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- Effects of changing the head coach on soccer team’s performance: a systematic reviewPublication . Sousa, H.; Clemente, F. M.; Gouveia, E. R.; Field, Adam; Sarmento, H.Review question / Objective: The aim of this systematic review is to analyze the effects of changing the soccer head coach on the overall team’s performance, locomotor demands of players, technical/tactical responses of players, and psychological responses of players. Eligibility criteria: P: Among professional soccer players what is the effect of head-coach replacement; E: Exposure to the change of the head-coach; C: Last weeks of the fired head coach compared with the first weeks of the new head-coach; O: locomotor performance, sports results, mental health metrics. Inclusion criteria will be: (1) articles written in English; (2) carried out in professional football teams. Studies will be excluded if: (1) written in another language other than the one selected; (2) in the case of theses, books and non scientific articles.
- The Relationship between Different Large-Sided Games and Official Matches on Professional Football Players’ Locomotor IntensityPublication . Caldeira, Romualdo; Gouveia, Élvio Rúbio; Ihle, Andreas; Marques, Adilson; Clemente, Filipe Manuel; Lopes, Helder; Henriques, Ricardo; Sarmento, HugoLarge-sided games (LSG) are commonly used in the training contexts for providing ei ther technical/tactical or locomotor/physiological stimuli. Despite natural similarities with the official match, the locomotor profile seems to be different, which must be considered by the coaches to identify compensatory strategies for achieving the ideal dose of training. The aim of this study was two-fold: (1) to investigate the locomotor demands imposed by LSGs and the official matches; and (2) to compare the effect of different pitch sizes’ LSG conditions in the locomotor demands. This study followed an observational design. Sixteen professional football players from the same team (26.3 ± 3.0 years old) were included. The study was conducted over four weeks. The same GK + 10 × 10 + GK play format with different pitch sizes (i.e., area per player ranging between 195 m2 to 291 m2 ) was analyzed. Three official matches were also collected in which the 10 most de manding minutes were considered for further comparisons. Only the same players who participated in matches were considered in comparison with the LSG. The data were obtained using a 10-Hz global positioning system technology. Total distance (TD) and mechanical work (MW) scores increased 20% and 23%, respectively, between the smallest and biggest pitch sizes (p < 0.001). There was a significant difference in locomotor intensity metrics between opponents from different positions on the table (p = 0.001). The biggest LSG (i.e., 291 m2 per player) was the only one that required similar levels of locomotor intensity as required in the official full match. The present study demonstrates that LSG pitch size variation requires different locomotor intensities. Bigger pitch sizes cause an increase in TD and MW. In addition, considering the position on the table, the level of opponents induces different TD covered. Finally, the largest LSG simulates the official match more accurately.
- Physical Fitness and Body Composition of Youth Referees in Invasion GamesPublication . Gouveia, Élvio Rúbio; Lopes, Hélder; Nascimento, Marcelo de Maio; Clemente, Filipe Manuel; Sarmento, Hugo; Ihle, Andreas; Ferrari, Gerson; Luz, Pedro; Caldeira, Henrique; Marques, AdilsonBackground: Referees’ activity can be an instrument for training students with an impact on health-related physical fitness (PF). This study aimed to investigate the differences in PF and body composition between students without sports practice (G1), students with regular sports practice (G2), and student referees in team invasion games (G3). Methods: This study followed a cross-sectional design. The sample comprised 45 male students between 14 and 20 years old (16.40 ± 1.85). Three groups (G1, G2, and G3) of 15 participants each were selected. PF was assessed by a 20 m shuttle run, change-of-direction test, and standing long jump. Body composition was determined by body mass index (BMI; kg/m2 ) and the percentage of body fat (%BF) predicted by skinfold. Results: After controlling for age as a covariate, the block of variables used to characterize PF was statistically different between sports practice groups favoring student referees (p < 0.001; r = 0.26). Similar results were achieved for body composition (i.e., BMI and %BF) (p < 0.001; r = 0.17). However, when the dependent variables were evaluated separately, there were only differences between groups in %BF (p = 0.007; r = 0.21). Student referees had statistically significantly lower values than the remaining groups. Conclusion: Refereeing activity benefits PF related to health and performance, including body composition. This study confirms the benefits related to health in children and adolescents who are involved in refereeing activity