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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Avaliação biomecânica do mecanismo de lesões associadas à prática do tênis de campo / Biomechanical evaluation of the mechanism of injury associated with the practice of court tennis

Bersanetti, Michelli Belotti 24 February 2014 (has links)
A repetitividade dos golpes em uma partida de tênis pode sobrecarregar a musculatura do punho e predispor a lesões, como a epicondilite lateral. A presente pesquisa propõe o uso de visão computacional para a obtenção de imagens tridimensionais reconstruídas, valores de forças atuantes em grupos musculares e articulações específicas e posições, velocidades e acelerações. O objetivo deste estudo é propor um método para descrever as características biomecânicas dos movimentos do punho durante a prática do tênis de campo, segundo as técnicas de punho rígido, a partir de parâmetros dinâmicos e cinemáticos, segundo variáveis físicas e antropométricas. Um indivíduo do sexo masculino, que possuí domínio das técnicas analisadas, realizou cinco sequências do movimento forehand em um laboratório de análise do movimento. Foi utilizado um sistema de aquisição de imagens (Qualisys Motion Capture Systems) que permitiu a reconstrução tridimensional dos movimentos dos segmentos. A partir de dados obtidos, através do sistema, verificou-se que os torques encontrados nos três eixos de movimento do punho, correspondentes aos movimentos de pronação, desvio ulnar e flexão de punho, apresentam magnitudes de 1.11 Nm, 3.98 Nm e 7.68 Nm, respectivamente. Verificou-se o maior valor de torque em torno do eixo z (flexão do punho), que será sustentado pela musculatura extensora de punho. A sobrecarga repetitiva dessa musculatura pode desencadear a epicondilite lateral. / The repeatability of the hitting in a tennis match can overload the muscles of the wrist and predispose to injury, such as lateral epicondylitis. This research proposes the use of computer vision for obtaining reconstructed three-dimensional images, active forces values in specific joints and muscle groups and positions, velocities and accelerations. The objective of this study is to propose a method to describe the biomechanical characteristics of the movements of the wrist during the practice of court tennis, using static wrist techniques, from kinematic and dynamic parameters, according to physical and anthropometric variables. A male person, who possess mastery of the techniques analyzed, held five forehand motion sequences in a laboratory analysis of the movement. It was used an image acquisition system (Qualisys Motion Capture Systems) that allowed the three-dimensional reconstruction of the movements of the segments. From the data obtained, through the system, it was found the torques in the three axes of motion of the wrist, corresponding to the movements of pronation, wrist flexion and ulnar deviation, which presented magnitudes of 1.11 Nm, 3.98 Nm and 7.68 Nm, respectively. It was found the greatest value of torque around the z axis (wrist flexion), which will be sustained by the extensor muscle of wrist. Repetitive overload of this muscle can unleash the epicondylitis.
2

Avaliação biomecânica do mecanismo de lesões associadas à prática do tênis de campo / Biomechanical evaluation of the mechanism of injury associated with the practice of court tennis

Michelli Belotti Bersanetti 24 February 2014 (has links)
A repetitividade dos golpes em uma partida de tênis pode sobrecarregar a musculatura do punho e predispor a lesões, como a epicondilite lateral. A presente pesquisa propõe o uso de visão computacional para a obtenção de imagens tridimensionais reconstruídas, valores de forças atuantes em grupos musculares e articulações específicas e posições, velocidades e acelerações. O objetivo deste estudo é propor um método para descrever as características biomecânicas dos movimentos do punho durante a prática do tênis de campo, segundo as técnicas de punho rígido, a partir de parâmetros dinâmicos e cinemáticos, segundo variáveis físicas e antropométricas. Um indivíduo do sexo masculino, que possuí domínio das técnicas analisadas, realizou cinco sequências do movimento forehand em um laboratório de análise do movimento. Foi utilizado um sistema de aquisição de imagens (Qualisys Motion Capture Systems) que permitiu a reconstrução tridimensional dos movimentos dos segmentos. A partir de dados obtidos, através do sistema, verificou-se que os torques encontrados nos três eixos de movimento do punho, correspondentes aos movimentos de pronação, desvio ulnar e flexão de punho, apresentam magnitudes de 1.11 Nm, 3.98 Nm e 7.68 Nm, respectivamente. Verificou-se o maior valor de torque em torno do eixo z (flexão do punho), que será sustentado pela musculatura extensora de punho. A sobrecarga repetitiva dessa musculatura pode desencadear a epicondilite lateral. / The repeatability of the hitting in a tennis match can overload the muscles of the wrist and predispose to injury, such as lateral epicondylitis. This research proposes the use of computer vision for obtaining reconstructed three-dimensional images, active forces values in specific joints and muscle groups and positions, velocities and accelerations. The objective of this study is to propose a method to describe the biomechanical characteristics of the movements of the wrist during the practice of court tennis, using static wrist techniques, from kinematic and dynamic parameters, according to physical and anthropometric variables. A male person, who possess mastery of the techniques analyzed, held five forehand motion sequences in a laboratory analysis of the movement. It was used an image acquisition system (Qualisys Motion Capture Systems) that allowed the three-dimensional reconstruction of the movements of the segments. From the data obtained, through the system, it was found the torques in the three axes of motion of the wrist, corresponding to the movements of pronation, wrist flexion and ulnar deviation, which presented magnitudes of 1.11 Nm, 3.98 Nm and 7.68 Nm, respectively. It was found the greatest value of torque around the z axis (wrist flexion), which will be sustained by the extensor muscle of wrist. Repetitive overload of this muscle can unleash the epicondylitis.
3

Play and Stay 10s systém / Play and Stay 10s system

Rollinger, Michal January 2018 (has links)
Title: Play and stay 10s system The thesis "Play and stay 10s system" follow up compilation of available literature dealing with training of children under 10 years old. This system i salso applicable to older children beginners or even adult beginners. The aim of the thesis is to analyze this system prefered by ITF and subscribe it to Czech trainers and coaches or those who are interested in tennis methodology for this age category. The problem in this category is the fact that a large amount of athletes have other sport opportunities than tennis. The outflow of athletes from this sport is caused by direct corrective form of teaching that children do not like. And as many people think, it goes to collective and more entertaining sports where the game itself is beginning from first lesson. The slogan of tennis 10s is "Serve, rallye, score". This system has caused worldwide rise and popularity among children and adults. Tennis taught in this way is more attractive and fun. Key words: tennis, methodology, training of children under 10 years, fun form, midi court

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