Julio Garganta
Universidade do Porto, Faculdade de Desporto, Faculty Member
Abstract This study aims to analyse the effect of different pitch surface, i.e. artificial turf (AT), natural turf (NT) and dirt field (DF) on running activity and technical demands of young soccer players (age:13.4 ± 0.5yrs; height:... more
Abstract This study aims to analyse the effect of different pitch surface, i.e. artificial turf (AT), natural turf (NT) and dirt field (DF) on running activity and technical demands of young soccer players (age:13.4 ± 0.5yrs; height: 161.82 ± 7.52cm; body mass; 50.79 ± 7.22kg; and playing experience: 3.5 ± 1.4 yrs). Running activity data were collected using GPS units which allowed the calculation time–motion variables. Technical performance data were registered filming soccer matches. Analysis of variance (ANOVA) with repeated measures was employed to assess differences among variables. Total distance covered; distance for low-intensity running and very high-intensity running were higher on AT than NT (TD: η2 = .09, p = .007); (LIR: η2 = .062, p ≤ .05); and (VHIR: η2 = .05, p ≤ .05), respectively. Significant differences were identified between pitch surfaces on successful passing (η2 = .052, p = .051); unsuccessful passing (η2 = .155, p < .001); and interceptions (η2 = .1087, p < .001). Results suggest that pitch surface influences running activity and technical actions of young players. This information contributes to understand the different demands imposed in each pitch surface and, provides to the coaches the opportunity to implement strategies that could optimise players’ performance.
Research Interests:
Goal scoring has been regarded as the ultimate indicator of offensive success in soccer. Research on patterns that characterize goal-scoring possessions have frequently employed reductionist approaches. This paper aimed to examine the... more
Goal scoring has been regarded as the ultimate indicator of offensive success in soccer. Research on patterns that characterize goal-scoring possessions have frequently employed reductionist approaches. This paper aimed to examine the patterns of numerical relations of open-play goal-scoring possessions of the 2014 FIFA™ World Cup winner team. We hypothesized that a more unstable distribution of players in goal-scoring possessions Germany would be generated in sub-areas of the effective play-space closer to opponents’ goal. We analysed 11 video sequences from 6 matches of the German team in this tournament. The uncertainty of teams’ numerical advantage within sub-areas of play was calculated for each offensive sequence through Shannon’s entropy. We observed higher entropy within Germany’s Central Offensive (opponents’ Central Defensive) sub-area in comparison with the other sub-areas of play. There is a tendency of the German team to generate numerical instability within locations closer to the opponents’ goal, possibly due to the shifting of positions, drawing of opposing defenders towards peripheral areas and the creation of spaces for teammates to exploit within this risky zone to the opposition.
Research Interests: Sociology, Soccer, German, Entropy, Football, and 4 moreTournament, Offensive Realism, Exploit, and Entropie
Research Interests:
Research Interests:
Research Interests: Psychology and Humanities
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
We aimed to describe and compare the general morphological, somatotype and training background characteristics of Iberian waterpolo players (22 Portuguese and 22 Spanish National Teams players) considering their playing positions. The... more
We aimed to describe and compare the general morphological, somatotype and training background characteristics of Iberian waterpolo players (22 Portuguese and 22 Spanish National Teams players) considering their playing positions. The International Working Group of Kinanthropometry guidelines was herein followed, and a somatochart was obtained through specific software (Somatotype, Calculation and Analysis. (c)2001 SWEAT technologies). Spanish players train more hours per week (22.8 ±9.5 vs.12.2 ±5.6), are taller (187.4 cm ±6.6 vs.180.3 cm ±5.1), heavier (89.2 kg ±11.6 vs.79.1 kg ±10.0), show higher arm span (195.7 cm ±8.5 vs.185.2 cm ±7.4) and muscle mass percentage (49.0% ± 1.8 vs.46.0% ±6.0), and tend to be more mesomorphic (5.19 ±1.27 vs.4.26 ±1.32) than the Portuguese players. Concerning field positions, Spanish center forward players train more hours per week than the Portuguese (20.2 ±9.1 vs.12.2 ±3.8) and show higher arm span (204.4 cm ±7.3 vs.184.0 cm ±6.5). Spanish goal ke...
Research Interests: Physics and Portuguese
Research Interests:
In soccer, it seems relevant to understand the relationship between the ball recovering and the subsequent success or failure of attacking play. However, few studies have considered the links between the type of ball recovery in different... more
In soccer, it seems relevant to understand the relationship between the ball recovering and the subsequent success or failure of attacking play. However, few studies have considered the links between the type of ball recovery in different pitch zones, the competition stages and the overall teams success. The present study aims to analyze the attacks ( n = 1619) carried out by the semi-finalist teams in the 2010 FIFA World Cup in order to explore ball recovery patterns as a performance indicator. SoccerEye observational instrument, SoccerEye recording software, Sequential Data Interchange Standard-Generalized Sequential Querier (SDIS-GSEQ) and SPSS analytic software—one-way analysis of variance, two-way analysis of variance and regressions—were applied. Direct ball recovery, in specific by interception and defensive behavior followed by a pass, was the mostly frequent behavior, with the later inducing attacking play efficacy ( p<0.017). Differences were detected between the group ...
Research Interests:
Shooting performance of globally ranked winning, drawing and losing water polo teams was compared, and technical and tactical success indicators were identified. In total, 886 shots from a world championship final round were videotaped... more
Shooting performance of globally ranked winning, drawing and losing water polo teams was compared, and technical and tactical success indicators were identified. In total, 886 shots from a world championship final round were videotaped and teams were clustered for a performance evaluation (considering differences between game outcomes). Shooting speeds were assessed by a radar, with higher values observed at further distances from the goal than in the central area close to the goal (p ≤ 0.00, ES: 2.54). Shots tended to be more frequent from the central corridor, with ≤50% and >75% relative shot efficacy attained from field areas 3 and 6; winning teams obtained better results. Furthermore, winners had greater success than losers when shooting from field area 2 (p ≤ 0.04, ES: 1.13) and towards the goal zone 2 (p < 0.03, ES: 1.10). They also attained better efficacy regarding shots towards goal zone 1, had better efficacy on the part of centre-forwards (p ≤ 0.05, ES: 0.85-1.27), ...
Research Interests:
Resumo O presente trabalho pretende analisar a abordagem de esporte coletivo proposta por Claude Bayer (O Ensino dos Desportos Colectivos, 1994), Oliveira & Graça (organizadores do livro O Ensino dos Jogos Desportivos, 1995) e Julio... more
Resumo O presente trabalho pretende analisar a abordagem de esporte coletivo proposta por Claude Bayer (O Ensino dos Desportos Colectivos, 1994), Oliveira & Graça (organizadores do livro O Ensino dos Jogos Desportivos, 1995) e Julio Garganta (Para uma Teoria dos Jogos Desportivos Colectivos, 1995), avançando na discussão da relevância, do lugar e do tempo do ensino dos gestos técnicos específicos de cada modalidade na citada proposta. Utilizando um conceito cultural de técnica corporal, a partir do qual deve ser considerado o significado de todo e qualquer movimento no seio de uma dada sociedade, pretende-se analisar o ensino dos gestos técnicos, não somente a partir da dimensão da eficiência, mas dentro de contextos culturais específicos, considerando-se também a eficácia simbólica. Para analisar o ensino dos esportes coletivos, este trabalho propõe uma estrutura pendular, que tem na sua base os princípios operacionais e na sua extremidade os gestos técnicos específicos de cada mod...
Water polo is a team sport that has been suffering rule changes aiming for a more attractive game. Our goal was to unveil whether different offensive playing styles or methods were adopted by elite national teams from Eastern Europe and... more
Water polo is a team sport that has been suffering rule changes aiming for a more attractive game. Our goal was to unveil whether different offensive playing styles or methods were adopted by elite national teams from Eastern Europe and from other world countries after the new rules framework was applied at the 2019 FINA World Championship. Additionally, we questioned whether those rules induced a more dynamic game. A total of 648 offensive sequences from games contested by the top-six ranked national squads were analysed. Descriptive statistics, parametric and nonparametric tests were computed, and the effect size was used. The eastern Europeans were the tallest (t (76) = −4.081; p < 0.001, d = 0.42) and the Hungarians were higher than Italians (p = 0.005, dz = −0.41). Offensive time length differed between teams (H (5) = 30.50, p < 0.001) with Serbia being the fastest (Mdn = 22 s). In successful attacks without extra time, Italy was quicker than Spain (17.5 vs. 25.0 s; p = 0...
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
This study analysed the influence of field dimension and players' skill level on collective tactical behaviours during small-sided and conditioned games (SSCGs). Positioning and displacement data were collected using global... more
This study analysed the influence of field dimension and players' skill level on collective tactical behaviours during small-sided and conditioned games (SSCGs). Positioning and displacement data were collected using global positioning systems (15 Hz) during SSCGs (Gk+4 v. 4+Gk) played by two groups of participants (NLP- national-level and RLP-regional-level players) on different field dimensions (small: 36.8 × 23.8 m; intermediate: 47.3 × 30.6 and large: 57.8 × 37.4 m). Team tactical performance was assessed through established dynamic team variables (effective playing space, playing length per width ratio and team separateness) and nonlinear signal processing techniques (sample entropy of distances to nearest opponents and the teams'…
Research Interests:
Título: Influencia de la longitud del campo en los comportamientos inter e intra -equipo en jóvenes jugadores de fútbol. Resumen: El comportamiento táctico puede verse afectado por los cambios en los formatos de juegos reducidos (SSG). El... more
Título: Influencia de la longitud del campo en los comportamientos inter e intra -equipo en jóvenes jugadores de fútbol. Resumen: El comportamiento táctico puede verse afectado por los cambios en los formatos de juegos reducidos (SSG). El objetivo del presente estudio fue analizar la influencia de diferentes longitudes del terreno de juego en formatos SSG-de-7 jugadores en jóvenes futbolistas. 14 jugadores masculinos de fútbol en cada grupo de edad (13 y 14 años, U13 y U14, respectivamente) se dividieron en dos equipos de siete jugadores, quienes jugaron en cuatro SSGs de 7 minutos de duración, intercalados con 4 minutos de recuperación pasiva. La única modificación en el formato SSG fue longitud del terreno: 60 m (SSG60), 50 m (SSG50), 40 m (SSG40) y 30 m (SSG30), mientras que la anchura del campo de 40 m se mantuvo constante. Las variables utilizadas para caracterizar el comportamiento colectivo se agruparon en: a) variables intra-equipo, es decir, la longitud del equipo (L), anch...
O objetivo do presente estudo foi analisar a produção científica referente aos aspectos tático-técnicos nos JEC publicada em periódicos brasileiros entre 2000 e 2015. Por meio da busca online em 14 revistas, foram selecionados 335... more
O objetivo do presente estudo foi analisar a produção científica referente aos aspectos tático-técnicos nos JEC publicada em periódicos brasileiros entre 2000 e 2015. Por meio da busca online em 14 revistas, foram selecionados 335 artigos. Os trabalhos foram classificados nas seguintes categorias temáticas: Análise do desempenho tático-técnico, Metodologias de ensino, Análise do desempenho energético-funcional, Formação de treinadores, Formação de atletas e Outros. A partir de 2009, verifica-se um aumento substancial no número de publicações. A maior frequência de publicações (60,9%) encontra-se entre as temáticas Análise do desempenho tático-técnico e Metodologias de ensino. Adicionalmente, das 16 modalidades esportivas exibidas nos artigos, o futebol e o futsal contemplam 50,7% das publicações. Conclui-se que a produção científica acerca dos aspectos tático-técnicos nos JEC ainda é pouco abrangente e plural, portanto, mais estudos são necessários, sobretudo na Formação de Treinado...
Research Interests: Psychology and Movimento
Acceso de usuarios registrados. Acceso de usuarios registrados Usuario Contraseña. ...
Research Interests:
Research Interests: Psychology and Movimento
Research Interests:
Várias tentativas têm sido feitas para descrever a estrutura do rendimento no Futebol. No entanto, apesar de alguns factores poderem já ser reunidos, os catálogos de prioridades e as estruturas hierárquicas estabelecidas pouco mais têm... more
Várias tentativas têm sido feitas para descrever a estrutura do rendimento no Futebol. No entanto, apesar de alguns factores poderem já ser reunidos, os catálogos de prioridades e as estruturas hierárquicas estabelecidas pouco mais têm conseguido do que reproduzir pequenas e desarticuladas fracções do jogo. Todavia, a realidade tem demonstrado que a pertinência do estudo dos problemas inerentes ao jogo e ao jogador deverá situar-se mais ao nível da interacção dos factores do que em cada um deles per se. Diversas conclusões decorrentes de vários estudos realizados, fazem emergir a necessidade de encontrar métodos que permitam reunir e organizar os conhecimentos, a partir do reconhecimento da complexidade do jogo de Futebol e das propriedades de interacção dinâmica das equipas implicadas, enquanto conjuntos ou totalidades. No presente artigo pretendemos evidenciar que a abordagem sistêmica do jogo de Futebol constitui uma importante referência a considerar nos processos de ensino e tr...
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Aquino, R, Carling, C, Palucci Vieira, LH, Martins, G, Jabor, G, Machado, J, Santiago, P, Garganta, J, and Puggina, E. Influence of situational variables, team formation, and playing position on match running performance and social... more
Aquino, R, Carling, C, Palucci Vieira, LH, Martins, G, Jabor, G, Machado, J, Santiago, P, Garganta, J, and Puggina, E. Influence of situational variables, team formation, and playing position on match running performance and social network analysis of brazilian professional soccer players. J Strength Cond Res XX(X): 000-000, 2018-The purpose of this study was to investigate the independent and interactive effects of situational variables, opposition team formation, and playing position on running performance and network analysis in Brazilian professional soccer players (n = 22). Global positioning system technology was used to determine total distance covered, mean speed, maximum running speed, and distance covered in 6 speed ranges. Social network analysis was used to assess interpersonal coordination (team interactions characterized as successful passes [n = 3,033] between teammates). Observations of match running performance (n = 129) and network analysis (n = 108) were obtained....
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Información del artículo Comparaçao da percepçao do treinador e dos jogadores, face à prestaçao táctica em futebol: estudo de caso numa equipa de juniores A.
... | Ayuda. Análisis del juego en el fútbol. Autores: Julio Garganta; Localización: Training fútbol: Revista técnica profesional, ISSN 1577-7480, Nº 64, 2001 , pags. 14-27. © 2001-2010 Universidad de La Rioja · Todos los derechos... more
... | Ayuda. Análisis del juego en el fútbol. Autores: Julio Garganta; Localización: Training fútbol: Revista técnica profesional, ISSN 1577-7480, Nº 64, 2001 , pags. 14-27. © 2001-2010 Universidad de La Rioja · Todos los derechos reservados. XHTML 1.0; UTF‑8.
Research Interests:
... | Ayuda. Para una teoría de los juegos deportivos colectivos. Autores: Julio Garganta; Localización: La enseñanza de los juegos deportivos / coord. por José Oliveira, Maria Da Graça PR Guedes, 1997, ISBN 84-8019-299-2 , pags. 9-24. ...
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Developing synchronised player movements for fluent competitive match play is a common goal for coaches of team games. An ecological dynamics approach advocates that intra-team synchronization is governed by locally created information,... more
Developing synchronised player movements for fluent competitive match play is a common goal for coaches of team games. An ecological dynamics approach advocates that intra-team synchronization is governed by locally created information, which specifies shared affordances responsible for synergy formation. To verify this claim we evaluated coordination tendencies in two newly-formed teams of recreational players during association football practice games, weekly, for fifteen weeks (thirteen matches). We investigated practice effects on two central features of synergies in sports teams - dimensional compression and reciprocal compensation here captured through near in-phase modes of coordination and time delays between coupled players during forward and backwards movements on field while attacking and defending. Results verified that synergies were formed and dissolved rapidly as a result of the dynamic creation of informational properties, perceived as shared affordances among perfor...
Research Interests:
Información del artículo Do modelo de jogo do treinador ao jogo praticado pola equipa: um estudo sobre o contra-ataque, em futebol de alto rendimento.
Research Interests:
Research Interests:
"Our purpose was to describe physical and training background characteristics of Water Polo players and compare them according to their specialized playing positions. The International Working Group of Kinanthropometry guidelines... more
"Our purpose was to describe physical and training background characteristics of Water Polo players and compare them according to their specialized playing positions. The International Working Group of Kinanthropometry guidelines were followed. A one-way unvaried measure ANOVA with Bonferroni post hoc was used to develop a multiple comparisons procedure between the specialized playing positions (α=0.05). It was concluded that the center players presented tendency for the highest values in 8 of the 10 parameters studied. Center backs are older than the drivers and center forwards have a higher BMI than the wingers and the goalkeepers. The somatotype is balanced mesomorph. Center forwards and Drivers tend to get closer endomorphy when compared with the remaining positions. KEY WORDS: Anthropometry, specialized playing position."
Research Interests:
O presente estudo teve como propósito central a criação e validação de um sistema de avaliação da assimetria funcional dos membros inferiores em situação de jogo de Futebol (SAFALL-FOOT). A avaliação dura vinte minutos e é realizada com... more
O presente estudo teve como propósito central a criação e validação de um sistema de avaliação da assimetria funcional dos membros inferiores em situação de jogo de Futebol (SAFALL-FOOT). A avaliação dura vinte minutos e é realizada com base na observação e registo dos comportamentos dos jogadores em situação de jogo de 5x5. Os resultados obtidos permitem classificar as ações técnicas realizadas por cada jogador, de acordo com 6 categorias e 32 subcategorias que constituem o SAFALL-FOOT, resultando no cálculo de um índice de utilização do pé preferido e do pé não preferido. A validade de conteúdo das categorias de observação foi estabelecida por um painel de peritos, o qual incluiu treinadores com elevada experiência, ex-jogadores profissionais e especialistas universitários das áreas do Futebol e da Aprendizagem Motora. A validade facial foi outorgada pela avaliação de jogadores e treinadores das equipas submetidas ao teste. A validade ecológica resultou do reconhecimento da congru...
Research Interests:
Research Interests:
The relative space per player formulated in small-sided and conditioned games can be manipulated either by promoting variations in player numbers or by modifying field dimensions. In this study we analysed how the same relative spaces per... more
The relative space per player formulated in small-sided and conditioned games can be manipulated either by promoting variations in player numbers or by modifying field dimensions. In this study we analysed how the same relative spaces per player, obtained through manipulations of player numbers and field dimensions, influenced inter-individual coordination. The positional data (GPS, 10 Hz) of 24 U-15 yrs performing in three different relative spaces per player (118, 133 and 152m2) was used. Inter-individual behavioural measures included: (i) effective relative space per player, (ii) radius of free movement; (iii) numerical relations inside each player's relative space per player; and (iv) players' spatial distribution variability. Magnitude-based inferences were used to analyse the practical significance of the selected variables. Results showed that manipulations of player numbers elicited more free space in the vicinity of each player. However, more advantageous numerical ...
Research Interests:
The throwing ability is identified as one of the most decisive actions in the game. The high level competitions are ideal moments to study the elite performance. The purpose of the present study was: (i) to find if there are differences... more
The throwing ability is identified as one of the most decisive actions in the game. The high level competitions are ideal moments to study the elite performance. The purpose of the present study was: (i) to find if there are differences of shooting speed between Australian national team and the finalists of the 2013 world championships; (ii) to find if there are differences regarding the percentage of occurrence of shooting type, provenance action before the shot, defensive blocking and men up play; (iii) to reveal the efficacy values and offensive productivity of the two groups. Throwing velocities (319 shots) of 11 water polo matches were assessed, in the last water polo world championships (Hungary, Montenegro and Australian national teams). The games were recorded for posterior observation and analysis. The official information of the tournament (Omega) was also used. Throwing velocities were assessed with radar[1] (StalkerPro, USA). Observation methodology was applied and condu...
Research Interests: Psychology and Efficacy
EVOLUTION OF ATTACKING PATTERNS IN ELITE-LEVEL SOCCER BETWEEN 1982 AND 2010: THE APPLICATION OF LAG SEQUENTIAL ANALYSIS KEY WORDS: Observational methodology, Sequential analysis, Elite soccer, Changes over time, Tactical determinants.... more
EVOLUTION OF ATTACKING PATTERNS IN ELITE-LEVEL SOCCER BETWEEN 1982 AND 2010: THE APPLICATION OF LAG SEQUENTIAL ANALYSIS KEY WORDS: Observational methodology, Sequential analysis, Elite soccer, Changes over time, Tactical determinants. ABSTRACT: Broadcast footage of UEFA European and FIFA World Cups were used to assess the evolution of attacking patterns of play between 1982 and 2010. SoccerEye observation and recording instruments were used to gather data from 45 matches, which yielded 6791 attacks and 73463 multievents. A lag sequential analysis was carried out using SDIS-GSEQ software, enabling us to study changes in the attacking dynamics that have resulted in goals over the last three decades. Goals were scored in the central zone of the offensive sector in one-to-one situations between the attacking player and goalkeeper. The attacking team also had more players in the centre of play than the opposing team when the goals were scored. Over time, offensive patterns resulting in a...
Research Interests:
Research Interests:
Research Interests:
In Association Football, the study of variability in players' movement trajectories during performance can provide insights on tactical behaviours. This study aimed to analyse the movement variability present in: i) the players'... more
In Association Football, the study of variability in players' movement trajectories during performance can provide insights on tactical behaviours. This study aimed to analyse the movement variability present in: i) the players' actions zones and ii), distances travelled over time, considered as a player's positional spatial reference. Additionally, we investigated whether the movement variability characteristics of players from different skill levels varied. Two groups of U-17 yrs players of different performance levels (national and regional) performed in three small-sided games with varying pitch dimensions (small, intermediate and large). Linear and non-linear analyses were used to capture the magnitude and structure of their movement variability. Results showed that increases in pitch size resulted in more restricted action zones and higher distance values from personal spatial positional references for both groups. National-level players were more sensitive to pitc...
Research Interests:
Research Interests:
Research Interests:
O presente trabalho teve por objetivo verificar de que modo os comportamentos táticos dos jogadores de Futebol variam perante a alteração das dimensões do campo de jogo. Para tal, foram avaliadas 1476 ações táticas desempenhadas por 12... more
O presente trabalho teve por objetivo verificar de que modo os comportamentos táticos dos jogadores de Futebol variam perante a alteração das dimensões do campo de jogo. Para tal, foram avaliadas 1476 ações táticas desempenhadas por 12 jogadores da categoria sub-15. O instrumento utilizado para a recolha e a análise dos dados foi o Teste "GR3-3GR", que permite avaliar as ações táticas desempenhadas por cada um dos jogadores participantes, com e sem bola, de acordo com 10 princípios táticos fundamentais do jogo de Futebol, tendo em conta a localização da ação no campo de jogo e o seu resultado final. A partir dessas informações o teste fornece 13 índices de performance tática do jogador. A análise estatística foi realizada com recurso ao SPSS for Windows, a partir da análise exploratória verificou-se a normalidade da distribuição, aplicando-se também o teste de Shapiro-Wilk, teste de qui-quadrado, teste de Mann-Whitney U (p < 0,05) e teste de fiabilidade. Os resultados m...
Os instrumentos disponíveis para a avaliação do conhecimento tático processual em Futebol têm resultado de uma abordagem vaga, no que respeita à especificidade do jogo. O presente artigo tem por objetivo fundamentar conceitualmente a... more
Os instrumentos disponíveis para a avaliação do conhecimento tático processual em Futebol têm resultado de uma abordagem vaga, no que respeita à especificidade do jogo. O presente artigo tem por objetivo fundamentar conceitualmente a construção de um modelo de avaliação dos comportamentos táticos de jogadores, com base em princípios táticos fundamentais do jogo. A proposta aqui detalhada busca evidenciar a essencialidade tática do jogo e estabelecer um vínculo entre a informação proveniente da avaliação do jogador e suas implicações na transformação positiva do processo de ensino e treino.
An extensive body of work has focused on the processes underpinning perceptual-cognitive expertise. The majority of researchers have used film-based simulations to capture superior performance. We combined eye movement recording and... more
An extensive body of work has focused on the processes underpinning perceptual-cognitive expertise. The majority of researchers have used film-based simulations to capture superior performance. We combined eye movement recording and verbal reports of thinking to explore the processes underpinning skilled performance in a complex, dynamic, and externally paced representative volleyball task involving in situ data collection. Altogether, 27 female volleyball players performed as centre backcourt defenders in simulated sessions while wearing an eye-tracking device. After each sequence, athletes were questioned concerning their perception of the situation. The visual search strategies employed by the highly-skilled players were more exploratory than those used by skilled players, involving more fixations to a greater number of locations. Highly-skilled participants spent more time fixating on functional spaces between two or more display areas, while the skilled participants fixated on ...
Research Interests:
Research Interests:
Research Interests:
Research Interests:
In Association Football, the study of variability in players’ movement trajectories during performance can provide insights on tactical behaviours. This study aimed to analyse the movement variability present in: i) the players’ actions... more
In Association Football, the study of variability in players’ movement trajectories during performance can provide insights on tactical behaviours. This study aimed to analyse the movement variability present in: i) the players’ actions zones and ii), distances travelled over time, considered as a player’s positional spatial reference. Additionally, we investigated whether the movement variability characteristics of players from different skill levels varied. Two groups of U-17 yrs players of different performance levels (national and regional) performed in three small-sided games with varying pitch dimensions (small, intermediate and large). Linear and non-linear analyses were used to capture the magnitude and structure of their movement variability. Results showed that increases in pitch size resulted in more restricted action zones and higher distance values from personal spatial positional references for both groups. National-level players were more sensitive to pitch modificati...
Research Interests:
This paper aims to compare the tactical performance of soccer players in three different playing surfaces (artificial grass, natural grass and gravel), as well as to check for differences between offensive and defensive tactical... more
This paper aims to compare the tactical performance of soccer players in three different playing surfaces (artificial grass, natural grass and gravel), as well as to check for differences between offensive and defensive tactical performance. The sample comprised 3,999 tactical actions performed by 84 U-13 players, being 1,136 actions on natural grass field, 2,183 on artificial grass field and 680 on gravel field. The instrument used for data collection and analysis was FUT-SAT, which assesses the tactical performance of players. In order to check for differences between variables, one-way ANOVA and Kruskal-Wallis were run. Tactical performance was not different between playing surfaces. However, in general, the defensive tactical performance proved to be poorer than the offensive one (p<0.001). Therefore, it is concluded that the playing surface had no influence on the tactical performance and players evidenced better offensive tactical performance rather than a defensive one.
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Later published in Silva P, Brito J, Garganta J, Mendes R. The effects of pitch size and skill level on exercise intensity during soccer small-sided games in high-school boys. Atención Primaria 2013;45(S2):90-1.
Research Interests:
Research Interests:
Revista da Educação Física/UEM, Vol. 21, No 3 (2010). ...
Research Interests:
Acceso de usuarios registrados. Acceso de usuarios registrados Usuario Contraseña. ...
Research Interests:
Base de dados : LILACS. Pesquisa : 203457 [Identificador único]. Referências encontradas : 1 [refinar]. Mostrando: 1 .. 1 no formato [Detalhado]. página 1 de 1, 1 / 1, LILACS, seleciona. para imprimir. Fotocópia. experimental, Documentos... more
Base de dados : LILACS. Pesquisa : 203457 [Identificador único]. Referências encontradas : 1 [refinar]. Mostrando: 1 .. 1 no formato [Detalhado]. página 1 de 1, 1 / 1, LILACS, seleciona. para imprimir. Fotocópia. experimental, Documentos relacionados. Id: 203457. ...
Research Interests:
Acceso de usuarios registrados. Acceso de usuarios registrados Usuario Contraseña. ...
Research Interests:
A soccer game can be seen as a confrontation between two teams of agents where each player, communicating with his teammates, try to interpret in the best way as possible the game situations, achieving its main goals. Today the most... more
A soccer game can be seen as a confrontation between two teams of agents where each player, communicating with his teammates, try to interpret in the best way as possible the game situations, achieving its main goals. Today the most important factors in a soccer clubs life and in its coach success are the game results they achieve. They represent the success of the club and in many cases the coachs future. Because of that club coaches usually use automated tools to measure their teams performance all over a soccer ...
Abstract: The role of ecological constraints on the acquisition of sport expertise is gaining attention in sport science, although more research is needed. In this position paper we provide an ecological explanation for expertise... more
Abstract: The role of ecological constraints on the acquisition of sport expertise is gaining attention in sport science, although more research is needed. In this position paper we provide an ecological explanation for expertise acquisition, as alluding to qualitative data that support the idea that unconventional, even aversive, environmental constraints may play an important role in the development of worldclass athletes. We exemplify this argument by profiling the role of unconventional practice environments using association ...
Research Interests:
This paper discusses how social network analyses and graph theory can be implemented in team sports performance analyses to evaluate individual (micro) and collective (macro) performance data, and how to use this information for designing... more
This paper discusses how social network analyses and graph theory can be implemented in team sports performance analyses to evaluate individual (micro) and collective (macro) performance data, and how to use this information for designing practice tasks. Moreover, we briefly outline possible limitations of social network studies and provide suggestions for future research. Instead of cataloguing discrete events or player actions, it has been argued that researchers need to consider the synergistic interpersonal processes emerging between teammates in competitive performance environments. Theoretical assumptions on team coordination prompted the emergence of innovative, theoretically driven methods for assessing collective team sport behaviours. Here, we contribute to this theoretical and practical debate by re-conceptualising sports teams as complex social networks. From this perspective, players are viewed as network nodes, connected through relevant information variables (e.g. a b...
Research Interests:
Research Interests:
This study analysed the influence of field dimension and players’ skill level on collective tactical behaviours during small-sided and conditioned games (SSCGs). Positioning and displacement data were collected using global positioning... more
This study analysed the influence of field dimension and players’ skill level on collective tactical behaviours during small-sided and conditioned games (SSCGs). Positioning and displacement data were collected using global positioning systems (15 Hz) during SSCGs (Gk+4 v. 4+Gk) played by two groups of participants (NLP- national-level and RLP-regional-level players) on different field dimensions (small: 36.8 × 23.8 m; intermediate: 47.3 × 30.6 and large: 57.8 × 37.4 m). Team tactical performance was assessed through established dynamic team variables (effective playing space, playing length per width ratio and team separateness) and nonlinear signal processing techniques (sample entropy of distances to nearest opponents and the teams’ centroids’ mutual information). Results showed that the effective playing space and team separateness increased significantly with pitch size regardless of participant skill level (P η 2 = 0.78 and P η 2 = 0.65, respectively). Playing length per width...
Research Interests:
Similar to other complex systems in nature (e.g., a hunting pack, flocks of birds), sports teams have been modeled as social neurobiological systems in which interpersonal coordination tendencies of agents underpin team swarming... more
Similar to other complex systems in nature (e.g., a hunting pack, flocks of birds), sports teams have been modeled as social neurobiological systems in which interpersonal coordination tendencies of agents underpin team swarming behaviors. Swarming is seen as the result of agent co-adaptation to ecological constraints of performance environments by collectively perceiving specific possibilities for action (affordances for self and shared affordances). A major principle of invasion team sports assumed to promote effective performance is to outnumber the opposition (creation of numerical overloads) during different performance phases (attack and defense) in spatial regions adjacent to the ball. Such performance principles are assimilated by system agents through manipulation of numerical relations between teams during training in order to create artificially asymmetrical performance contexts to simulate overloaded and underloaded situations. Here we evaluated effects of different nume...
Research Interests:
The purpose of the present study was to analyze the attacking tasks and tactical organization of elite Women’s Water Polo. The sample consisted of 442 attack sequences of 8 games played by the top teams in a European Championship.... more
The purpose of the present study was to analyze the attacking tasks and tactical organization of elite Women’s Water Polo. The sample consisted of 442 attack sequences of 8 games played by the top teams in a European Championship. Seventeen variables were analyzed according to the position and player’s participation, tactical organization and playing styles, as well as the efficacy of actions performed. The results from this study indicate that positional attack was the predominant performance factor in the attacking process. To this occurrence, the mixed floating defense was identified as the most frequent opposition. The counter-attack proved to be the most efficient strategy. The attacking process frequently started by ball recovering, in anticipation, and by the defense of the goal-keeper in the 2m zone. In central path, a first long-range pass to the right wing predominated. Teams preferred spontaneous shot on goal supported by assisted displacements, and extra player man offen...
Research Interests:
Research Interests:
Similar to other complex systems in nature (e.g., a hunting pack, flocks of birds), sports teams have been modeled as social neurobiological systems in which interpersonal coordination tendencies of agents underpin team swarming... more
Similar to other complex systems in nature (e.g., a hunting pack, flocks of birds), sports teams have been modeled as social neurobiological systems in which interpersonal coordination tendencies of agents underpin team swarming behaviors. Swarming is seen as the result of agent co-adaptation to ecological constraints of performance environments by collectively perceiving specific possibilities for action (affordances for self and shared affordances). A major principle of invasion team sports assumed to promote effective performance is to outnumber the opposition (creation of numerical overloads) during different performance phases (attack and defense) in spatial regions adjacent to the ball. Such performance principles are assimilated by system agents through manipulation of numerical relations between teams during training in order to create artificially asymmetrical performance contexts to simulate overloaded and underloaded situations. Here we evaluated effects of different nume...
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Abstract: The purpose of this paper was to report the development and preliminary validation of tactical assessment system in Soccer and highlight its advantages. The validation process followed five perspectives of the concept of... more
Abstract: The purpose of this paper was to report the development and preliminary validation of tactical assessment system in Soccer and highlight its advantages. The validation process followed five perspectives of the concept of validity that consider the value of heuristic ...
Research Interests:
Page 1. 57 Revista Portuguesa de Ciências do Desporto, 2001, vol. 1, nº 1, 5764 1. INTRODUÇÃO O estudo do jogo a partir da observação do comportamento dos jogadores e das equipas não é recente, tendo emergido a ...
ABSTRACT Dissertação de Doutoramento em Ciência do Desporto apresentada à Faculdade de Ciências do Desporto e de Educação Física da Universidade do Porto
Abstract. Nowadays soccer is more than a sport, it is a business industry. Providing financial support to a senior team is a constant challenge for club managers. Having this in mind the most relevant factors for a club's life are... more
Abstract. Nowadays soccer is more than a sport, it is a business industry. Providing financial support to a senior team is a constant challenge for club managers. Having this in mind the most relevant factors for a club's life are the game results. They can ensure, amongst other aspects, the continuity of a soccer coach. As a consequence of that, systems supporting decisions represent fundamental tools not only for match'analysis but also to support training sessions. In the literature most academic advances are camera-based solutions and still ...
Research Interests:
A soccer game can be seen as a confrontation between two teams of agents where each player, communicating with his teammates, try to interpret in the best way as possible the game situations, achieving its main goals. Today the most... more
A soccer game can be seen as a confrontation between two teams of agents where each player, communicating with his teammates, try to interpret in the best way as possible the game situations, achieving its main goals. Today the most important factors in a soccer clubs life and in its coach success are the game results they achieve. They represent the success of the club and in many cases the coachs future. Because of that club coaches usually use automated tools to measure their teams performance all over a soccer competition. Based only in Cartesian coordinates and in a sequential time frame analysis, this research work presents an automatic tool capable to calculate many technical aspects in a soccer match. For the validation tool process, games of simulation 2d RoboCup international competition were used. The results achieved were quite satisfactory. In what concerns to the set of statistics collected more than 92% of the total events were detected and only for the shot event this number dropped to between 74% and 85%. The future work will be concerned in incorporating this project with a real time tracking system and increasing the number of technical aspects calculated by the system.
Research Interests:
Research Interests:
Soccer is a team sport in which the performances of all team members are important for the outcome of a match. Even though the analysis of game events can be used to measure the team's performance, their perception, especially during the... more
Soccer is a team sport in which the performances of all team members are important for the outcome of a match. Even though the analysis of game events can be used to measure the team's performance, their perception, especially during the match, is extremely difficult, even for the involved agents. Soccer has been used as a simulation environment in many studies, mainly in the area of robotics. The RoboCup is an international robotics competition with an ambitious goal: in 2050 a robotics team will be capable of defeating the human world champion at the time. In this context, we compared technical similarities between human and robotics soccer. Based on an off-line automatic event detection tool, game statistics for the finals of both human and robotics soccer tournaments were collected and compared using the Wilcoxon test. The results show that the most frequent event in both forms of soccer is successful passes. Analysing the two types of passes considered (successful and missed), we conclude that there are significant differences between the two forms (W = 2, P=0.000354), with human soccer presenting a higher percentage of successful passes (77.89% vs. 66.97%). Of restart events (W=0, P=0.00048965), the most frequent one, in both forms, is the throw-in (human 59.91%, robotics 66.4%), and the least frequent is the corner (human 13.7%, robotics 14.09%). Regarding the frequency of shots, in the robotics environment “shots” were the most predominant type (43.27%), whereas in human soccer “shots on target” predominated (71.25%; W=64, P=0.000085641). Finally, the number of faults is minor in robotics soccer.
Research Interests:
In soccer, like in business, results are often the best indicator of a team’s performance in a certain competition but insufficient to a coach to asses his team performance. As a consequence, measurement tools play an important role in... more
In soccer, like in business, results are often the best indicator of a team’s performance in a certain competition but insufficient to a coach to asses his team performance. As a consequence, measurement tools play an important role in this particular field. In this research work, a performance tool for soccer, based only in Cartesian coordinates is presented. Capable of calculating final game statistics, suisber of shots, the calculus methodology analyzes the game in a sequential manner, starting with the identification of the kick event (the basis for detecting all events), which is related with a positive variation in the ball’s velocity vector. The achieved results were quite satisfactory, mainly due to the number of successfully detected events in the validation process (based on manual annotation). For the majority of the statistics, these values are above 92% and only in the case of shots do these values drop to numbers between 74 and 85%. In the future, this methodology could be improved, especially regarding the shot statistics, integrated with a real-time localization system, or expanded for other collective sports games, such as hockey or basketball.
Research Interests:
Research Interests:
Research Interests:
Research Interests:
In soccer games, a performance indicator is defined as a selection of action variables that aims to define all aspects of accomplishment of the game goals. However their perception during the match is extremely difficult. Over the years,... more
In soccer games, a performance indicator is defined as a selection of action variables that aims to define all aspects of accomplishment of the game goals. However their perception during the match is extremely difficult. Over the years, soccer has been used in many research areas including the robotic international soccer competition, RoboCup. The aim of this research project is to present a comparison study, performed to detect similarities between these two games (Human versus Robotic Simulation 2D soccer). Having an off-line automatic event detection tool as a base, a collection of final game statistics was done and the Mann-Whitney test was used to verify their statistical significance. The results show that the most frequent events occurred in both types of game are successful passes. In what concerns stopped game situation types, in both types of games, the most frequent one is the Throw in situation (Human-59,8%, versus Robotic-74,1%) and the less frequent is the Corner situation (Human-13,7%, versus Robotic-10,3%). Some differences still reside, especially in the frequency of set pieces and the action prior the goal.