O tempo e o percentual de alongamento estático influenciam a resposta mecânica do tendão? / How does static stretching influence the tendon s mechanical response

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

12/03/2012

RESUMO

Background: Stretching exercises basically aim at obtaining physiological and functional balance since they reduce tissue rigidity and seem to have a positive impact on lesion prevention. However, the parameters that govern the practice of stretching have not yet been standardized. The objective of this study was to analyze in vitro the mechanical response of bovine calcaneus tendons subjected to static stretching and also evaluate the influence of stretching on injury events. Methods: 6 groups of bovine calcaneus tendons (n=10) were formed according to the static stretching protocol: three different intervals (15, 39, 45 s) and initial stretching percentage (2.5% and 3.5%). The control group did not perform prior stretching. At the end of the stretching tests, the specimens were subjected to stress rupture tests. Findings: The values for force relaxation presented stability after the 30th second (p<0.0001) at both levels of deformation. Greater force relaxation (p<0.0026) and the least tensile strength (p=0.0123) was observed in the group that was subjected to the highest stretch percentage (3.5%). No difference was observed between the rupture parameters of the stretch and control groups. The variables, stretch duration and percentage did not demonstrate any interaction, suggesting the possibility of using only one of them to modulate tendon response to stretching. Interpretation: In relation to stress relaxation, the 30 second interval seems to be the most effective when stretching tendons. This fact should be considered when establishing new clinical stretching protocols.

ASSUNTO(S)

exercícios de alongamento biomecânica flexibilidade stretch exercise biomechanics flexibility

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