Document Detail

Swimming training increases the post-yield energy of bone in young male rats.
MedLine Citation:
PMID:  19957166     Owner:  NLM     Status:  MEDLINE    
The purpose of this study is to investigate the effects of non-weight-bearing exercise on growing bone. Male Wistar rats (7 week-old) were assigned to one baseline control group, one control group and two swimming training groups, which were trained with 2 and 4% body-weight mass added, respectively. After an 8-week training period, three groups showed significant development compared to the baseline control group. Among the three 15-week-old groups, swimming-trained rats were lower in body weight (BW), densitometry and size-related measurements. In femoral biomechanical testing, swimming training groups were significantly lower in yield moment and ultimate moment, which may be due to a significantly lower long bone cross-sectional moment of inertia. However, the two swimming groups were higher in post-yield energy absorption and displacement. Further, in estimated tissue-level biomaterial properties, no differences were shown in yield stress, strain or toughness among the three groups. Using BW as a covariate, results of ANCOVA showed no differences in size-related parameters among the three groups, and some parameters were even higher in the two swimming groups. Regarding Pearson's correlation, size-related parameters correlated well to BW and whole bone strength but not to tissue post-yield behaviors. In conclusion, when compared to age-matched control group, swimming rats showed lower bone strength and lower yield energy absolutely at the structural level, but similar yield stress and yield toughness at the tissue level. Moreover, swimming training benefited growing bone in post-yield behaviors. Further studies should investigate the parameters that contribute to this exercise-induced post-yield behavior.
Tsang-Hai Huang; Sandy S Hsieh; Shing-Hwa Liu; Feng-Ling Chang; Shang-Chih Lin; Rong-Sen Yang
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-12-03
Journal Detail:
Title:  Calcified tissue international     Volume:  86     ISSN:  1432-0827     ISO Abbreviation:  Calcif. Tissue Int.     Publication Date:  2010 Feb 
Date Detail:
Created Date:  2010-01-21     Completed Date:  2010-04-20     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7905481     Medline TA:  Calcif Tissue Int     Country:  United States    
Other Details:
Languages:  eng     Pagination:  142-53     Citation Subset:  IM    
Institute of Physical Education, Health and Leisure Studies, National Cheng-kung University, Tainan, Taiwan.
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MeSH Terms
Age Factors
Biomechanics / physiology
Body Weight / physiology
Bone Density / physiology
Bone Development / physiology*
Bone Regeneration / physiology*
Bone and Bones / physiology*
Energy Metabolism / physiology
Exercise Therapy / methods*
Femur / physiology
Models, Animal
Physical Conditioning, Animal / physiology*
Rats, Wistar
Stress, Mechanical
Swimming / physiology*
Weight-Bearing / physiology

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