Dispositivo de escoamento aerodinâmico induzido para análise do desempenho do serviço de ténis

Mendes, Pedro Cabral; Mendes, Rui; Silva, Manuel João Cerdeira Coelho e; Luz, J. Miguel A.; Dias, Gonçalo; Couceiro, Micael S.

doi:10.4025/reveducfis.v24i1.15784

Cited by 3 publications

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“…The speed of the engine was set up using an electronic speed variator (SEW Eurodrive 2 ) installed on the ventilator with an 11-positions potentiometer. In order to regulate the air flow, a steel mesh of 0.045 m was adapted to an air duct of 1.20 m length and 0.45 m diameter [7] which was connected to the ventilator's output.…”

Section: Induced Aerodynamic Flow Devicementioning

confidence: 99%

“…Our setup also considered the differences between players' heights and, as a consequence, the variations in the ball toss. As the ventilator was limited to a diameter of 0.45 m, a telescopic lift GUILE ELC -506 3 was used to adjust the height of the ventilator up to a maximum of 5.20 m. The calibration of the ventilator for each tennis player was made based on a preliminary study, which consisted on analyzing the average of the highest point of the ball in 20 serves and determining the average impact point [7].…”

Section: Induced Aerodynamic Flow Devicementioning

confidence: 99%

“…The space was calibrated using Matlab (version 2009R), in which a physical structure (parallelepiped) with a 2.50 × 2.50 m base and 3.20 m height was used as the reference system. In other words, the workspace was calibrated considering the eight vertices of the structure with a predefined relation between metric and virtual dimensions [7,20]. A script, which included the automatic loading of the captured images, was developed to calculate the position and real-world coordinates on each axis by manually clicking on the desired points.…”

Section: Analysis Devicementioning

confidence: 99%

“…This theoretical approach has been accepted by many researchers that have studied tennis movements, to bridge the gap between theoretical knowledge and the practice involved in training and during a match [6,7]. Girard et al [8] analyzed the kinematic of first tennis serve, while constraining the knee flexion angle, while Menayo et al [9] changed the type and size of the tennis racket and ball to assess the same movement.…”

Section: Introductionmentioning

confidence: 99%

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Effects of an Extrinsic Constraint on the Tennis Serve

Mendes

Couceiro

Rocha

et al. 2015

International Journal of Sports Science & Coaching

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This study analysed the extrinsic constraint of induced aerodynamic flow (IAF) on the first serve by expert tennis players with temporal organization of the movement, as well as the velocity and amplitude of the racket motion analyzed. Twelve expert right-handed tennis players voluntarily participated in this study. Each player performed 20 trials without IAF and another 20 trials for each different speed configuration of induced cross-wind: 2.4 m/s; 4.3 m/s; 5.8 m/s; and random speed. The coefficient of variation, r-pearson test and the inferential test one-way ANOVA were used to compare movement data. The results suggest spatio-temporal adjustments depending on the wind speed. Moreover, statistical differences were identified on both the temporal organization of the serve and on the racket's motion amplitude and velocity. The intra- and inter-individual variability of the motor behavior shows the uniqueness of the serve movement of each player.

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Section: Induced Aerodynamic Flow Devicementioning

confidence: 99%

Section: Induced Aerodynamic Flow Devicementioning

confidence: 99%

Section: Analysis Devicementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of an Extrinsic Constraint on the Tennis Serve

Mendes

Couceiro

Rocha

et al. 2015

International Journal of Sports Science & Coaching

Self Cite

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“…Surgido na Inglaterra na década de 1870, se tornou um esporte olímpico e é, atualmente, um dos esportes mais praticados no Brasil, com aproximadamente 1,5 milhão de jogadores 1,2 . O tênis vem sendo cada vez mais estudado no Brasil e já apresenta número de publicações importante em algumas áreas, como psicologia do esporte [3][4][5] , desenvolvimento técnico-tático [6][7][8] e treinamento esportivo [9][10][11] . Contudo, a pedagogia do esporte voltada ao tênis ainda carece de estudos.…”

Section: Introductionunclassified

Contribuições da competição de tênis na educação e formação de crianças

Gonçalves

Klering

Aires³

et al. 2016

J Physical Edu

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RESUMOEste estudo trata da competição de tênis infantil e sua relação com a educação e formação de crianças. O estudo se justifica pelo fato do tênis ser um esporte que culturalmente valoriza aspectos morais e éticos e por ter recentemente alterado suas regras para competições infantis. O objetivo geral do estudo é descrever e explorar o atual modelo competitivo de tênis das categorias até 10 anos quanto aos seus aspectos educativos e de formação pessoal, segundo a opinião de especialistas. Foram entrevistados onze treinadores de tênis com experiência na área e os resultados indicaram uma importante evolução com relação ao modelo competitivo anterior. No entanto, algumas adequações ainda parecem necessárias. As principais seriam: novas modalidades competitivas, tornando o esporte mais inclusivo e educativo; maior valorização do empenho, consequentemente menor foco no resultado; e maior número de participações competitivas, podendo-se alterar formatos competitivos e calendário. Palavras-chave: Tênis. Esporte. Educação. ABSTRACTThis study addresses the Tennis 10's competition and its relation to children's education and personal development. The study justifies itself as tennis is a sport that values moral and ethical aspects and changed recently its rules in children competitions. The aim of this study is to describe and explore the current child tennis competition model in its educational and personal developmental aspects, according to specialists' opinions. Eleven coaches with expertise in the area were interviewed and the results showed an important evolution with the new model compared to the previous. However some adjustments still seem necessary. The main ones would be: new competitive modalities, turning the sport more inclusive and educational; greater value to effort, consequently minor focus in results; and higher number of competitive participations, being able to alter competitive formats and calendar. Keywords: Tennis. Sport. Education. IntroduçãoO tênis é um esporte com aproximadamente 140 anos de história. Surgido na Inglaterra na década de 1870, se tornou um esporte olímpico e é, atualmente, um dos esportes mais praticados no Brasil, com aproximadamente 1,5 milhão de jogadores 1,2 . O tênis vem sendo cada vez mais estudado no Brasil e já apresenta número de publicações importante em algumas áreas, como psicologia do esporte 3-5 , desenvolvimento técnico-tático 6-8 e treinamento esportivo [9][10][11] . Contudo, a pedagogia do esporte voltada ao tênis ainda carece de estudos. Alguns autores 12-15 sugerem que a pedagogia do esporte não deve limitar-se ao ensino dos movimentos, como aspectos relacionados à técnica e à tática. Segundo estes autores, aspectos educacionais, de inclusão, éticos e morais são tão importante quanto os apresentados anteriormente e devem fazer parte da condução e ensino do esporte.A competição esportiva, por sua vez, é a essência do fenômeno Esporte [16][17][18] . No entanto, é pouco explorada em seus aspectos pedagógicos específicos. Portanto, o presente estudo trata da comp...

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Efecto de un programa de entrenamiento táctico en fútbol juvenil: caso único

Valencia Sánchez

2021

ebm.jss

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The objective is to determine the effect of a training program using an active method in youth football. The study had a unique case design with pretest and post-test measurements. The participants were 18 soccer players under 15 from a club in the city of Medellin (14,94±0,4 years; 166,33±0,05 cm; 54,09±5,96 kg; 19,52±1,56 Kg/m2; 0,98±1,15 years of experience). The intervention was carried out during 20 training units in 10 weeks, which had as learning contents the offensive tactical principles of evolution. The evaluations were following up of friendly football matches with a control group that had characteristics similar to the experimental group. The games were recorded and analyzed using a previously validated observation protocol. The analysis unit was made up of 605 ball recoveries and 301 offensive sequences in total. Pearson's chi-squared test (x2) was applied for the analysis of pre-post test differences. The results indicate a statistically significant increase in offensive performance (p = 0, 04) among the number of post-test offensive sequences compared to the pretest of the experimental group. It is recommended to use a training program based on the tactical component using the active method to increase offensive performance.

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Dispositivo de escoamento aerodinâmico induzido para análise do desempenho do serviço de ténis

Cited by 3 publications

References 0 publications

Effects of an Extrinsic Constraint on the Tennis Serve

Effects of an Extrinsic Constraint on the Tennis Serve

Contribuições da competição de tênis na educação e formação de crianças

Efecto de un programa de entrenamiento táctico en fútbol juvenil: caso único

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