Efeitos da restrição do fluxo sanguíneo associada ao exercício de força sobre o dano muscular esquelético e o sistema cardiovascular

Abstract

Muscle damage is considered as one of the main mediators of the musculoskeletal adaptations provided by strength exercise (SE). However, it is hypothesized that low intensity PE (20-50% of 1RM) associated with restriction of blood flow (RFS) can provide similar adaptations regardless of whether or not muscle damage occurs. This study aimed to evaluate the effects of RFS associated with different protocols of strength exercise on skeletal muscle damage and cardiovascular system. Three different experimental protocols were evaluated: 1º) High-intensity eccentric strength exercise (HIEC, 130% of 1RM), in which the participants performed 3 sets of 10 maximal repetitions, in two conditions (with or without the BFR); 2º) Low-intensity strength exercise (LISE, 40% of 1RM), in which the participants performed 3 sets until muscle fatigue, also under conditions with or without the BFR; and lastly, 3º) Lowintensity strength exercise (LISE, 40% of 1RM), performed again 3 sets until muscular fatigue under different percentages of BFR (0, 40, 60 and 80%). Of the experimental protocol 1, we observed that the range of motion (ROM) decreased similarly in both exercise conditions immediately after exercise. However, only HIEC presented ROM reduced at the 24-hour post-exercise.