ANÁLISE DE FACTORES POTENCIADORES E INIBIDORES DA VELOCIDADE E PRECISÃO DE REMATE EM ESTUDANTES DE CIÊNCIAS DO DESPORTO, JOGADORES DE FUTEBOL E DE FUTSAL

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Publications

The effects of fatigue and task knowledge duration on kicking performance and pacing strategies in soccer

Publication . Ferraz, Ricardo Manuel Pires; Marques, Mário António Cardoso; Tillaar, Roland van den

Interest in the topic of fatigue in sports science has a long history and recent research and theories have highlighted the problem of fatigue more broadly. A new perspective seems to have emerged supported by the concept of the brain acting as a central master regulator of exercise performance. This kind of regulation is named “pacing” and nowadays is assumed as an important concept in sport and exercise, supporting this psychophysiological perspective. Having prior knowledge about the activity is a central point on this view of pacing, based on the principle that athletes are then able to self-regulate their own performance through the entirety of the exercise. However, the precise importance of the psychophysiological perspective in context of training (exercises) or competition remains unclear, especially in team sports as a soccer. The general aim of this thesis was to analyze the effects of fatigue and task knowledge duration on kicking performance and pacing strategies in soccer. For the accomplishment of these purposes the following sequence was used: (i) reviewing the available literature; (ii) demonstrating the effects of fatigue on kicking ball velocity in soccer players; (iii) investigating the influence of fatigue upon kicking performance of soccer players and examining the effect of the knowledge of the exercise duration upon these two parameters; (iv) investigating the influence of different exercise intensities on kicking accuracy and velocity in soccer players and analyzing the player pacing strategies from different prescribed intensities; (v) investigating the possible influence of knowledge of exercise duration on player pacing strategies during soccer small-sided games (5 vs 5). The main conclusions drawn were (i) there is potential negative fatigue effect induced by high intensity exercises on kicked-ball velocities in soccer; (ii) the effect of fatigue can be variable; (iii) kicking accuracy is not affected by fatigue considering the accuracy as a secondary aim in relation with kicking velocity; (iv) no effects of knowledge of the exercise duration were found on kicking performance, but in respect of pacing strategies during soccer small-sided games, the findings showed its relevance. In addition, the results support the hypothesis about the involvement of psychophysiological factors and they express the complexity of the fatigue phenomenon and the relevance of the theory of central master regulation of the brain on exercise performance.

2016-07Doctoral thesis

Open access

Effects of knowing the task duration on players' pacing patterns during soccer small-sided games

Publication . Ferraz, Ricardo; Gonçalves, Bruno; Tillaar, Roland Van Den; Rodríguez Jiménez, Sergio; Sampaio, Jaime; Marques, Mário C.

The aim of this study was to identify the influence of prior knowledge of exercise duration on players' pacing patterns during soccer small-sided games. Twenty semi-professional male soccer players participated in this study. In the first game scenario, players were not informed how long they would be required to play the small-sided game and the activity was terminated after 20 min (Unknown Condition). In the second game scenario, players were told that they would play the small-sided game for 10 min, but immediately after completing the 10-min game, they were asked to complete another 10 min (Partially Condition). In the third game scenario, players were instructed that they would play the small-sided game for 20 min and then they completed the 20-min game (Known Condition). The results presented a tendency of higher values in all performance variables in the [0'-10'] min compared with the [10'-20'] min. As the players' previous knowledge about the tasks duration increased, the performance between two moments tended to be similar. Considering the entire 20-min game duration, the Partially Condition of the exercise was the most demanding condition. In conclusion, the knowledge of shorter durations of the exercise seems to lead to an increase of exercise duration demand, and longer exercise durations possibly tend to decrease differences between full knowledge and not knowing the exercise duration.

2018-01Journal article

Open access