Efeito da manobra de condicionamento isquêmico e da restrição do fluxo sanguíneo pós-exercício na recuperação do desempenho muscular isométrico

Abstract

The search for strategies that promote increased sports performance has received attention from researchers in the sports scene. Among these strategies, post-exercise ischemic conditioning has stood out due to its low cost and easy application. Some sports, mainly in the Grappling modality, have as characteristics a high demand for isometric strength, high volume of fights and little recovery time between fights during championships, thus decreasing the production of isometric strength. Thus, the aim of this study is to assess the effect of ischemic conditioning and partial blood flow restriction after exercise on performance recovery after an isometric fatigue protocol. Twenty-nine men who were recreationally trained in strength exercise after performing an isometric fatigue protocol in knee extension [Resistant strength (RS), 8 sets of 20 seconds for 10 seconds of recovery between sets], were submitted to 1 3 interventions: a) Ischemic post-conditioning [IPE, 3 cycles of 2-min ischemia (20 mmHg above the individual occlusion pressure) for 2-min of reperfusion (0 mmHg)]; b) Placebo [SHAM, 3 cycles of 2-min pseudo occlusion (20 mmHg followed by 2-min reperfusion 0 mmHg)]; and c) post-exercise blood flow restriction [BRPE, 3 cycles of 2-min restriction (100 mmHg) for 2-min reperfusion (0 mmHg)]. The variables analyzed were the maximum voluntary isometric contraction (MVIC), RF, oxygenation and muscle hemoglobin and noticeable scales. After the fatigue protocol, an attenuation of the drop in performance was observed only for the BRPE group in the variables: MVIC and RS (p = 1.00; TE = 0.20, p = 0.760; TE = 0.26, respectively) , the other IPEO and SHAM groups significantly reduced MVIC (IPEO p = 0.009; TE = 0.38 and SHAM p = 0.03; TE = 1.08) and RS (IPEO p = 0.034; TE = 0.29 and SHAM p = 0.018; TE = 0.62). The other variables did not show significant differences (p> 0.05) within and between groups. BRPE can be an efficient strategy for maintaining the performance of isometric actions with a duration of 20 seconds and a short recovery interval.