Efeitos do estatuto posicional, tempo de jogo e variáveis contextuais sobre o pico de desempenho físico e o comportamento tático de atletas profissionais da elite do futebol brasileiro

Abstract

The aim of this dissertation was to analyze the effects of positional status, playing time and contextual variables on the peak physical performance and tactical behavior of professional players from the elite of Brazilian football. The dissertation consisted of two original studies. For the first study 29 games were analyzed and for the second study 17 games were analyzed. Players were tracked by GPS device (Viper pod, STATSports, Belfast, UK). After the games, the files in CSV format spreadsheets were analyzed in a Matlab environment (The MathWorks Inc., Natick, USA). To analyze the peak physical performance, the moving average procedure was used in different time windows (1 minute, 3 minutes and 5 minutes), for the variables, total distance, running at high intensity (>5.5m/s), high intensity accelerations (>2m/s) and decelerations (>2m/s). For the analysis of tactical behavior, linear variables were calculated: Distance from the last defender to the goal; Width and length; Width and Length Ratio (LpWratio); Spread; Space exploration index; Strech index. Contextual variables were considered: 1) playing time; 2) match location; 3) final outcome; 4) momentary outcome; 5) level of the opponent, for study one, the player positional status was also included. influenced by positional status, playing time, final and momentary results, as well as the opponent's level. Also, tactical behavior suffers effects from game time, final and momentary outcome, as well as the opponent's level. It is concluded that contextual variables influence both peak physical performance and tactical behavior of elite Brazilian soccer players