Bioquimica e biomecanica dos tendões flexores digitais de frangos

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

Tendons have function of transmitting tension forces from musc1e to bones. The tendinous connective tissue changes their mechanical and structure properties in response to stress alteration as a phenomenon of functional adaptation and optimal operation. The peculiar characteristic of connective tissue is the presence of collagen in the extracellular matrix, providing the mechanical tissue integrity. The tendons are composed by a combination of collagen fibres and proteoglycans. In this study Hy-line chickens were randomly divided in two groups. One group was maintained in cages and the other group was raised in a wide environment. The animals were killed with 60 days old and the deep and superficial digital flexor tendons were analysed to identify the biochemical aspects and the mechanical behaviour. For the biochemical study the superficial digital flexor tendon was divided in proximal, intermediate and distal region. The proximal and intermediate regions bear compressive forces while the distal region withstands tensional forces. About the deep tendon was studied the intermediate region that receive on1y tensional forces. Comparing the two groups of animals and the several tendons regions, it was found a larger amount of proteins, collagen and glycosaminoglycans, in animals raised free than animals raised in cages. The chodroitin sulfate was prominent in compressive regions while dermatan sulfate was detected in tensional regions. The small proteoglycans, decorin and fibromodulin, were isolated and identified by analysis of N-terminal segments. A more expressive presence of decorin and fibromodulin were observed in chickens raised free, in relation to the caged chikens. The superficial tendons of both animals groups were submitted for tensile test and it was observed that the tendons of free animals showed more resistance to the tension, less deformation as the load increases and more displacement. Our biochemical and biomechanical studies showed that the physical exercise have positive effect on the strengthening of the tendons

ASSUNTO(S)

tendões frango de corte proteoglicanos

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