5 10 5 shuttle run8/15/2023 7, 8 In this sense, changes of direction have been introduced in some RSA tests and during repeated sprint training sessions. In addition, the ability to change direction has also been considered as an important prerequisite for performance in team sports. In futsal it is possible find tests ranging sprint distance, number of repetitions, duration of the interval between sprints and characteristic of recovery (active or passive). In order to evaluate the physiological demand in the RSA, several tests have been proposed. 1 The ability to repeat these sprints of high-intensity and short duration following short recovery periods has been called repeated sprint ability (RSA), 5 and has been considered as one of the main components of physical fitness in team sports. 4 Besides, a recent study has showed that professional futsal players during actual match spent 5–12% of game-time sprinting and performing high-intensity running (speed >15 km h −1). Time-motion analysis of team sports has revealed that decisive moments in a match are often preceded by short, high-intensity sprints in the range of 10–30 m or 2–4 s. 1, 2, 3 Considering the total time of effort, the predominant metabolism during a futsal game is the aerobic, however, in the decisive actions that is needed perform short and intense efforts, the anaerobic metabolism is the main source to the energy supply. Moreover, both the glycolytic and neuromuscular demand did not differ between the two sprints models.įutsal is an intermittent and acyclic sport, in which several types of actions demanding the contribution of the different energy systems are performed. It was concluded that, despite the differences in BT and MT in the two models of repeated sprints, the MT in both tests correlated well, suggesting that repeated sprint ability is a general quality and independent of changing direction. No significant differences were found between CMJ performance ( P = 0.08) and LAC PEAK ( P = 0.09) and post-RSL and post-RSS. Significant differences in CMJ performance were recorded between baseline and post-RSL ( P = 0.01), as well as between baseline and post-RSS ( P = 0.02). Significant correlations were found between MT RSL and MT RSS ( r = 0.79), as well as between BT RSL and BT RSS ( r = 0.69). The mean time (MT) and best time (BT) were lower in the RSL ( P < 0.01), while the fatigue index was lower in the RSS ( P = 0.02). The sprint performances (mean time, best time and fatigue index), countermovement jump (CMJ) performance were evaluated before and after both tests, as well as measuring blood lactate concentrations (LAC PEAK) after the sprints. Material and methodsįourteen male futsal players performed 25 m sprints in a straight line and with a change of direction. The aim of the present study was to compare and analyze the performance in the shuttle (RSS) and straight line (RSL) repeated sprint running and to compare the physiological and neuromuscular responses obtained post-RSL and post-RSS.
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