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High Volumes of Resistance Exercise Are Not Required for Greater BMD during Growth.
MedLine Citation:
PMID:  22843104     Owner:  NLM     Status:  Publisher    
PURPOSE: The purpose of this study was to determine the minimum amount of resistance exercise that would stimulate bone formation, via an elevation in bone mineral density (BMD), during the growth period in male rats. METHODS: Forty male rats were randomly divided into Control (Con, n=8), 1 ladder climb resistance trained group (1LC, n=8), 2 ladder climb resistance trained group (2LC, n=8), 3 ladder climb resistance trained group (3LC, n=8), and 4 ladder climb resistance trained group (4LC, n=8). All exercised groups were conditioned to climb a vertical ladder with weights appended to their tail 3 days/wk for a total of 6 wks. RESULTS: After 6 wks, left tibia BMD (mean ± SE) was significantly greater for 2LC, 3LC, and 4LC (0.233 ± 0.003 g/cm) when compared to Con (0.218 ± 0.003 g/cm). Left femur BMD was significantly greater for 2LC, 3LC, and 4LC (0.318 ± 0.003 g/cm) when compared to 1LC (0.299 ± 0.008 g/cm) and Con (0.289 ± 0.010 g/cm). There were no significant differences in BMD between 2LC, 3LC, and 4LC groups. CONCLUSION: The results suggest that during growth, a low amount of resistance exercise was just as effective as high volumes of strength training for stimulating bone modeling.
Cammie P Ahles; Harpreet Singh; Woojin Joo; Yvonne Lee; Lucy C Lee; William Colazas; R Ander Pierce; Anuradha Prakash; S Victoria Jaque; Ken D Sumida
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-7-26
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  -     ISSN:  1530-0315     ISO Abbreviation:  -     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-7-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
1Chapman University, Schmid College of Science & Technology, Orange, CA 2California State University, Northridge, Department of Kinesiology, Northridge, CA.
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