Document Detail

High impact exercise increased femoral neck bone mineral density in older men: a randomised unilateral intervention.
MedLine Citation:
PMID:  23291565     Owner:  NLM     Status:  MEDLINE    
INTRODUCTION: There is little evidence as to whether exercise can increase BMD in older men with 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 power.
PURPOSE: This study investigated the influence of a 12month high impact unilateral exercise intervention on femoral neck BMD in older men.
METHODS: Fifty, healthy, community-dwelling older men commenced a 12month high impact unilateral exercise intervention which increased to 50 multidirectional hops, 7days a week on one randomly allocated leg. BMD of both femurs was measured using dual energy X-ray absorptiometry (DXA) before and after 12months of exercise, by an observer blind to the leg allocation. Repeated measures ANOVA with post hoc tests was used to detect significant effects of time, leg and interaction.
RESULTS: Thirty-five men (mean±SD, age 69.9±4.0years) exercised for 12months and intervention adherence was 90.5±9.1% (304±31 sessions completed out of 336 prescribed sessions). Fourteen men did not complete the 12month 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 P<0.05. Although the interaction term was not significant (P>0.05), there were significant main effects of time for section modulus (P=0.044) and minimum neck width (P=0.006). Section modulus increased significantly in the EL (P=0.016) but not in the CL (P=0.465); mean change +2.3% and +0.7% respectively, whereas minimum neck 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 12month 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 older men.
Sarah J Allison; Jonathan P Folland; Winston J Rennie; Gregory D Summers; Katherine Brooke-Wavell
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't     Date:  2013-01-03
Journal Detail:
Title:  Bone     Volume:  53     ISSN:  1873-2763     ISO Abbreviation:  Bone     Publication Date:  2013 Apr 
Date Detail:
Created Date:  2013-03-04     Completed Date:  2013-09-03     Revised Date:  2014-02-20    
Medline Journal Info:
Nlm Unique ID:  8504048     Medline TA:  Bone     Country:  United States    
Other Details:
Languages:  eng     Pagination:  321-8     Citation Subset:  IM    
Copyright Information:
Copyright © 2013 Elsevier Inc. All rights reserved.
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MeSH Terms
Absorptiometry, Photon
Bone Density / physiology*
Exercise / physiology*
Femur Neck / radiography*
Grant Support
G0502250//Medical Research Council; //Medical Research Council

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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