Document Detail

Age-related changes in twitch properties of plantar flexor muscles in prepubertal children.
MedLine Citation:
PMID:  16183826     Owner:  NLM     Status:  MEDLINE    
The twitch of the triceps surae muscle (TS), which characterizes the contractile properties independently of volition, differs in amplitude, but not in time course, when evoked in pre or postpubertal children. The aim of the present study was to compare the TS twitch contractile properties in prepubertal children (7 to 11 y). M-wave and twitch were recorded at rest by supramaximal electrical stimulations of the posterior tibial nerve. Twitches were characterized by peak torque (Pt), contraction time (CT), half relaxation time (HRT), and rate of torque development (dPt/dt). Electromechanical delay (EMD) was quantified with regard to the TS M-wave onset. Pt values increased significantly with the age of the prepubertal children but remained lower than that for adult subjects. CT and HRT values did not change with age. Thus, dPt/dt increased significantly between the 7-year-old and the 11-year-old children but remained significantly lower than that for adults. Despite EMD values decreased with age, they remained significantly higher than those of adult subjects. These results confirmed the link between growth processes and the increase in twitch torque for prepubertal children within a limited range of age. However, the time-course characteristics were not affected by age. The increase in dPt/dt and the decrease in the EMD could be used as indirect indicators of changes in contractile kinetics and in musculo-tendinous stiffness with the age of the prepubertal children. The age-related relationships established by this study will serve as reference values for clinical testing of the TS performances in relation to muscle disease or disuse.
Jean-Francois Grosset; Isabelle Mora; Daniel Lambertz; Chantal Perot
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-09-23
Journal Detail:
Title:  Pediatric research     Volume:  58     ISSN:  0031-3998     ISO Abbreviation:  Pediatr. Res.     Publication Date:  2005 Nov 
Date Detail:
Created Date:  2005-10-31     Completed Date:  2006-01-04     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0100714     Medline TA:  Pediatr Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  966-70     Citation Subset:  IM    
Département de Génie Biologique, CNRS UMR-6600, Université de Technologie, Compiègne cedex, France.
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MeSH Terms
Aging / physiology*
Analysis of Variance
Muscle Contraction*
Muscle Relaxation
Muscle, Skeletal / physiology*

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