Browsing by Author "Mendes, Rui"
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- Uma abordagem multidisciplinar para o ensino de técnicos em jogo desportivos coletivosPublication . Manuel Clemente, Filipe; M. L. Martins, Fernando; Mendes, Rui
- Accuracy of pattern detection methods in the performance of golf puttingPublication . Couceiro, Micael; Dias, Gonçalo; Mendes, Rui; Araújo, DuarteThe authors present a comparison of the classification accuracy of 5 pattern detection methods in the performance of golf putting. The detection of the position of the golf club was performed using a computer vision technique followed by the estimation algorithm Darwinian particle swarm optimization to obtain a kinematical model of each trial. The estimated parameters of the models were subsequently used as sample of five classification algorithms: (a) linear discriminant analysis, (b) quadratic discriminant analysis, (c) naive Bayes with normal distribution, (d) naive Bayes with kernel smoothing density estimate, and (e) least squares support vector machines. Beyond testing the performance of each classification method, it was also possible to identify a putting signature that characterized each golf player. It may be concluded that these methods can be applied to the study of coordination and motor control on the putting performance, allowing for the analysis of the intra- and interpersonal variability of motor behavior in performance contexts.
- Activity profiles of soccer players during the 2010 World CupPublication . Clemente, Filipe Manuel; Couceiro, Micael; M. L. Martins, Fernando; Ivanova, Monika Ognyanova; Mendes, RuiThe main objective of this study was to analyse the distance covered and the activity profile that players presented at the FIFA World Cup in 2010. Complementarily, the distance covered by each team within the same competition was analysed. For the purposes of this study 443 players were analysed, of which 35 were goalkeepers, 84 were external defenders, 77 were central defenders, 182 were midfielders, and 65 were forwards. Afterwards, a thorough analysis was performed on 16 teams that reached the group stage, 8 teams that achieved the round of 16, 4 teams that reached the quarter-finals, and 4 teams that qualified for the semi-finals and finals. A comparison of the mean distance covered per minute among the playing positions showed statistically significant differences (F(4,438) = 559.283; p ˂ 0.001; 2 = 0.836; Power = 1.00). A comparison of the activity time among tactical positions also resulted in statistically significant differences, specifically, low activity (F(4,183.371) = 1476.844; p ˂ 0.001; 2 = 0.742; Power = 1.00), medium activity (F(4,183.370) = 1408.106; p ˂ 0.001; 2 = 0.731; Power = 1.00), and high activity (F(4,182.861) = 1152.508; p ˂ 0.001; 2 = 0.703; Power = 1.00). Comparing the mean distance covered by teams, differences that are not statistically significant were observed (F(3,9.651) = 4.337; p ˂ 0.035; 2 = 0.206; Power = 0.541). In conclusion, the tactical positions of the players and their specific tasks influence the activity profile and physical demands during a match.
- Acute effects of different formats of small-sided and conditioned handball games on heart rate responses in female students during PE classesPublication . Manuel Clemente, Filipe; Rocha, Rúben Filipe; M. L. Martins, Fernando; Mendes, RuiThe aim of this study was to analyze the impact of different formats (2-a-side, 3- a-side and 4-a-side) on heart rate responses of female students during small-sided and conditioned handball games. The heart rate responses were measured using heart rate monitors during physical education classes. Eight female students participated in the study (15 ± 0.0 years). The one-way ANOVA showed statistical differences with moderate effect between the three different formats (F(2, 1674) = 86.538; p-value ˂ 0.001; ! = 0.094; Power = 1.0). The results showed that smaller formats (2-a-side and 3-a-side) increased the heart rate responses of female students during small-sided and conditioned handball games during physical education (PE) classes. The results also suggested that 2-a-side games can be used for anaerobic workouts and the 3-a-side and 4-a-side games can be better used to reach lactate-threshold and for aerobic workouts of high intensity
- Acute effects of the number of players and scoring method on physiological, physical, and technical performance in small-sided soccer gamesPublication . Manuel Clemente, Filipe; Wong, Del P.; M. L. Martins, Fernando; Mendes, RuiThis study aims to examine the effect of differences in the number of players and scoring method on heart rate responses, time–motion characteristics, and technical/tactical performance during small-sided soccer games. Ten male amateur soccer players (26.4 ± 5.3 years old, 8.4 ± 3.2 years of practice, 179.3 ± 5.2 cm body height, 71.2 ± 7.1 kg body weight, 45.8 ± 2.6 ml.kg–1min–1VO2max) from the Portuguese regional league played nine different small-sided games (i.e., 3 formats × 3 scoring methods). The study used two-way MANOVA, two-away ANOVA, and one-way ANOVA, depending on the specific procedure for the analysis. Compared with other formats, 2v2 induced significantly greater values of technical/tactical indexes (p = 0.001), 3v3 induced significantly higher %HRreserve values (p = 0.001), and 4v4 led to significantly greater distance coverage and speed (p = 0.001). The study provided evidence for coaches to set different small-sided game conditions depending on the training purpose in terms of physiological, physical, and technical performance.
- Alimentação, estilos de vida, prática desportiva, composição corporal e competência motora em crianças do ensino Pré-escolar e 1.º CEB (FORMIGA - Montemor-o-Velho)Publication . Campos, Francisco; Melo, Ricardo; M. L. Martins, Fernando; Damásio, António Sérgio; Mendes, Rui; Gomes, Ricardo
- An online tactical metrics applied to football gamePublication . Manuel Clemente, Filipe; Couceiro, Micael; M. L. Martins, Fernando; Mendes, RuiIn collective sports, the match analysis is fundamental in order to improve the quality of coaches’ intervention. Nevertheless, the generality of the systems are based on notational analysis which does not allow a deep understanding about the collective behaviour of the team. Therefore, the main goal of this study is to update and design new tactical metrics that allows an improved online knowledge about the teams’ behaviour. Tactical metrics such as the teams’ centroid, teams’ stretch index and teams’ effective play area will be presented throughout this study, validated by means of a single match experimental case study. Results suggest the potential of the herein proposed tactical metrics, providing relevant and online information to the coaches over time, thus allowing new opportunities to improve the quality of their intervention.
- Análise de jogo no futebol : métricas de avaliação do comportamento coletivoPublication . Manuel Clemente, Filipe; Couceiro, Micael; M. L. Martins, Fernando; Figueiredo, António J.; Mendes, RuiO jogo de futebol, como realidade complexa, necessita de uma interpretação do comportamento coletivo da equipa. Assim, o presente trabalho objetivou apresentar 4 métricas de avaliação coletiva baseadas na relação espácio-temporal, procurando identificar diferenças nos comportamentos coletivos nos momentos com e sem posse de bola. Para o efeito, analisou-se um jogo de futebol de sete do escalão de formação sub-14. Os resultados evidenciaram diferenças significativas entre os momentos com e sem posse de bola no que se refere ao espaço ocupado pelas equipas A (F(1, 1506)= 8.31, p= 0.004, η²= 0.005, Power= 0.82) e B (F(1, 1506)= 37.66, p= 0.001, η²= 0.024, Power= 1.00), às triangulações efetivas entre jogadores nas equipas A (F(1, 1506)= 1343.89, p= 0.001, η²= 0.472, Power= 1.000) e B (F(1, 1506)= 968.50, p= 0.001, η²= 0.391; Power= 1.00) e à progressão do centroid nas equipas A (F(1. 1506)= 11.79, p= 0.001, η²= 0.008, Power= 0.93) e B (F(1, 1506)= 9.43, p= 0.001, η²= 0.006, Power= 0.87). Conclui-se com o presente trabalho que as métricas de avaliação coletiva possibilitam uma identificação de relações espácio-temporais entre jogadores, identificando uma expansão maior das equipas na situação com posse de bola, bem como, o avanço do ponto médio da equipa.
- Análise do rendimento no primeiro serviço em tenistas de competição sob o efeito de um escoamento aerodinâmico induzidoPublication . Cabral Mendes, Pedro; Mendes, Rui; M. L. Martins, Fernando; Vicente, M. A. Facas; García, Juan Pedro Fuentes; Menayo, Ruperto; Dias, GonçaloO presente estudo analisou as variáveis de produto no serviço de tênis em 12 jogadores experientes, quando constrangidos com um escoamento aerodinâmico induzido (EAI) produzido por um ventilador industrial. Para o cálculo da exatidão do serviço, recorreu-se a uma análise 2D. A velocidade de saída da bola foi medida através de um radar. Os jogadores realizaram 100 serviços à máxima velocidade e para o ponto de interseção da linha central e linha de serviço. Os resultados não evidenciam diferenças estatisticamente signifi cativas na exatidão e precisão entre a condição de controlo e as quatro condições com EAI. Na variável velocidade de serviço verificaram-se diferenças significativas em seis participantes. Na relação entre a velocidade e a exatidão constatou-se a existência de correlações negativas e estatisticamente significativas, nas condições EAI1; EAI3 e EAI aleatório. Os jogadores apresentaram uma menor exatidão e precisão em profundidade e maior na direção do serviço.
- Analysis of scored and conceded goals by a football team throughout a season : a network analysisPublication . Santos, Agostinho; M. L. Martins, Fernando; Mendes, RuiNetwork analysis can provide a new set of important information about players and teams’ behaviour throughout a match. Despite their pertinence, football analysis using network metrics is limited. Therefore, the aim of this study was to analyse the goals scored and goals conceded by a single team during a full season using network methods. Thirty-six games were analysed and from these the data about players’ connectivity in actions preceding 46 goals scored and 15 goals conceded were collected. The results showed that the most used players during the plays that resulted in the goals scored were forward players in the forward regions, mainly in the penalty area. The lateral defenders and midfield players were the players that mostly initiated the attacking plays that resulted in the goals scored. In sum, it was possible to conclude that network metrics can provide a new visualization and understanding of team-members’ behaviour, as well as characterize some patterns of play giving sport’s analysts information complementary to the traditional notational analysis.