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Differential adaptations during growth spurt and in young adult rat muscles

Published online by Cambridge University Press:  01 January 2009

K. M. F. T. Barros*
Affiliation:
Departamento de Nutricao, Centro de Ciências da Saúde, Universidade Federal de Pernambuco, Av. Moraes Rego 1235, 50670-901 Recife, PE, Brazil Departamento de Fisioterapia, Centro de Ciências da Saúde, Universidade Federal de Pernambuco, Av. Moraes Rego 1235, 50670-901 Recife, PE, Brazil Département de Génie Biologique, UMR CNRS 6600, Université de Technologie de Compiègne, BP20529, F-60205 Compiègne cedex, France
R. Manhaes-de-Castro
Affiliation:
Departamento de Nutricao, Centro de Ciências da Saúde, Universidade Federal de Pernambuco, Av. Moraes Rego 1235, 50670-901 Recife, PE, Brazil
F. Goubel
Affiliation:
Département de Génie Biologique, UMR CNRS 6600, Université de Technologie de Compiègne, BP20529, F-60205 Compiègne cedex, France
F. Canon
Affiliation:
Département de Génie Biologique, UMR CNRS 6600, Université de Technologie de Compiègne, BP20529, F-60205 Compiègne cedex, France
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Abstract

During the post-weaning growth and maturation period (25/90 days after birth), rat limb muscles are submitted to specific adaptations. Our aim was to characterize the mechanical properties of two muscles that are opposite in terms of fibre-type distribution, the soleus and the extensor digitorum longus (EDL) muscles of male Wistar rats. Results showed a fast-to-slow fibre-type transition in soleus while no modification in fibre-type distribution was observed in EDL. A growth-induced increase in muscle force was observed. Soleus underwent an increase in twitch kinetics, but EDL showed no modification. Resistance to fatigue was higher in 90-day-old soleus but not modified in the EDL. Surprisingly, analysis of maximal shortening velocity showed a decrease in both soleus and EDL. Finally, tension/extension curves indicated a growth-induced increase in series elastic stiffness in the two muscles. These results suggest that during this growth period, skeletal muscles are submitted to differential adaptations. Moreover, whereas adaptation of biomechanical properties observed can be explained partly by an adaptation of fibre profile in soleus, this is not the case for EDL. It is suggested that changes in muscle architecture, which are often disregarded, could explain some variations in mechanical properties, especially when muscles undergo an increase in both mass and length.

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Full Paper
Copyright
Copyright © The Animal Consortium 2008

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