591 research outputs found
Leg dominance and performance in change of directions tests in young soccer players
The present study aimed to examine the influence of leg dominance on the change of direction (COD)
performance. In this study participated 94 healthy young highly trained male soccer players belonging
from two categories (n = 27 vs. n = 67; 14.81 ± 0.40 vs. 16.64 ± 1.25 years of age; 170.61 ± 5.61 vs.
173.73 ± 7.19 cm of height; 64.74 ± 8.44 vs. 66.70 ± 7.95 kg of weight, for U16 and U18, respectively).
Fitness assessments were performed two times in a period of three months, and included: (1)
anthropometry measures, (2) 30–15 IFT, (3) 10-m sprint test, (4) 505-COD test, 90° COD test and
cross-over hop test. A paired sample t-test was performed to evaluate the asymmetries at the
intragroup level in each of the COD’s tests. A symmetry index was used to analyse the asymmetries
between categories, and an independent sample t-test was used to compare the variability between
the two categories in each of the three tests performed. The effect size was also evaluated. Analysis
demonstrated that evidence a trend for a better performance with the preferred leg in the cross-over
hop and 505-COD tests, and with the non-dominant leg in the 90° COD. However, in the intragroup
analysis, only the 505-COD test registered differences, and no differences were notice din the
intergroup comparison. Only in the 505-COD test the percentage of variability (CV) was statistically
significant (7.03 ± 4.18% vs. 4.03 ± 2.02% from U16 and U18, respectively). In sum, bilateral differences
were noticed in the intragroup comparison, although only in 505-COD test the leg dominance
showed to influence performance. In the intergroup analysis any difference was noticed between age
categories
Who are the prominent players in the UEFA champions league? : an approach based on network analysis
This study aimed to analyze the centrality levels of elite football players. Tactical positions and
tactical line-ups were considered factors to be used in analyzing the variance in the prominence of
players, measured by social network measures. The best 16 teams from the UEFA Champions league
were analyzed during the entire competition. A total of 109 matches were analyzed for this study.
Significant statistical differences between positions were found in % indegree (p = 0.001; ES = 0.268,
moderate effect), % outdegree (p = 0.001; ES = 0.301, moderate effect) and % betweenness (p = 0.001;
ES = 0.114, minimum effect). No statistical differences between tactical line-ups in % outdegree (p =
1.000; ES = 0.001, no effect) or % indegree (p = 1.000; ES = 0.001, no effect) were found. Central
midfielders had the greatest values of centrality, thus confirming their importance in the linkage process
of the team. Position had great influence on the centrality levels of players.info:eu-repo/semantics/publishedVersio
PrincÃpios Pedagógicos dos Teaching Games for Understanding e da Pedagogia Não-Linear no Ensino da Educação FÃsica
The ecological teaching models of Physical Education distinguished by their student-centered teaching. Specifically, the Teaching Games for Understanding and the Nonlinear Pedagogy are models that allow a learning process based on the intrinsic dynamics of sports games, distinguished for their relevance to the development of students' declarative and procedural tactical knowledge. However, as recent models, need to be properly understood and geared towards to the efficient didactic intervention. Therefore, the main objective of this paper is to develop the pedagogical principles that underlie the models: i) sampling; ii) representation; iii) exaggeration; and iv) tactical complexity. In summary, will described the essential pedagogical principles that should underpin the teaching intervention of physical education teacher at the time of applied the teaching ecological models.Los modelos ecológicos de la enseñanza en educación fÃsica se distinguen por su relevancia para la enseñanza centrada en el estudiante. En concreto, la Enseñanza de Juegos para la Comprensión y la pedagogÃa no lineal, son modelos que permiten un proceso de aprendizaje basado en la dinámica intrÃnseca de los juegos deportivos, especialmente por su relevancia para el desarrollo de conocimientos tácticos declarativo y procedimental de los estudiantes. Sin embargo, los modelos más recientes deben ser bien entendidos y dirigidos para dar lugar a efectos beneficiosos sobre el aprendizaje de los estudiantes. En consecuencia, este artÃculo tiene por objeto desarrollar los principios pedagógicos que subyacen en los modelos: i) seleccionar el tipo de juego; ii) la modificación del juego por representación; iii) la modificación por exageración; y iv) el ajuste de la complejidad táctica. En definitiva, se trata de definir los principios básicos que deben sustentar la intervención de la enseñanza de profesor de educación fÃsica en el momento de desarrollo de los modelos ecológicos de enseñanza.  Os modelos de ensino ecológicos na Educação FÃsica distingue-se pela sua pertinência no sentido de centrar o ensino no aluno. Especificamente, os Teaching Games for Understanding e a Pedagogia Não-Linear são modelos que possibilitam um processo pedagógico baseado na dinâmica intrÃnseca dos jogos desportivos, destacando-se pela sua pertinência para o desenvolvimento do conhecimento tático declarativo e processual dos alunos. No entanto, como modelos recentes necessitam de ser devidamente compreendidos e orientados no sentido de resultaram proficuamente na intervenção didática. Nesse sentido o presente artigo procura desenvolver os princÃpios pedagógicos que baseiam os modelos: i) a seleção do tipo de jogo; ii) a modificação do jogo por representação; iii) a modificação por exagero; e iv) o ajustamento da complexidade tática. Em suma, procurar-se-á definir os princÃpios basilares que deverão sustentar a intervenção didática do professor de Educação FÃsica, aquando dos modelos ecológicos de ensino
Utilização dos jogos reduzidos no ensino do handebol: a influência das ações táticas
O presente estudo objetivou analisar a influência de dois espaços diferenciados de prática na consecução de ações táticas de alunos durante a exercitação de formas de jogo reduzidas de handebol. Participaram no estudo oito alunos do género masculino (18,25 ± 1,04 anos de idade). Os resultados evidenciam diferenças estatisticamente significativas no que se refere aos indicadores de número de ataques (t(4) = 4,811; p-value = 0,009) e número de ataques organizados (t(4) = 6,364; p-value = 0,003). Através do presente estudo foi possÃvel comprovar a pertinência da manipulação de constrangimentos da tarefa relacionados com o espaço, influenciando a concretização de ações táticas desempenhadas pelos alunos
Identifying the centrality levels of futsal players : a network approach
The aim of this study it was verify the differences of prominence levels between tactical positions in
futsal (indoor football). For that reason, it was performed an analysis of variance between competitive levels and
tactical positions for the centrality metrics computed by using network analysis. Forty-six futsal players from
different competitive levels (U12, U14, U16 and Amateurs) it were analysed during three official futsal matches.
Results revealed no differences in centrality metrics between competitive levels (p = 1.00; = 0.001; very small
effect size) had no significant statistical differences in the centrality metrics. Nevertheless, tactical position (p =
0.001; = 0.593; moderate effect size) had significant main effects on the centrality metrics. Centrality metrics
revealed that defenders are the most prominent players in to receive the ball. By the other hand, defenders and
wings are the positions with greater centralities in to pass the ball for the teammates.info:eu-repo/semantics/publishedVersio
Study of the heart rate and accuracy performance of archers
On archery performance, heart rate variability is associated to higher parasympathetic activity and a better
balance of parasympathetic and sympathetic are beneficial to performance within the sport (Lo, Huang & Hung,
2008). The purpose of this study was to compare heart rate and archery accuracy in experienced and
inexperienced archers as to determine if experience contributes to increased accuracy and decreased heart rate.
Eighteen male individuals (23.2 ± 5.3 years) participated. The task consisted in the realization of archery, aiming
to achieve higher scores corresponding to greater accuracy in target. Twelve trials were performed at two blocks
(i.e., total of twenty-four trials) by each participant. At each archery attempt, we collected the heart rate
immediately before the trial and the respectively accuracy of archery performance. The t-independent test
showed significant statistical differences on heart rate (t(430) = - 4.135, p-value = 0.001) and score of archery
performance (t(430) = 2.745, p-value = 0.006), between experienced and inexperienced archers. Experienced
archers exhibit a better accuracy and at same time a less heart rate comparing to inexperienced archers. It is
possible that the experience of the archers help to improve the arousal control and, consequently, balance
between sympathetic and parasympathetic systems.info:eu-repo/semantics/publishedVersio
Soccer teams behaviors : analysis if the team distribution in function to ball possession
Innovative tools to soccer analysis are the main concern of the sport performance analysts. Considering
team players occupation as one of the fundamental characteristics of soccer success, is too important generate new
systems to interpret the post-match reality. These systems must be easy for the coach's applications. Thus, this study
proposes an easy tool to understand the team’s collective behaviour in function to their ball possession status.
Through the histograms of all team players will be possible understand the most occupied areas by each team, trying
understand possible tendencies in the moments with and without ball possession. Were analyzed two teams during
an official soccer match, collecting their positions at each instant. Using this tracking was possible perform two heat
maps by each team, representing the moments with and without ball possession. Through this method was possible
analyze different collective behaviors and explain how could coaches interpret outcomes.info:eu-repo/semantics/publishedVersio
How team sports behave as a team? : general network metrics applied to sports analysis
The aim of this study was to analyse the general properties of networks in different team sports. Therefore, the analysis of variance to the general network properties between different team sports and different competitive levels was carried out. Sixty-six official matches (from Handball, Basketball, Football, Futsal, Rink-Hockey and Volleyball) were observed in five possible competitive levels (U12, U14, U16, U18 and Amateurs with more than 20 years). Analysis of variance revealed that the type of sport (p = 0.001; ��=0.647; moderate effect size) and competitive level(p = 0.001; �� = 0.355; small effect size)had significant statistical differences in the general network metrics. It was also found that football generates more connections between teammates but basketball and volleyball promote better results of density and clustering coefficient.info:eu-repo/semantics/publishedVersio
Towards a new method to analyze the soccer teams tactical behaviour : measuring the effective area of play
Recently, new tactical metrics have been developed to increase the match analysis’ potential. Naturally, innovate metrics need some
updates in order to improve the utility to the soccer coaches. Thus, this paper aims to update the surface area metric, proposing the effective area of play given some efficacy information’s about team players’ positioning. Furthermore, aim analyzes the effective area of play
of each team depending on the state of ball possession and a full match of 7-a-side soccer game in the district final was also analysed.
Results showed an inverse correlation between teams’ opposite effective areas of play(rp
= -0.681), suggesting the expansion-contraction
relationship. Furthermore, was analyzed statistical differences with large effect between the moments with and without ball possession
for the team A (F(1; 1506) = 1343.893; p-value ≤ 0.001; η2
= 0.472; Power = 1.000) and B (F(1; 1506) = 968.500; p-value ≤ 0.001; η2
= 0.391;
Power = 1.000).info:eu-repo/semantics/publishedVersio
Development of sports network analysis : methodological considerations
The understanding of dynamic and complex systems requires a multi-directional approach toward the
whole system. New mathematical approaches have been proposing new tools and techniques to understand the
collective dynamics in team sports. Nevertheless, to ensure the quality of the techniques it should be considered
the data collecting procedures. For that reason, the aim of this article is to suggest a set of methodological
considerations to optimize the match analysis based on network.info:eu-repo/semantics/publishedVersio
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