Efeitos da potencialização pós tetânica induzida por eletroestimulação de membros inferiores nos marcadores de salto vertical em mulheres fisicamente ativas

Abstract

Electrostimulation protocols to induce post-tetanic potentiation still lack clarity in scientific literature. This study investigated the effectiveness of stimulating a specific muscle group to promote an acute increase in lower limb muscle power. The sample consisted of 12 physically active women, with a mean age of 22.75 ± 3.62 years, divided into three groups: a) control, where participants only performed standardized warm-up for all protocols; b) electrostimulation + isometric exercise; c) electrostimulation + dynamic exercise. At the end of each protocol, countermovement jump height on the force platform was recorded after 2 and 4 minutes of the conditioning activity. Repeated measures analysis of variance (ANOVA) was used to assess potential differences between protocols and analysis times. No significant differences were found among the three conditions for jump height data: protocol (a) vs. (b) (2 min: 19.92 ± 2.62 vs. 21.46 ± 3.44 [+1.54] cm); (4 min: 21.41 ± 3.71 vs. 21.68 ± 4.81 [+0.27] cm); (a) vs. (c) (2 min: 19.92 ± 2.62 vs. 21.32 ± 4.39 [+1.40] cm); (4 min: 21.41 ± 3.71 vs. 20.41 ± 3.17 [-1.00] cm); (b) vs. (c) (2 min: 21.46 ± 3.44 vs. 21.32 ± 4.39 [0.14] cm); (4 min: 21.68 ± 4.81 vs. 20.41 ± 3.17 [1.27] cm); and also for maximum relative power data (a) vs. (b) (2 min: 3.75 ± 0.41 vs. 3.99 ± 0.50 [+ 0.24] W); (4 min: 3.92 ± 0.50 vs. 4.07±0.54 [+0.15] W); (a) vs. (c) (2 min: 3.75 ± 0.41 vs. 3.93 ± 0.57 [+0.18] W); (4 min: 3.92 ± 0.50 vs. 3.81 ± 0.44 [-0.11] W); (b) vs. (c) (2 min: 3.99 ± 0.50 vs. 3.93 ± 0.57 [0.06] W); (4 min: 4.07±0.54 vs. 3.81 ± 0.44 [0.26] W). These results suggest that post-tetanic potentiation protocols designed for the lower limbs (glutes, anterior and posterior thigh) in this study were not effective in improving vertical jump performance in physically active women.