older men.
Methods: Fifty, healthy, community-dwelling older men commenced a 12 month high impact unilateral exercise
intervention which increased to 50 multidirectional hops, 7 days a week on one randomly allocated leg. BMD of
both femurswasmeasured using dual energy X-ray absorptiometry (DXA) before and after 12 months of exercise,
by an observer blind to the leg allocation. Repeated measures ANOVAwith post hoc tests was used to detect significant
effects of time, leg and interaction.
Results: Thirty-five men (mean±SD, age 69.9±4.0 years) exercised for 12 months and intervention adherence
was 90.5±9.1% (304±31 sessions completed out of 336 prescribed sessions). Fourteen men did not complete
the 12 month exercise intervention due to: health problems or injuries unrelated to the intervention (n=9),
time commitments (n=2), or discomfort during exercise (n=3), whilst BMD data were missing for one man.
Femoral neck BMD, BMC and cross-sectional area all increased in the EL (+0.7, +0.9 and +1.2 % respectively)
compared to the CL (−0.9,−0.4 and −1.2%); interaction effect Pb0.05. Although the interaction term was not
significant (P>0.05), there were significantmain effects of time for sectionmodulus (P=0.044) and minimum neck
width (P=0.006). Sectionmodulus increased significantly in the EL (P=0.016) but not in the CL (P=0.465); mean
change+2.3% and+0.7% respectively, whereasminimumneck width increased significantly in the CL (P=0.004)
but not in the EL (P=0.166); mean changes being +0.7% and +0.3% respectively.
Conclusion: A 12 month high impact unilateral exercise intervention was feasible and effective for improving
femoral neck BMD, BMC and geometry in older men. Carefully targeted high impact exercises may be suitable
for incorporation into exercise interventions aimed at preventing fractures in healthy community-dwelling
|Description: ||NOTICE: this is the author’s version of a work that was accepted for publication in Bone. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published at: http://dx.doi.org/10.1016/j.bone.2012.12.045|
|Sponsor: ||Funding for this study was provided by a
Loughborough University Studentship and Medical Research Council
(MRC) Interdisciplinary Bridging Award.|
|Version: ||Accepted for publication|
|Publisher Link: ||http://dx.doi.org/10.1016/j.bone.2012.12.045|
|Appears in Collections:||Published Articles (Sport, Exercise and Health Sciences)|
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