Reprodutibilidade do tempo sob tensão e de variáveis mecânicas no treinamento resistido de alta intensidade

Abstract

This dissertation is composed of three studies and adopts the Scandinavian model. The first study, a systematic review, aimed to analyze the maximum number of repetitions performed at different percentages of 1 repetition maximum (1RM) in young men practicing resistance training (RT) and concluded that the number of maximum repetitions performed in resistance training based on percentages of 1RM in young men practicing RT may be influenced by training variables such as exercise selection, execution order, recovery interval and movement execution time. The second study aimed to analyze the time under tension (TST) and the number of maximum repetitions performed in the knee extension movement on the leg extension machine in a high-intensity series and concluded that the TST varied significantly between individuals, even when performed in the same exercise and at the same intensity, even in the same number of repetitions reflecting different repetition execution strategies, both in the concentric and eccentric phases. The third study aimed to analyze the reproducibility of the TST and mechanical variables in high-intensity RT and concluded that the variables number of repetitions, concentric TST, concentric angular velocity and concentric angular acceleration were the only ones capable of maintaining reproducibility between the test moment and the reproducibility moment. However, during the experimental protocol (along the 4 series), none of the variables analyzed were able to maintain reproducibility, indicating the difficulty of individuals in preserving mechanical characteristics throughout subsequent high-intensity series. In addition, it was observed that each individual uses a repetition strategy (TST in each phase) differently, which makes it difficult to quantify the training volume based only on the number of repetitions, series and overload. Therefore, this dissertation concluded that the RT is influenced by different variables, such as exercise selection, execution order, recovery interval and movement execution time. Although RT planning is traditionally based on the number of sets, maximum repetitions directly or when they represent percentage values of 1RM that determine the overload, it is also important to consider the TST variable during the organization and planning of the training. Since each individual can adopt different strategies for executing the repetition, increasing or decreasing the time in each phase of the movement, even with the same number of repetitions, which can have an impact on the mechanical variables, especially over subsequent sets. Therefore, it is essential that Physical Education professionals consider the number of repetitions, overload and TST in an integrated manner in their planning, allowing for a more precise and individualized RT