Document Detail


Equal BMD after daily or triweekly exercise in growing rats.
MedLine Citation:
PMID:  20029737     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The purpose of this study was to examine the efficacy of continuous resistance training (3 days/wk) compared to interrupted resistance training where 20-24 h separated an exercise bout (i. e. 6 days/wk) for enhancing bone mineral density (BMD) in growing male rats. The total volume of work performed per week between the two resistance training programs was equivalent by design. Young male rats were randomly divided into Control (Con, n=9), 3 days/wk resistance trained group (RT3, n=9), and 6 days/wk resistance trained group (RT6, n=9). The RT3 and RT6 groups were conditioned to climb a vertical ladder with weights appended to their tail for a total of 6 wks. After 6 wks, BMD (assessed via DXA) from the left tibia was significantly greater for RT3 (0.242+/-0.004 g/cm (2)) and RT6 (0.244+/-0.004 g/cm (2)) compared to Con (0.226+/-0.003 g/cm (2)). Further, serum osteocalcin (oc, in ng/ml) was significantly greater for RT3 (75.8+/-4.4) and RT6 (73.5+/-3.8) compared to Con (53.4+/-2.4). There was no significant difference in BMD or serum OC between RT3 and RT6 groups. The results indicate that both resistance training programs were equally effective in elevating bone mineral density in young, growing rats.
Authors:
B D Kayser; J K Godfrey; R M Cunningham; R A Pierce; S V Jaque; K D Sumida
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Publication Detail:
Type:  Journal Article     Date:  2009-12-22
Journal Detail:
Title:  International journal of sports medicine     Volume:  31     ISSN:  1439-3964     ISO Abbreviation:  Int J Sports Med     Publication Date:  2010 Jan 
Date Detail:
Created Date:  2009-12-23     Completed Date:  2010-03-17     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8008349     Medline TA:  Int J Sports Med     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  44-50     Citation Subset:  IM    
Copyright Information:
Georg Thieme Verlag KG Stuttgart, New York.
Affiliation:
Chapman University, Department of Biological Sciences, Orange, USA.
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MeSH Terms
Descriptor/Qualifier:
Amino Acids / urine
Animals
Bone Density / physiology*
Male
Osteocalcin / blood
Physical Conditioning, Animal / methods*
Random Allocation
Rats
Rats, Sprague-Dawley
Resistance Training / methods*
Tibia / metabolism
Time Factors
Chemical
Reg. No./Substance:
0/Amino Acids; 104982-03-8/Osteocalcin; 90032-33-0/deoxypyridinoline

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


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