Background: The high velocity repetitions training has been used for anaerobic capacity development, and it can cause several adaptations. However, the interval and the type of recovery between repetitions could be a crucial role in these adaptations. Aim: To investigate the effects of three types of recovery between six high velocity repetitions in the swimming mechanics. Methods: Fourteen athletes aged 13 to 17 at state and national level performed six maximal repetitions of 50 m in front crawl swimming with three minutes of recovery between them. In each session, one of the three recovery types was conducted in a randomized manner, separated by at least 48 hours: 1) passive recovery in the vertical position in the water (PR); 2) bubble breathing recovery at the pool edge, (inhalation out of the water and exhalation underwater) with full head submersion at self-selected frequency (BBR); 3) active recovery through swimming at 40% of the maximum 100-m velocity (ARS). Each repetition was timed manually and filmed for biomechanical analysis. The research was approved by the Research Ethics Committee of the Federal University of Mato Grosso (CAAE: 71430523.4.0000.8124). A Two Way Anova was used for statistical analysis. Results: Repetition time increased by 4,25% from the fourth repetition onward (p<0.001) and was lowest in PR (p=0.016). Stroke cycle frequency decreased by 2,70% in the fourth repetition compared with the first repetition (p<0,001), with ARS showing the smallest values (p=0,001). The stroke length has not changed throughout the repetitions (p=0,135), and ARS condition showing the highest values (p=0,013). The stroke index decreased 3,55% from the third repetition compared with the first repetition (p<0.001), with no main effect to condition. The stroke propulsive efficiency was not affected throughout the repetitions (p = 0,126), however, a significant main effect of condition was found (p = 0,006), with greater values for ARS. Conclusions: Despite the similar time*performance across conditions, ARS produced higher stroke efficiency and distance per cycle.
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