Comportamento viscoelastico de tendões do musculo gracil e semitendineo humano e tendão calcaneo bovino

AUTOR(ES)
DATA DE PUBLICAÇÃO

2003

RESUMO

This research work presents an experimental study on the mechanical behavior of human gracilis and semitendineous muscle tendon and as well as bovine calcaneous tendons. The static relaxation tests consisted in applying a deformation of 2.5% of the total length for a time interval of 600s, leaving the specimens to rest for 300s before a new application of a similar test. A total number of 03 cyclic relaxation tests with 10 cycles respectively at 2.5%, 3.0% and 4.0% of deformation have been performed for each specimen. The specimens were kept at rest for 300s between the tests. Deformation rate for both cyclic and static relaxation tests were maintained at 10% of the initial length per second. After the relaxation tests each specimen was submitted to a uniaxial traction to failure at a deformation rate of 3.85 mm/s. Obtained results were submitted to an analysis of variance of split-plot in time design with randomized blocks (the tendons) in the plots. Static relaxation tests carried on all tendons showed a statistically significative difference between the forces at the beginning as well as the forces at the instants correspondent to 300s and 600s of the tests. This fact clearly emphasizes the occurrence of a force relaxation phenomena. Average relaxation force values obtained from the trials 1 and 2 was significative as well except for the semitendinous human tendon. Cylcic relaxation tests carried on all tendons showed that the average force correspondent to the first cycle was statistically significatively greater than the average force correspondent to the tenth cycle. This also emphasizes the occurrence of a force relaxation phenomena. For all tested tendons the average force corresponding to 4.0% deformation level showed to be significative greater than the average forces corresponding to 2.5% and 3.0% of deformation level. The ideal force for pre-tension procedure is close related to the time parameter because the viscoelastic behavior of tendons as well as ligaments are clearly evident

ASSUNTO(S)

tendões

ACESSO AO ARTIGO

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