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Peripheral QCT sector analysis reveals early exercise-induced increases in tibial bone mineral density.
MedLine Citation:
PMID:  22947547     Owner:  NLM     Status:  In-Data-Review    
Objectives: The purpose of this controlled trial was to determine whether subtle changes in mineralization and geometry of the tibia were evident following short term exercise interventions. Methods: Fifty-seven female volunteers (age 20.1∓1.6) were randomized to one of four, 13-week training groups: sedentary control, resistance training, aerobic training, or combined aerobic-resistance. A pQCT image analysis software was developed and used to analyze images taken at sites 4%, 38% and 66% from the distal tibia at baseline and at completion of training. Parameters of bone mineral density, geometry and strength were determined for the entire scan cross-section and for each of six 60(o) polar sectors. Repeated-measures ANOVA and Fisher's LSD post hoc tests analyzed the effects of training over time. Results: Trabecular density (TrDn) at the 4% site increased from 279.8∓37.1 to 283.1∓36.0 mg/cm(3) in the aerobic group, and from 285.1∓24.6 to 287.5∓22.9 mg/cm(3) in the combined group over the study period (P≤0.001). Regional sector analyses revealed that impact exercises resulted in localized changes to the medial aspect of the tibia. Small increases in total bone area were observed in the diaphysis (38% site) (P<0.05). Conclusions: Subtle, regional increases in trabecular density may be an early measurable manifestation of bone quality changes.
R K Evans; C H Negus; A J Centi; B A Spiering; W J Kraemer; B C Nindl
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of musculoskeletal & neuronal interactions     Volume:  12     ISSN:  1108-7161     ISO Abbreviation:  J Musculoskelet Neuronal Interact     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-09-05     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101084496     Medline TA:  J Musculoskelet Neuronal Interact     Country:  Greece    
Other Details:
Languages:  eng     Pagination:  155-64     Citation Subset:  IM    
U.S. Army Research Institute of Environmental Medicine, Natick, MA.
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