Browsing by Author "Sousa, Duarte"
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- Analysis of the influence of the numerical relation in handball during an organized attack, specifically the tactical behavior of the center backPublication . Prudente, João Nunes; Cardoso, Américo Ramos; Rodrigues, Ana José; Sousa, Duarte Filipe; Prudente, João Filipe; Ramos Cardoso, Américo; Rodrigues, Ana; Sousa, DuarteIn the last decades, observational methodology has been widely used in scientific research in sport, namely in the study of team games like handball, due to its characteristics. Handball, in addition to being a collective, complex, dynamic, and interactive sport, has its own characteristics and demands a performance analysis that takes into account the context and interaction between different factors and variables. The present study analyzes how the different numerical relations in an attack can change the center back’s patterns of tactical behavior. Observational methodology and a mixed ad hoc instrument combining field format and category systems appropriately validated by experts were used. Data were taken from 20 matches involving teams classified in the first four places in the 2017 Men’s World Championship. These were recorded from TV broadcasts, and the total number of offensive sequences carried out in an organized attack game method (n = 990) was analyzed. In each of the sequences carried out in an organized attack, the numerical relation in attack or defense was observed and recorded. In addition to this, it was verified whether the attacking team maintained or replaced the goalkeeper by a field player in the attack. Both sequential analysis techniques with lags, prospective, and retrospective, as well as polar coordinate analysis, were used. Results have shown that there are different behavioral patterns of the center back in the three different situations of numerical relation. Another element that stood out was that in numerical equality with the defense and no goalkeeper at the goal, the center back opted for greater security and less risk of loss of the ball.
- Analyzing the influence of playing time and partial score on the tactical behavior in the duel 2 vs 2 in the offensive process in handball, using the polar coordinates techniquePublication . Prudente, João; Sousa, Duarte; Sequeira, Pedro; López-López, José Antonio; Hernández-Mendo, Antonio; Prudente, João Filipe; Sousa, Duarte<p><span style="font-size: medium;">Different studies have referred that the playing time and partial score, as well as the interaction between these two influences the behaviors of players and teams. With this study we intended to realize the complex reality of tactical behavior in the attack in Men´s European Cup, by detecting behavior patterns and linking them to playing time and partial score.</span></p><p><span style="font-size: medium;">We used the observational methodology and for data analysis we used the polar coordinates. An instrument of observation has been constructed <em>ad hoc</em> and validated. The tool optimization included the quality data control, using the analysis of intra and inter observer reliability by Cohen's Kappa index (range between .85 and 1), beyond the application of generalizability analysis (G indexes are suitable for all models estimated) confirming the instrument reliability. The sample contained all of 2<em>vs</em>2 situations that occurred during the organized offensive process in numerical equality 6<em>vs</em>6, in sixteen games (n = 390). </span></p><p><span style="font-size: medium;">As main results we can refer that the playing time influenced the decision-making in relation to the tactical means used, excepting the last ten minutes, where no patterns were found. The results also show that there are fewer behavior patterns when the score is a draw.</span></p>
- The athlete’s perception of parents behaviors in sport context: a study in youth handball players of the Madeira Handball AssociationPublication . Sousa, Duarte; Sousa, Duarte; Cardoso, Américo; Ramos Cardoso, Américo; Rodrigues, Ana; Rodrigues, Ana; Noite, João; Lopes, Helder; Fernando, Catarina; Fernando, Catarina; Prudente, João; Prudente, João FilipeThe participation of parents in their children's sports is very important. However, many parents end up having negative and deviant behaviours in sports and social context, generating this participation some controversy and misunderstandings. With this study, we intend to assess the perception of the athletes about the behaviour of the parents in the sport context, considering the demographic characteristics of the athletes (gender and age). The sample is composed by young handball players from the Madeira Handball Association, aged 9-16 years of both sexes (n=284, male n=122, female n=162) registered by ten clubs and with a minimum of one year of organized sports practice. For the collection of data, a questionnaire previously constructed and duly validated was used. The results confirm the perception of the role of parents in supporting their children 's sports practices, as well as motivating them for the sport. There is also a perception of the young players of a pressure exerted by the parents in obtaining immediate results and little appreciation of the progress of learning.
- Contributos para uma reflexão sobre o desporto escolarPublication . Prudente, João; Lopes, Helder; Fernando, Catarina; Sousa, DuarteA participação dos jovens no desporto, tanto a nível Regional como nacional, é baixa e tem levado alguns investigadores a interrogarem-se pelas razões que levam a esta realidade, tanto na escola como fora dela. Neste trabalho procuramos uma reflexão sobre a realidade escolar, tanto ao nível das oportunidades de participação desportiva oferecidas pela escola, como ao nível da qualidade da oferta, de modo a percebermos as barreiras que impedem uma significativa maioria de jovens de aderirem a uma participação efetiva ao Desporto na Escola.
- Fair play: the perception of the young handball players on the parent´s behaviorPublication . Sousa, Duarte; Cardoso, Américo; Ramos Cardoso, Américo; Rodrigues, Ana; Noite, João; Lopes, Helder; Lopes, Helder; Fernando, Catarina; Prudente, João; Prudente, João FilipeIn recent years, the deviant and negative behaviours of parents during follow-up in their children's sports practice have reached alarming proportions in various sports. This increase may be associated with greater participation of parents, both in the presence in games and in training. With this study, we intend to assess the perception of the athletes about the behaviour of the parents in the sports context, namely in relation to fair play. The sample consisted of young handball players from the Madeira Handball Association, aged 9- 16 years of both genders (n = 284, male n = 122, female n = 162) registered by ten clubs and with a minimum of one year of organized sports practice. For the data collection, a questionnaire previously constructed and duly validated was used. In this study were used descriptive statistics (mean and standard deviation), chi square and Spearman correlations. The statistical program used was SPSS v.25.0 and the level of significance was 5%.The results confirm that the athletes consider positive the presence of their parents, however, the results point to a perception of inadequate behaviours of the parents regarding the referees, mainly by the boys. It was found that the younger the athletes are the greater is the perception of the enthusiastic support of the parents, the greater the volume of instructions to the field, and the perception of a greater emotional discontent of the parents in relation to the problems and incidents of the game and training.
- Physical activity levels in adults with intellectual disabilities: the importance of physical educationPublication . Rodrigues, Ana José Aguiar; Rodrigues, Ana; Sousa, Duarte; Lopes, Helder; Lopes, Helder; Prudente, João; Prudente, João FilipeThe relationship between physical activity levels and health indicators is widely reported in the literature. However, the number of studies that characterize the physical activity profile in intellectually disabled adults is still small. The aims of this study are: (i) to determine the levels of physical activity in adults with intellectual disability, (ii) to study differences in physical activity levels between gender and between days with or without physical education. A total of 78 subjects (41 males and 37 females) with intellectual disability (mild and moderate), with a mean age of 30.18 ± 8.55 years, participated in the study. The physical activity levels were evaluated by pedometer (Yamax Digiwalkers SW-700), placed in two working days (one with Physical Education and another without Physical Education classes). There were reduced levels of physical activity in days with Physical Education (4865.21 ± 1611.04) and without (3739.22 ± 1243.34), clearly below the recommended values. Men were more active compared to women, but only on days with Physical Education (p <.05). In the days with Physical Education classes, there is a 24% increase in physical activity levels (27% in men and 20% in women). The performance of physical education classes seems to have benefic effects on physical activity levels, however, it is necessary to develop a study that helps to understand more deeply the factors that influence the levels of physical activity in this population.
- A review of velocity-type PSO variantsPublication . Sousa-Ferreira, Ivo; Sousa, DuarteThis paper presents a review of the particular variants of particle swarm optimization, based on the velocity-type class. The original particle swarm optimization algorithm was developed as an unconstrained optimization technique, which lacks a model that is able to handle constrained optimization problems. The particle swarm optimization and its inapplicability in constrained optimization problems are solved using the dynamic-objective constraint-handling method. The dynamic-objective constraint-handling method is originally developed for two variants of the basic particle swarm optimization, namely restricted velocity particle swarm optimization and self-adaptive velocity particle swarm optimization. Also on the subject velocity-type class, a review of three other variants is given, specifically: (1) vertical particle swarm optimization; (2) velocity limited particle swarm optimization; and (3) particle swarm optimization with scape velocity. These velocity-type particle swarm optimization variants all have in common a velocity parameter which determines the direction/movements of the particles.