Purpose. To verify whether there are changes in the performance levels of the explosive force when the same muscle group previously under went different intensities of flexibility training (stretch & flex). Basic procedures. The tests were performed with 25 females on three consecutive days and were preceded by a 10minute warmup period. First, each participant performed a maximum vertical jump on a contact platform. The jump was repeated after 10 minutes, and the first day was considered the control (C). On the second day, a routine of stretching exercises (S) was included, and on the third day, the same routine, but intensified with a maximum static stretching exercises (flexibilizing -F), was used. main findings. The height reached in the control jump decreased by 0.17%, showing no influence on the performance when the jump happened on the same day, with a timeinterval of only 10 minutes ( p = 0.903). On the day of the stretching routine, there was a reduction of 3.6% ( p = 0.001), and on the third day with flexibilizing, there was a 6.8% reduction ( p = 0.001). A comparison of the groups showed no significant differences between them. Conclusions. The jumps after the two stretching routines were significantly lower. Submaximal or maximal (flexibilizing) stretching exercises reduced the explosive force of vertical jumps, although the differences between the training intensities were not significant.

SummaryStudy aim: To assess the acute effect of the proprioceptive neuromuscular facilitation method (PNF) on the explosive strength of lower extremities of male soldiers. Material and methods: A group of 26 male soldiers performed two exercise sessions on different days, in a random order: without stretching (control exercise) or by applying PNF (experimental exercise). Before and after the PNF (0, 10, 20, 40 and 60 min), 3 vertical counter-movement jumps on a tensometric platform were executed. Results: CMJ results in the experimental sessions were significantly (p<0.001) decreased after the PNF exertion in relation to the initial (pre-session) value. No significant post-session decreases were found in the control exercise. However, the differences between the experimental and control results were significant (p<0.05) only immediately after the PNF exertion and 10 min later. Conclusion: The PNF method negatively affects the vertical jump performance and, thus, ought not to be used as part of warm-ups.

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Os objetivos deste estudo foram analisar o impacto da paralisação pela pandemia no humor e na rotina de atletas de alta performance durante o isolamento social, e após o retorno às práticas esportivas, com base nos testes realizados em um clube profissional. Também comparar carga de treinamento e incidência de lesões em temporada prévia, com aquela realizada durante a pandemia da COVID-19. Foram incluídos 14 membros de uma equipe profissional masculina de voleibol em Juiz de Fora – MG, durante o período de dezembro/2020 a março/2021. Os atletas selecionados foram acompanhados durante a temporada regular de 2020/2021. Foram excluídos atletas masculinos da equipe que não compõem o time profissional e atletas do time feminino de qualquer categoria. Para efeito de comparação da carga de treino e da incidência de lesões entre as temporadas 2018/2019 e 2020/2021, foram obtidos dados históricos do próprio clube. Obteve-se como resultado que a carga de treino foi 58,2% menor quando comparada a temporada 2020/2021 a de 2018/2019. A perturbação total do humor decresceu ao longo do seguimento em 2020/2021, especialmente em indivíduos com maior tempo profissional. O número total de lesões diminuiu de 41, em 2018/2019, para 22, em 2020/2021, provavelmente pela menor carga de treino. Em suma, a pandemia, resultou em impactos negativos na carga de treino dos atletas analisados. Contudo, constatou-se que a perturbação total do humor (PTH) teve redução progressiva de seus níveis com o retorno às práticas esportivas. Este estudo traz associações significativas sobre a relação entre o afastamento dos atletas profissionais, seus índices de humor (PTH) e desempenho (carga de treino) no retorno às atividades.