Impacto do HIIT-multimodal no desempenho físico de atletas de futebol juvenil

Abstract

The aim of this study was to quantify the impact of multimodal HIIT (HIIT-MM) on the physical performance of soccer players. To this end, the literature review of this thesis was first presented to the scientific community in a narrative review format, which aimed to reinforce the conceptualization of mixed loads and explain their application in sports. Subsequently, a second study was conducted, which was an experimental study. Thus, 27 youth soccer players were randomized into a HIIT-MMsub (n=14) and HIIT-MMmax (n=13) group and were exposed to 14 weeks of training, where the first group performed a HIIT-MM protocol with submaximal strength stimuli and the second group performed maximal efforts. During the baseline, at week 7 and after the intervention, anthropometric variables (body mass and fat) were measured, in addition to physical performance through measures of maximum aerobic endurance (RAM), maximum oxygen consumption (VO2max), sprint speed of 10 (S10) and 20 m (S20), squat jump (SJ), countermovement jump (CMJ), lower limb power (LMP) and maximum dynamic strength in the bench press, squat and deadlift tests. For inference between groups, the statistical value adopted was 5%.. As a result, in both groups, no statistical differences were observed in the anthropometric variables (p > 0.05). On the other hand, both groups showed significant improvements after 14 weeks of training in the variables of RAM, VO2max, SJ, CMJ, LMP, bench press, squat and deadlift (p <0.001), with no differences between the groups (p > 0.05). However, only in the HIIT-MMsub group were significant performance increases identified in VO2max, S10, S20 between weeks 7 and 14. Thus, the present thesis concludes that HIIT-MM, whether performed with submaximal or moderate loads, in a period of 14 weeks, was able to generate, without distinction, performance in cardiorespiratory fitness, speed, jump height, lower limb power and maximum dynamic strength. However, only the HIIT-MMsub group was able to provide improvements in VO2max and speed between weeks 7 and 14.