Análise do tempo sob tensão, volume total de treino, índice de fadiga e variáveis mecânicas no exercício supino reto realizado em diferentes intervalos de recuperação

Abstract

Objective: to analyze the time under tension, total training volume, fatigue index and mechanical variables in the bench press exercise using different recovery intervals. Methods: A systematic review and two experimental articles were carried out to understand the time under tension (TUT) in the bench press exercise and its relationship with the use of different recovery intervals (RI). In each experimental study, two protocols of 5 series with up to 10 maximum repetitions were applied, divided into two meetings, with randomized entry and with different RI (1 minute - C1M and 3 minutes - C3M). The TUT and the maximum number of repetitions (NR) were recorded for both articles. In the first experimental study, the values of total training volume (TTV) and fatigue index (FI) were calculated. For the second experimental study, the mechanical variables total work (TW), power (PW) and mean velocity (MV) were recorded. Results: from the systematic review, it was possible to observe that the TUT varied in behavior according to the use of different methods and training protocols used by the included studies. Thus, the possible prediction of the TUT in the execution of the bench press exercise would be connected to the way that this exercise would have been prescribed. The first experimental article found a lower TUT in series 5 (p<0.001) for C1M when compared to C3M, with no significant difference for the other 4 series. NR for C1M was lower when compared to C3M in sets 3 (p=0.018), 4 (p=0.023) and 5 (p<0.001), with no significant difference in sets 1 and 2. The FI was higher for C1M (p< 0.001); however, TTV was higher for C3M (p=0.007). The second experimental article demonstrated that the TUT was higher in C3M when compared to C1M in series 5 (p<0.001). NR was greater for 3 minutes compared to C1M in sets 3 (p=0.016), 4 (p=0.021) and 5 (p<0.001). TW was higher in C3M when compared to C1M in series 3 (p=0.005), 4 (p=0.007) and 5 (p<0.001). MV was higher for C3M compared to C1M in series 4 (p=0.029) and 5 (p<0.001). For C3M, PW was higher compared to C1M in series 4 (p=0.044) and 5 (p<0.001). Conclusion: The behavior of the TUT varies according to the prescription of the bench press exercise; however, it is not always that it follows a pattern of behavior related to the NR. These differences found between the two variables demonstrate possible differences in their use as training volume quantification metrics. Different RI influenced the maintenance of TUT and NR throughout the series performed, although C3M has shown less negative effect on performance than C1M. Longer RI showed greater ability to maintain TTV and less deleterious effect accumulated by fatigue. During the series, it was possible to observe a reduction in the MV of the movement, which clarified the possible reason for the divergence in behavior between the TUT and the NR. The TW also reduced throughout the series, possibly due to the reduction of the NR performed.