José Gama

Network analysis and intra-team activity in attacking phases of professional football

In this study we sought to verify whether network analyses could be used to identify key players in attacking phases of a professional football match and establish the main interactions and preferential linkages between attacking teammates during competitive performance. For this purpose, we examined circulation of the ball on field during randomly selected attacking phases of play in a video-taped Portuguese Premier League match. We observed six matches and notated 1488 collective attacking actions, including: passes completed, passes received, and crosses involving a total of 4126 intra-team interactions (eg., 2063 passes and crosses performed and 2063 passes and crosses received). We used Amisco® software to perform quantitative and qualitative analyses of the attacking actions. Results indicated how key individual players are instrumental in orchestrating team performance, exerting a powerful influence in creating attacking patterns of play. Our findings may help coaches and sports scientists quantify the contributions and interactions of individual team members through analysis of their relevant actions in team sports like football.

Potential use of pyrite as an amendment for calcareous soil

Abstract The results of an ongoing study of soil improvement using pyrite-rich waste from the Neves-Corvo copper mine as an amendment, are reported for an area in southern Portugal. The application of pyrite to the calcareous soils resulted in the increased availability of certain trace elements, an increase in nutritive parameters, and an increase in dry matter production. This application does not appear to lead to pollution problems in surface waters or toxicological problems in grazing animals.

Perception of Creativity and Game Intelligence in Soccer

A questionnaire was used to investigate the perception of creativity and game intelligence of coaches (n = 34, mean age 28.6 with an average of 14.3 years of experience) and players (n = 118, belonging to the ranks U-15 and U-19). Analyses indicated that there were statistically significant differences in most creative concepts inherent in the perception of creativity on the part of coaches. The results for the perception of the players showed that there were statistically significant differences in the importance attached to creativity and game intelligence. Apparently coaches mostly associate the creativity in soccer to a kind of magical thinking, adding also the game intelligence to the ability of rationality, problem solving, and decision. There was a strong correlation between creativity and game intelligence for the players.

An ecological dynamics rationale to explain home advantage in professional football

Despite clear findings, research on home advantage in team sports lacks a comprehensive theoretical rationale for understanding why this phenomenon is so compelling. The aim of this study was to provide an explanatory theoretical rationale in ecological dynamics for the influence of home advantage observed in research on professional football. We recorded 30 competitive matches and analyzed 13958 passes, from one highly successful team in the Portuguese Premier League, during season 2010/2011. Performance data were analyzed using the Match Analysis Software—Amisco® (version 3.3.7.25), allowing us to characterize team activity profiles. Results were interpreted from an ecological dynamics perspective, explaining how task and environmental constraints of a competitive football setting required performers to continuously co-adapt to teammate behaviors. Despite slight differences in percentage of ball possession when playing home or away, the number of passes achieved by the team, while in possession of the ball, was quite different between home or away venues. When playing at home, the number of passes performed by the team was considerably higher than when playing away. The explanation proposed in this study for a home advantage effect can be understood from studying interpersonal coordination tendencies of team sports players as agents in a complex adaptive system.