INTRODUCTION: The muscular tissue is able to respond stimuli such as immobilization that induces hypotrophy altering muscle performance and are important methods that aim to reverse these deleterious effects in the post-immobilization. OBJECTIVE: The aim of this study was to evaluate transverse and longitudinal histomorphometric parameters of the soleus muscle fibers of rats immobilized in the shortened position and submitted to remobilization by jumping in water. METHODS: It was used 24 rats divided into 3 groups: G1 - remobilized freely, G2 - remobilized with jumps daily, and G3 - jumps on alternate days. The immobilization and remobilization occurred in 2 weeks for the right limb. The variables analyzed were: muscle mass, muscle fiber diameter, length and series sarcomeres estimate along the muscle. RESULTS: There was a reduction in muscle mass for both groups, to the diameter there was difference in G1 and G3, to the muscle length no significant differences, however, for the series sarcomeres estimate was found significant changes in all the groups. CONCLUSION: The protocol used has partial action against the deleterious effects of immobilization.
muscles; immobilization; exercise
