Letteratura scientifica selezionata sul tema "Biomechanics of tennis"

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Articoli di riviste sul tema "Biomechanics of tennis"

1

Elliott, B. "Biomechanics and tennis". British Journal of Sports Medicine 40, n. 5 (1 maggio 2006): 392–96. http://dx.doi.org/10.1136/bjsm.2005.023150.

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Hong, Hui Hui, e Liang Han. "Sports Biomechanical Research and Exploration on the Tennis Injuries". Applied Mechanics and Materials 494-495 (febbraio 2014): 301–4. http://dx.doi.org/10.4028/www.scientific.net/amm.494-495.301.

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Abstract (sommario):
Tennis is very popular, but the incorrect action produces sports injuries. The knowledge of sports biomechanics is used in sports injury research on tennis. Two mainly classical research methods on tennis sports biomechanics are theoretical research and experimental study. This paper introduces the technical features of two research methods, theoretical research is mainly based on the model. The experimental study is mainly based on three systems of the kinematics, dynamics and biological measurement. The differences among them are compared in order to provide the overall ideas for study on sports injury of tennis.
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Elliott, Bruce C. "Biomechanics of the Serve in Tennis". Sports Medicine 6, n. 5 (novembre 1988): 285–94. http://dx.doi.org/10.2165/00007256-198806050-00004.

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4

Groppel, Jack L. "The Biomechanics of Tennis: An Overview". International Journal of Sport Biomechanics 2, n. 3 (agosto 1986): 141–55. http://dx.doi.org/10.1123/ijsb.2.3.141.

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KIBLER, W. BEN. "Clinical biomechanics of the elbow in tennis". Medicine & Science in Sports & Exercise 26, n. 10 (ottobre 1994): 1203???1206. http://dx.doi.org/10.1249/00005768-199410000-00004.

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Wong, Duo Wai-Chi, Winson Chiu-Chun Lee e Wing-Kai Lam. "Biomechanics of Table Tennis: A Systematic Scoping Review of Playing Levels and Maneuvers". Applied Sciences 10, n. 15 (28 luglio 2020): 5203. http://dx.doi.org/10.3390/app10155203.

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Abstract (sommario):
This present study aims to review the available evidence on the biomechanics of table-tennis strokes. Specifically, it summarized current trends, categorized research foci, and biomechanical outcomes regarding various movement maneuvers and playing levels. Databases included were Web of Science, Cochrane Library, Scopus, and PubMed. Twenty-nine articles were identified meeting the inclusion criteria. Most of these articles revealed how executing different maneuvers changed the parameters related to body postures and lines of movement, which included racket face angle, trunk rotation, knee, and elbow joints. It was found that there was a lack of studies that investigated backspin maneuvers, longline maneuvers, strikes against sidespin, and pen-hold players. Meanwhile, higher-level players were found to be able to better utilize the joint power of the shoulder and wrist joints through the full-body kinetic chain. They also increased plantar pressure excursion in the medial-lateral direction, but reduced in anterior-posterior direction to compromise between agility and dynamic stability. This review identified that most published articles investigating the biomechanics of table tennis reported findings comparing the differences among various playing levels and movement tasks (handwork or footwork), using ball/racket speed, joint kinematics/kinetics, electromyography, and plantar pressure distribution. Systematically summarizing these findings can help to improve training regimes in order to attain better table tennis performance.
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Paul Roetert, E., Howard Brody, Charles J. Dillman, Jack L. Groppel e Jeanne M. Schultheis. "The Biomechanics of Tennis Elbow: An Integrated Approach". Clinics in Sports Medicine 14, n. 1 (gennaio 1995): 47–57. http://dx.doi.org/10.1016/s0278-5919(20)30257-x.

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KIMURA, Daisuke, Akira IWATA, Masato SHIMA, Kuniharu OKUDA e Jun KAWASAKI. "Biomechanics of Serve Motion in Wheelchair Tennis Players". Journal of the Japanese Physical Therapy Association 16, n. 1 (2013): 41. http://dx.doi.org/10.1298/jjpta.vol16_010.

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Li, Liang, Feng Ren e Julien S. Baker. "The Biomechanics of Shoulder Movement with Implications for Shoulder Injury in Table Tennis: A Minireview". Applied Bionics and Biomechanics 2021 (8 maggio 2021): 1–6. http://dx.doi.org/10.1155/2021/9988857.

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Abstract (sommario):
A high proportion of shoulder injuries in table tennis players are common, which is both a diagnostic and therapeutic challenge. An understanding of the interaction between biomechanical function of the shoulder and mechanisms of shoulder injuries in table tennis players is necessary to prevent injury and to conduct clinical treatment of the shoulder as soon as possible. The purpose of this minireview was to select the available evidence on the biomechanical characteristics of shoulder movement and potential relationships with various shoulder injuries that are common in table tennis players. Five studies revealed interesting biomechanical characteristics of shoulder movement patterns in table tennis players: large internal rotation torque, an increased torsion-rotation movement, and a greater angular velocity of internal rotation were found. Two studies were noted that were related to specific shoulder injury: glenohumeral internal rotation deficit (GIRD) and impingement syndrome. Unfortunately, it is difficult to draw conclusions on the mechanisms of shoulder injury in table tennis players due to the little evidence available that has investigated shoulder injury mechanisms based on biomechanical characteristics. Future studies should focus on the potential relationship between the biomechanical characteristics of the shoulder and injury prevalence to provide valuable reference data for clinical treatment.
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Roetert, E. Paul, Todd S. Ellenbecker e Machar Reid. "Biomechanics of the Tennis Serve: Implications for Strength Training". Strength and Conditioning Journal 31, n. 4 (agosto 2009): 35–40. http://dx.doi.org/10.1519/ssc.0b013e3181af65e1.

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Più fonti

Tesi sul tema "Biomechanics of tennis"

1

Espinoza, Victor. "Gesture Recognition in Tennis Biomechanics". Master's thesis, Temple University Libraries, 2018. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/530096.

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Electrical and Computer Engineering
M.S.E.E.
The purpose of this study is to create a gesture recognition system that interprets motion capture data of a tennis player to determine which biomechanical aspects of a tennis swing best correlate to a swing efficacy. For our learning set this work aimed to record 50 tennis athletes of similar competency with the Microsoft Kinect performing standard tennis swings in the presence of different targets. With the acquired data we extracted biomechanical features that hypothetically correlated to ball trajectory using proper technique and tested them as sequential inputs to our designed classifiers. This work implements deep learning algorithms as variable-length sequence classifiers, recurrent neural networks (RNN), to predict tennis ball trajectory. In attempt to learn temporal dependencies within a tennis swing, we implemented gate-augmented RNNs. This study compared the RNN to two gated models; gated recurrent units (GRU), and long short-term memory (LSTM) units. We observed similar classification performance across models while the gated-methods reached convergence twice as fast as the baseline RNN. The results displayed 1.2 entropy loss and 50 % classification accuracy indicating that the hypothesized biomechanical features were loosely correlated to swing efficacy or that they were not accurately depicted by the sensor
Temple University--Theses
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Zhang, Zhiqing. "Biomechanical analysis and model development applied to table tennis forehand strokes". Thesis, Loughborough University, 2017. https://dspace.lboro.ac.uk/2134/24902.

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Abstract (sommario):
Table tennis playing involves complex spatial movement of the racket and human body. It takes much effort for the novice players to better mimic expert players. The evaluation of motion patterns during table tennis training, which is usually achieved by coaches, is important for novice trainees to improve faster. However, traditional coaching relies heavily on coaches qualitative observation and subjective evaluation. While past literature shows considerable potential in applying biomechanical analysis and classification for motion pattern assessment to improve novice table tennis players, little published work was found on table tennis biomechanics. To attempt to overcome the problems and fill the gaps, this research aims to quantify the movement of table tennis strokes, to identify the motion pattern differences between experts and novices, and to develop a model for automatic evaluation of the motion quality for an individual. Firstly, a novel method for comprehensive quantification and measurement of the kinematic motion of racket and human body is proposed. In addition, a novel method based on racket centre velocity profile is proposed to segment and normalize the motion data. Secondly, a controlled experiment was conducted to collect motion data of expert and novice players during forehand strokes. Statistical analysis was performed to determine the motion differences between the expert and the novice groups. The experts exhibited significantly different motion patterns with faster racket centre velocity and smaller racket plane angle, different standing posture and joint angular velocity, etc. Lastly, a support vector machine (SVM) classification technique was employed to build a model for motion pattern evaluation. The model development was based on experimental data with different feature selection methods and SVM kernels to achieve the best performance (F1 score) through cross-validated and Nelder-Mead method. Results showed that the SVM classification model exhibited good performance with an average model performance above 90% in distinguishing the stroke motion between expert and novice players. This research helps to better understand the biomechanical mechanisms of table tennis strokes, which will ultimately aid the improvement of novice players. The phase segmentation and normalization methods for table tennis strokes are novel, unambiguous and straightforward to apply. The quantitative comparison identified the comprehensive differences in motion between experts and novice players for racket and human body in continuous phase time, which is a novel contribution. The proposed classification model shows potential in the application of SVM to table tennis biomechanics and can be exploited for automatic coaching.
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Rossi, Jeremy. "Analyse biomécanique de l'interface main-raquette lors de la pratique du tennis : applications à l'étude du tennis elbow". Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4074.

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Abstract (sommario):
Le tennis elbow est une pathologie fréquente affectant le membre supérieur. Cette pathologie s'observe également dans un large éventail d'activités manuelles allant de la manipulation d'outils de maçonnerie à la manipulation d'une souris d'ordinateur. Malgré son prévalence élevée, les mécanismes sous-jacents au développement du tennis elbow demeurent paradoxalement largement méconnus et n'offrent pas de consensus scientifique. Toutefois, les outils, les instruments ou les objets manipulés, formant une interface avec la main, sont soupçonnés d'être en partie responsables de l'apparition de cette affection. Cependant, le manque de moyens d'investigation biomécanique sur la main ramène cette assertion au statut d'hypothèse. Dans ce travail de thèse, l'idée que les caractéristiques physiques de la raquette (i.e. taille et forme du manche ; inertie de la raquette) puissent avoir une influence sur le risque d'apparition du tennis elbow a été testée. Pour cela, nous avons mené une démarche structurée en trois étapes. Tout d'abord, une approche expérimentale contrôlée nous a permis de quantifier les efforts exercés au niveau de l'interface main-manche lorsque l'on serre simplement ce dernier. Pour cela, un instrument de mesure des forces a été développé (i.e. ergomètre à 6 poutres couplé à une nappe de pression Tekscan). Cela nous a permis de définir une taille et une forme de manche optimale pour les forces de serrage. Dans un second temps, ce manche optimal (i.e. de section circulaire et de périmètre égal à 17,9% de la longueur de la main) a été testé au cours de frappes de tennis
Lateral epicondylalgia (LE) have been reported to occur at least once in a range of 40% to 50% of tennis players and in a large number of workers using hand tools. Despite high prevalence, the mechanisms underlying the development of tennis elbow are paradoxically misunderstood and suffer from a lack of scientific consensus. The characteristics of the handled tools (e.g. the grip size and the shape) are believed to be partly responsible for the occurrence of these disorders. However, the available material and technique for investigation and the proceedings studies did not gave evidence for this hypothesis. In this work, the idea that the size and shape of a tennis racket handle can affect the risk of developing tennis elbow was tested in three main steps. First, a controlled experimental approach was performed in order to quantify the forces exerted at the interface hand / handle when squeezing simply a handle. A special force ergometer has been developed to measure the forces at the hand/handle interface. This study enabled us to define an optimal size and shape (i.e. circular perimeter equal to 18% of the length of the hand) to perform a maximal squeezing force. In a second step, the optimal handle was tested during tennis strokes. Our results show that with and without fatigue, the grip force was lower for the optimal handle compared to bigger or smaller handle. Finally, in a last step, a biomechanical model of the hand was used to assess the impact of the tennis racket grip size on the forces applied on muscles affected by tennis elbow during a simulation. Our results suggest that the optimal grip size reduces muscle tensions of hand extensor muscle
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Martin, Caroline. "Analyse biomécanique du service au tennis : lien avec la performance et les pathologies du membre supérieur". Phd thesis, Université Rennes 2, 2013. http://tel.archives-ouvertes.fr/tel-00919831.

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Abstract (sommario):
Les joueurs de tennis sont confrontés à un problème fondamental : comment améliorer la vitesse de leur service tout en limitant le plus possible les risques de pathologies chroniques ? L'objectif de ce travail est d'analyser, d'identifier et de comprendre les facteurs biomécaniques responsables de l'amélioration de la performance et de l'apparition des blessures articulaires chroniques lors de la réalisation du service au tennis. A partir de captures de mouvement en 3D chez des joueurs professionnels, la première étude s'attache à analyser les relations entre les valeurs de moments cinétiques segmentaires et la vitesse de balle au service. Grâce à une approche combinant captures de mouvement en laboratoire et suivi épidémiologique, la seconde étude explore l'influence du niveau d'expertise sur les contraintes articulaires du membre supérieur lors de la réalisation du service et sur l'apparition de blessures articulaires chroniques. La troisième étude identifie des facteurs "pathomécaniques" du service en comparant les mouvements de joueurs "sains" avec ceux de joueurs "blessés". La quatrième étude s'intéresse aux relations pouvant exister entre la vitesse de balle, les contraintes articulaires et le transfert de l'énergie mécanique lors du service. Enfin, la dernière étude porte sur l'influence de la fatigue musculaire sur la biomécanique, les risques de blessures et la performance du service lors d'un match de tennis prolongé. L'ensemble de ce travail démontre qu'il est à la fois possible d'améliorer la performance sportive et de limiter les risques de blessures grâce à la réalisation d'un geste de service "juste" sur le plan biomécanique
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Starbuck, Chelsea. "Player perceptions and biomechanical responses to tennis court surfaces : the implications to technique and injury risk". Thesis, University of Exeter, 2014. http://hdl.handle.net/10871/16557.

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Abstract (sommario):
Elite tennis players are required to perform on a variety of tennis court surfaces which differ in mechanical characteristics, such as friction and hardness, influencing their performance and risk of injury. To understand the influence of surfaces on performance and injury risk, three studies were conducted to investigate tennis players' perceptions and biomechanical responses during tennis-specific movements on different court surfaces. In study 1, tennis players perceptions of acrylic and clay courts were identified following a thematic inductive analysis of semi-structured interviews (n = 7) to develop a series of visual analogue scales (VAS) to quantify perceptions during studies 2 and 3. Perceptions of predictability of the surface and players' ability to slide and change direction emerged, in addition to anticipated perceptions of grip and hardness. Study 2 aimed to examine the influence of court surfaces and prior clay court experience on perceptions and biomechanical characteristics of tennis-specific skills. Perception, kinematic, insole pressure and mechanical data were collected on an acrylic and a clay court. In agreement with findings reported in study 1, lower mechanical friction and hardness on the clay court were perceived and accompanied by less predictability and greater difficulty to change direction whilst being easier to slide. As result of sliding, players' adopted an altered technique on the clay court compared to the acrylic leading to reductions in loading provide evidence to explain lower injury risks previously reported on clay courts. Prior clay court experience did not influence players' perceptions. However, biomechanical response to the clay surface differed, such that players with high clay court experiences contacted the ground with an everted foot, believed to contribute to controlling sliding. Differences in perception-response relationships were reported between experience groups suggesting players with greater clay court experience are better able to choose an appropriate response to improve their performance. Friction properties of the surface may change during play on clay courts due to player movements and sliding on the court. Therefore there may be areas of expected and unexpected changes to friction to which players must respond to. Study 3 aimed to examine the influence of changes in friction and players awareness of these changes on perceptions and biomechanical response. Compared with study 1 and 2, players found it more difficult to identify differences in perceived grip during study 3, possibly due the smaller mechanical friction differences reported. Unexpected reductions in friction produced greater initial ankle inversion angles compared to the expected decreases in friction, increasing players' risk of injury. Lower horizontal and vertical loading rates were reported on the lower friction conditions where further sliding was reported; suggesting a reduced injury risk by allowing longer time spent applying the forces. This thesis has identified key perception variables that enabled a holistic understanding of perceptions and their interaction with biomechanical response. Mechanical friction was an important factor influencing players' ability to slide. Sliding on clay resulted in altered loading characteristics, pressure distributions and kinematics potentially reducing players' injury risk. Tennis players' experience of clay courts does not influence their perceptions of the surface but the response that players adopt, which lower their risk of injury and increase performance. It is important when playing on a clay court that friction properties are maintained across the court during a tennis match as much as possible to reduce injury risks, due to the influence of unexpected changes to friction on perceptions and response.
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Herbaut, Alexis. "Influence de la chaussure sur la biomécanique du jeune joueur de tennis : adaptations à court et moyen termes". Thesis, Valenciennes, 2016. http://www.theses.fr/2016VALE0010.

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Abstract (sommario):
De nos jours, la plupart des fabriquants de chaussures proposent des chaussures pour les jeunes joueurs de tennis qui sont des modèles réduits de celles des adultes. Cependant, les enfants ne sont pas des adultes-miniatures et ont des besoins spécifiques. Entre 8 et 12 ans, les enfants sont sujets à des poussées de croissance qui diminuent la flexibilité du membre inférieur et augmentent les forces de tension sur les sites d’insertions des tendons sur les os. De plus, la pratique du tennis à haute intensité, avec la répétition d’accélérations et décélérations, place d’importantes forces de tension au niveau de l’insertion du tendon d’Achille sur le calcaneus et d’importantes forces de compression sous le calcaneus. La combinaison de ces 2 facteurs augmente le risque de subir l’une des principales blessures de sursollicitaton chez les enfants : la maladie de Sever. Par conséquent, l’objectif de ce travail de thèse était de définir les caractéristiques d’un chaussant adapté au joueur de tennis enfant en terme de volume chaussant confortable et de limitation des blessures. Premièrement, une chaussette équipée de capteurs de pressions textiles a été conçue et la fiabilité de sa mesure a été validée. Ensuite, cet outil innovant a été utilisé afin de corréler la mesure de pression et la perception du confort sur 8 zones du pied, permettant ainsi de déterminer le volume intérieur de la chaussure optimal pour le joueur de tennis enfant. Deuxièmement, les effets aigus du drop de la chaussure sur la biomécanique des joueurs de tennis enfants ont été examinés et il a été montré que la réduction de 12 mm à 6 mm permettait de réduire les forces de réaction du sol et donc potentiellement les blessures liées à l’impact. Enfin, l’influence à long-terme de la réduction du drop de la chaussure sur la biomécanique et les douleurs au talon reportées par les jeunes joueurs de tennis a été investiguée. La réduction progressive du drop de la chaussure a induit un changement de patron de pose du pied, arrière vers avant-pied, pour la moitié des participants et a permis de supprimer leurs douleurs au talon. De futures études sont nécessaires pour examiner les adaptations structurelles du membre inférieur liées à l’utilisation de chaussures partiellement minimalistes
Nowadays, most of tennis footwear manufacturers propose children tennis shoes that are scaled-down from adult shoes. However, children are not adult-miniature and have specific needs. Between 8 and 12 years old, children experience growth spurts that decrease the lower limb flexibility and increase the tensile forces on tendons insertion sites onto bones. In addition, the practice of tennis in high-intensity, with the repetition of accelerations and decelerations, places high tensile forces at the Achilles tendon insertion site onto the calcaneus and large compressive forces under the calcaneus. The combination of these 2 factors increase the risk to experience one of the main overuse injuries in children: Sever’s disease. Therefore, the aim of this thesis work was to define the features of a suitable footwear for children tennis players in terms of fitting comfort and limitation of injuries. Firstly, a sock equipped with textile pressure sensors was designed and its measurement reliability was validated. Then, this innovative device was used to correlate pressure measurement and comfort perception on 8 foot locations, allowing to determine the optimal inner-shoe volume for children tennis players. Secondly, the acute effects of shoe drop on the biomechanics of children tennis players were examined and it was shown that reducing from 12 mm to 6 mm allowed to reduce ground reaction forces and thus potentially impact-related injuries. Finally, the long-term influence of shoe drop reduction on the biomechanics and heel pain reported by children tennis players was investigated. The gradual reduction in shoe drop induced a switch from a rear- to forefoot strike pattern in half of the participants and allowed to remove heel pain for them. Future studies are needed to examine the lower-limb structural adaptations linked to the use of partial minimalist shoes
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Bascou, Joseph. "Analyse biomécanique pour la compréhension et l’amélioration du fauteuil roulant dans son application au tennis de haut niveau". Thesis, Paris, ENSAM, 2012. http://www.theses.fr/2012ENAM0048/document.

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Le développement et la médiatisation du sport de haut niveau, notamment en fauteuil roulant, ont changé l 'image du handicap et favorisé le développement d'infrastructures permettant la pratique handisport, reconnue comme bénéfique pour la santé physique et psychique des personnes handicapées...Dans ce contexte, en partenariat avec un joueur de tennis fauteuil de haut niveau, l'objet de ces travaux a été d'étudier l'influence des réglages du fauteuil roulant sur son comportement en match, afin de l'optimiser pour le sport concerné. Ces travaux se concentrent d'abord sur les résistances au mouvement, en particulier dans les paliers des roues, lors du roulement en ligne droite et en rotation. La méthode consiste à créer d'abord un modèle mécanique représentatif du mouvement pour ensuite le valider avec une série d'expérimentations et l'exploiter. L'étude du sportif en mouvement sur son fauteuil a nécessité l'adaptation d'un modèle volumique à une personne assise, avec estimation des paramètres inertiels par mesures rapides. Ce modèle a été appliqué à l'étude de la propulsion à vitesse maximale, pour vérifier l'influence de la position du siège sur ce mouvement. Enfin une étude expérimentale des paramètres influant sur la rotation du fauteuil a mis en avant la forte influence de la position du centre de gravité du sujet sur la rotation, corroborée par un modèle mécanique.Les résultats issus de ces travaux ont permis de mieux comprendre les influences des réglages sur le comportement du fauteuil, de modifier certains réglages pour le sportif et d'orienter la conception d'un nouveau fauteuil. Ces études ont par ailleurs eu des retombées sur les fauteuils conventionnels et entre temps, notre sportif est devenu N°1 mondial
The development of Paralympics has done a lot for a more positive image of handicap and has opened up new opportunities for the practice of disability sport, known to be highly beneficial for the physical and psychological health of disabled people. Conducted in close partnership with a high level tennis player, this study focuses on the influence of the wheelchair settings on its behavior in order to adapt this behavior to wheelchair tennis playing. The study first highlighted the forces of resistance to straight line or rotating wheelchair movements, thanks to mechanical models validated by experiments. Then, the inertial parameters of the seated player's body segments were assessed by adapting a volumic model to the sitting position, and his propulsion at maximal velocity was studied, in order to understand the effect of the seat fore-and-aft position on this movement. Then, an experimental study proved the major influence of the center of gravity position on free rotation, which was modelized too.In a nutshell, this research work has led to a better understanding of the effects of the wheelchair settings on its behavior, its results have allowed to modify various settings on our partner's wheelchair and can be used as a basis for future wheelchair conception/design. They have also proved useful for conventional wheelchairs and in the meantime, our tennis player partner has become wheelchair tennis world champion…
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Peixoto, Christian Savelli de Lorena. "A biomecânica do tênis de campo e a sua prática otimizada". Universidade de São Paulo, 1999. http://www.teses.usp.br/teses/disponiveis/82/82131/tde-26102017-092122/.

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Abstract (sommario):
O movimento pendular é dotado de qualidades dinâmicas, estratégicas e biomecânicas que o tornam padrão de excelência para o ensino do tênis. Ele reduz em até uma ordem de grandeza o esforço físico dispendido e elimina os riscos de tendinites do tipo \"cotovelo de tenista\". Transfere, dentro da maior eficiência, o impulso do chão sobre os pés para os quadris, tórax, braço e raquete. Naturalmente mantém o braço esticado e o punho rígido. Maximiza a velocidade da raquete e minimiza a indicação de endereçamento da bola. Estes são as conclusões do presente trabalho, buscando-se uma comparação direta das qualidades do movimento pendular frente as práticas de movimentação difundidas atualmente para o tênis de campo. São utilizadas conceituações dinâmicas e biomecânicas simples, fundamentadas na anatomia das inserções musculares, dos centros de gravidade e de rotação dos segmentos do corpo envolvidos nos movimentos. Os resultado indicam um aumento de eficiência com a utilização da movimentação pendular, atingindo-se um ganho médio de 10% em velocidade da raquete com uma redução do impulso no solo de cerca de 20%.
The pendular movement for the practice of optimized tennis has been under study as a graduate project at the Escola de Engenharia de São Carlos, Universidade de São Paulo-Brazil since 1977. The proposed procedure is based on the Newton\'s Laws of dynamics. The pendular movement incorporates dynamic, strategic, and biomechanical qualities that lends itself to a standard of excellence for tennis coaching. It reduces the dispended physical effort by one order of magnitude as well as eliminating the risk of tendinitis, among them the well known \"tennis elbow\". It also transfers the impulse received from the ground through the feet to the hip, torax, arm and raquet with the maximum efficiency. It keeps the arm naturally extended and the wrist rigid. It also maximizes the velocity of the raquet and reduces to a minimum the chances of the opponent anticipating the addressing of the ball. The characterisics of the pendular movement are compared to the other fundamental movements, the vertical, the rigid and the free movement. Simple dynamic and biomechanical concepts are utilized, based on the anatomy of muscular tendon insertions, on the centres of gravity and rotation of the body segments involved in the movement.
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Vieira, Cláudio Luís Roveri 1985. "Proposição de um método de análise de movimentos de jogadores de tênis de campo a partir de vídeos televisivos = Proposition of a method for tennis players motion analysis on broadcast videos". [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/275113.

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Abstract (sommario):
Orientador: Ricardo Machado Leite de Barros
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Educação Física
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Resumo: O objetivo do presente estudo é propor um conjunto de métodos para análise de movimentação de jogadores de tênis de campo a partir de vídeos pré calibrados com uso de câmeras fixas, bem como em vídeos televisivos. Primeiramente, foi proposto e validado um método para rastrear automaticamente jogadores de tênis de campo a partir de vídeos coletado in loco e de câmeras fixas e previamente calibradas. O percentual de rastreamento automático foi de 99,98%. As distâncias percorridas pelos dois jogadores durante um set de uma partida de tênis também puderam ser calculadas. A reconstrução das coordenadas bidimensionais da quadra foi validada calculando a repetibilidade intra-operador (0,009 m), a repetibilidade inter-operador (0,007 m), o erro relativo (comprimento e largura 0,03% 0,06%). O erro de medição alcançada para a posição do jogador foi de 0,36 m. Para ambas as coordenadas houve uma regressão linear significativa (R2 > 0,99, p <0,05) das posições obtidas pelos métodos de rastreamento automático e manual. Além disso, as distâncias percorridas por ambos os jogadores puderam ser extraídas como exemplo de aplicação do método. O segundo método proposto foi o de detecção automática de rallies em vídeos televisivos de tênis. O método desenvolvido foi baseado na extração de histograma, filtragem de percentuais estatísticos e semelhança com um quadro de referência. Três vídeos de partidas de tênis representando três diferentes pisos foram utilizados para avaliar o método proposto. O percentual médio de acerto dos cortes foi de 81%. A duração dos rallies obtidos com o método proposto são comparáveis ao método manual e adequado para determinar a duração dos mesmos para todos os vídeos de amostra. O terceiro método proposto foi o de calibração dinâmica em vídeos televisivos de tênis de campo. O percentual de automatização na identificação das linhas e geração das matrizes homográficas foi de 99,98%. Os testes estáticos, variando ±2 pixels por pontos de calibração, mostraram erros de medição satisfatórios (2,26 cm). Os testes dinâmicos, no qual foram reprocessados 522 quadros usando de 4 a 8 pontos de calibração, também revelaram um erro de medição satisfatório (23 cm). O quarto método proposto foi o de rastreamento automático de jogadores de tênis em vídeos televisivos. A determinação da posição do jogador foi baseada na identificação da sub-região de maior correlação com o modelo do uniforme do jogador dada uma região de interesse (ROI) através do uso da matriz homográfica. O percentual de automatização foi de 99,62% e o tempo de processamento foi de 0,86 segundos por quadro processado. As incertezas (RMS) envolvidas na determinação da posição dos jogadores foram de aproximadamente 45 cm para o lado da quadra mais próxima à câmera e 64 cm para o lado da quadra mais afastada da câmera. As distâncias percorridas, velocidades e áreas de ocupação de ambos os jogadores foram calculadas como exemplo de aplicação do método. Em conclusão, a metodologia desenvolvida e aplicada ao tênis de campo em vídeos televisivos mostrou ser viável, com alto nível de automatização e erro de medição similar aos métodos baseados em câmera fixa
Abstract: The aim of this study is to propose a set of methods for tennis players motion analysis from pre calibrated video using fixed cameras as well as on broadcast tennis videos. First, it was proposed and validated a novel automatic method for tracking tennis players from precalibrated videos using two fixed cameras. The percentage of automatic tracking was 99.98%. The two-dimensional coordinates reconstruction of the tennis court was validated by calculating the intra-operator repeatability (0.009 m), inter-operator repeatability (0.007 m), relative error (0.03% length and 0.06% width). The accuracy reached for the player's position was 0.36 m. For both coordinates, the linear regression was significant (R2 > 0.99, p <0.05) from the positions obtained by automatic and manual tracking methods. The covered distance performed by the players during a set of a tennis match was calculated. The second proposed method was the automatic detection of rallies in broadcast tennis videos. The method developed was based on the histogram extraction, statistical filtering and key frame similarity comparison. Three videos of tennis matches representing three different court surfaces were used to evaluate the proposed method. The average hit rate of the scene cuts was 81%. The rallies duration obtained by the proposed method was valid whether compared with the manual annotation and suitable to determine the rally duration for all sample videos. The third proposed method was proposed a dynamic calibration (frame by frame) in broadcast tennis video based on the automatic tennis court lines intersections detection. The percentage of automation of lines intersections identification and homographic matrix generation was 99.98%. The static test, based on varying by ± 2 pixels the calibration points, revealed a satisfactory accuracy (2.26 cm). The dynamic test, which have been reprocessed 522 frames using 4-8 calibration points, also showed satisfactory accuracy (23 cm). The fourth method presented was the automatic tracking of tennis players on broadcast tennis videos. The identification of the players' position was based on the sub-region of higher correlation with the players' clothes model in a region of interest (ROI) constructed by using the homographic matrix. The percentage of automation was 99.62% and the processing time was 0.86 seconds per frame processed. The errors (RMS) involved in determining the position of the tennis players were about 45 cm to the side of the court closest from the camera and 64 cm to the side of the court farthest from the camera. The covered distances, velocities and occupancy areas for both players were automatically extracted. In conclusion, the proposed methods developed and applied on broadcast tennis videos revealed to be feasible, with a high level of automation and accuracy similar to methods based on fixed cameras
Mestrado
Biodinamica do Movimento e Esporte
Mestre em Educação Física
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Neto, Ludgero Braga. "Características dinâmicas e eletromiográficas do forehand e backhand em tenistas: uma perspectiva biomecânica para avaliar o desempenho". Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/39/39132/tde-11082008-113504/.

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Abstract (sommario):
O forehand e o backhand são as técnicas de movimentos mais utilizados no tênis. São golpes técnicos de complexa execução, pois dependem de uma perfeita sincronização temporal entre o movimento da raquete e a trajetória da bola. A literatura especializada demonstra que o posicionamento dos pés é fundamental para gerar potência nestes golpes e registra basicamente dois tipos de forehand quanto ao posicionamento dos pés: forehand open stance (FOS) e forehand square stance (FSS). A técnica de backhand, desde o início da prática da modalidade, apresenta duas maneiras de ser executada: com uma mão (BK1) ou com duas mãos (BK2) segurando o cabo da raquete. Pesquisas científicas específicas nesta modalidade esportiva têm se tornado razoavelmente freqüentes nas últimas duas décadas. O objetivo deste estudo é descrever as características biomecânicas a partir de parâmetros dinâmicos, cinemáticos e eletromiográficos segundo variáveis e músculos relacionados experimentalmente em função da utilização das quatro técnicas descritas acima. Através do conhecimento destas características biomecânicas, pretende-se ainda estabelecer uma relação de dependência quanto às influências no desempenho técnico esportivo. A amostra foi composta por dez indivíduos do sexo masculino, que possuíam domínio das técnicas analisadas. Ao analisarmos os resultados que reúnem as variáveis Biomecânicas estudadas, percebemos que é possível aceitar parcialmente a hipótese inicial de nosso estudo: as técnicas FOS e BK2 demandam maior ativação muscular quando comparadas com as técnicas FSS e BK1, respectivamente. Observando-se ainda os resultados de eletromiografia, verificamos a predominância de valores mais elevados de ativação muscular para as técnicas FOS e BK2 durante a fase pós-impacto, confirmando-se, portanto a hipótese inicial. Porém, durante a fase pré-impacto, os valores mais elevados de ativação muscular foram observados nas técnicas FSS e BK1, contrariando desta maneira a hipótese inicial. Concluímos, portanto, distintos comportamentos entre as duas técnicas de forehand e backhand, principalmente ao analisarmos as fases pré e pós-impacto, o que nos permitiu uma análise técnica detalhada dos gestos esportivos estudados, dada a complexidade estrutural dos mesmos
The forehand and the backhand are the most common movements in tennis. They are technical strokes of complex execution because they depend on perfect temporal synchronization between the racket\'s movement and the ball\'s trajectory. The tennis literature on the subject shows that the feet\'s positioning is crucial to generate power during these strokes. Two kinds of forehand are identified: the forehand open stance (FOS) and the forehand square stance (FSS). The backhand, since its origin, has appeared in two forms: the one-handed grip (BK1) and the two-handed grip (BK2). Scientific research on the subject has been conducted regularly during the two decades. Hence, the aim of this study is to describe the biomechanical characteristics within dynamic, kinematic and electromyographic parameters, and according to variables and experimentally related muscles in relation to the four different tennis techniques. In addition, through knowledge of these biomechanical characteristics, this thesis intends to identify the influences on technical sports performance. The sample was composed of males (n=10) that have mastery of the forehand and backhand strokes. After analyzing the results that evolve Biomechanics variables studied, we realized that it\'s possible to partially accept the initial hypothesis of our study: the forehand open stance and backhand strokes with both hands demand greater muscle activation when they are compared with forehand square stance and backhand stoke with just one hand, respectively. Still, observing the results of electromyography, we verified the predominance of the highest values of muscle activation for forehand open stance and backhand strokes with both hands during the post-impact phase, it\'s, thus, confirming the initial hypothesis. However, during the pre-impact phase, the highest values of muscle activation were observed in the forehand square stance and backhand strokes with one hand, counteracting, in this way, the initial hypothesis. We concluded, therefore, distinct behaviors between the two forehand and backhand strokes, mainly to analyze the pre and post-impact phase, which allowed us a detailed technical analysis of the sportive gestures studied, owing to its structural complexity
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Libri sul tema "Biomechanics of tennis"

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Ivancevic, Tijana T. Paradigm Shift for Future Tennis: The Art of Tennis Physiology, Biomechanics and Psychology. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011.

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1945-, Elliott Bruce, Reid Machar, Crespo Miguel e International Tennis Federation, a cura di. Biomechanics of advanced tennis. London: International Tennis Federation, 2003.

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Ivancevic, Tijana T., Bojan Jovanovic, Sasa Jovanovic, Milka Djukic, Natalia Djukic e Alexandar Lukman. Paradigm Shift for Future Tennis: The Art of Tennis Physiology, Biomechanics and Psychology. Springer, 2014.

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Ivancevic, Tijana T., Bojan Jovanovic e Sasa Jovanovic. Paradigm Shift for Future Tennis: The Art of Tennis Physiology, Biomechanics and Psychology. Springer, 2012.

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Biomechanical Principles of Tennis Technique: Using Science to Improve Your Strokes. Usrsa, 2006.

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Complex Sports Biodynamics With Practical Applications In Tennis. Springer, 2009.

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Science and Racket Sports I. Taylor & Francis Group, 2014.

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A, Lees, Kahn J. F. 1947-, Maynard I. W. 1956-, International Table Tennis Federation Sports Science Congress (8th : 2003 : Paris, France) e World Congress on Science and Racket Sports (3rd : 2003 : Paris, France), a cura di. Science and racket sports III. New York: Routledge, 2004.

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Lees, Adrian. Science and Racket Sports III: The Eighth International Table Tennis Federation Sports Science Congress and The Third World Congress of Science and Racket Sports. Routledge, 2004.

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1941-, Reilly Thomas, Hughes M, Lees A e World Congress on Science and Racket Sports (1st : 1993 : Runcorn, England), a cura di. Science and racket sports. London: E & FN Spon, 1995.

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Capitoli di libri sul tema "Biomechanics of tennis"

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Ivancevic, Tijana T., Bojan Jovanovic, Sasa Jovanovic, Milka Djukic, Natalia Djukic e Alexandar Lukman. "Modern Tennis Biomechanics". In Paradigm Shift for Future Tennis, 227–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-17095-9_22.

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Martin, Caroline. "Biomechanics of the Tennis Serve". In Tennis Medicine, 3–16. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-71498-1_1.

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Elliott, Bruce, Machar Reid e David Whiteside. "Biomechanics of Groundstrokes and Volleys". In Tennis Medicine, 17–42. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-71498-1_2.

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Knudson, Duane, e Bruce Elliott. "Biomechanics of Tennis Strokes". In Bioengineering, Mechanics, and Materials: Principles and Applications in Sports, 153–81. Boston, MA: Springer US, 2004. http://dx.doi.org/10.1007/978-1-4419-8887-4_7.

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Ivancevic, Tijana T., Bojan Jovanovic, Sasa Jovanovic, Milka Djukic, Natalia Djukic e Alexandar Lukman. "The Newton-Euler Biomechanics Law". In Paradigm Shift for Future Tennis, 71–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-17095-9_12.

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Ivancevic, Tijana T., Bojan Jovanovic, Sasa Jovanovic, Milka Djukic, Natalia Djukic e Alexandar Lukman. "The Law of Basic Biomechanics". In Paradigm Shift for Future Tennis, 27–33. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-17095-9_5.

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Nigg, B. M., S. M. Lüthi e A. Bahlsen. "Influence of Shoe Construction on the Supination During Sidewards Movement in Tennis Shoes". In Biomechanics: Current Interdisciplinary Research, 657–62. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-011-7432-9_99.

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Li, Fengling, Kelei Li e Jingjing Lv. "Research on Biomechanics Technology Based on the Tennis Sports". In Lecture Notes in Electrical Engineering, 415–20. London: Springer London, 2012. http://dx.doi.org/10.1007/978-1-4471-4790-9_53.

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Myers, Natalie L., e Duane Knudson. "Ergonomics and Biomechanics: Racquet Sensors for Monitoring Volume of Training and Competition in Tennis". In Biomechanical Principles and Applications in Sports, 3–16. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-13467-9_1.

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Elliott, Bruce C. "Tennis Strokes and Equipment". In Biomechanics of Sport, 263–88. CRC Press, 2020. http://dx.doi.org/10.1201/9781003068549-8.

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Atti di convegni sul tema "Biomechanics of tennis"

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Zhu, Zhiqiang. "Research on Sports Biomechanics Based on Tennis Serve Technique". In 2017 5th International Conference on Machinery, Materials and Computing Technology (ICMMCT 2017). Paris, France: Atlantis Press, 2017. http://dx.doi.org/10.2991/icmmct-17.2017.257.

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Mocanu, Mircea. "Optimization Of The Retopspin Performance Biomechanics In Female Juniors In Table Tennis". In ICPESK 2018 - International Congress of Physical Education, Sports and Kinetotherapy. Education and Sports Science in the 21st Century, Edition dedicated to the 95th anniversary of UNEFS. Cognitive-Crcs, 2019. http://dx.doi.org/10.15405/epsbs.2019.02.48.

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Irawan, Ricko, Agus Raharjo e Lulu Farida. "Developing Assessment Model of a Tennis Forehand Stroke as Biomechanics Movement Perspective". In Proceedings of the 5th International Seminar of Public Health and Education, ISPHE 2020, 22 July 2020, Universitas Negeri Semarang, Semarang, Indonesia. EAI, 2020. http://dx.doi.org/10.4108/eai.22-7-2020.2300305.

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Taylor, Rebecca E., Chunhua Zheng, Ryan P. Jackson, Joey C. Doll, Julia Chen, Katherine R. S. Holzbaur, Thor Besier e Ellen Kuhl. "Critical Loading During Serve: Modeling Stress-Induced Bone Growth in Performance Tennis Players". In ASME 2008 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2008. http://dx.doi.org/10.1115/sbc2008-192005.

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Abstract (sommario):
On September 27, 2004 Andy Roddick hit the current world record 155 mph serve in his Davis Cup match against Belarus, which set him up with three match points against Vladimir Voltchkov. By that time, at 22 years of age, Roddick had broken his own speed record for the third time. In tennis, like in almost all other high performance sports, professional athletes tend to reach their peak performance at a much younger age than they used to several decades ago. Accordingly, athletes have to start full-time practice in their early childhood that strongly overlaps with the period of skeletal and muscular development. It is the responsibility of their coaches and physicians to design efficient training programs targeted at maximal performance and minimal risk of injury. Biomechanics can play a crucial role in supporting the design of these training strategies. By predicting the functional adaptation of bones and muscles, biomechanics simulation can help to explain and eventually prevent common forms of injuries caused by chronic overuse.
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Shikulskaya, Olga, Dmitriy Anuriev, Mikhail Shikulskiy e Ruslan Ramozanov. "Research of Athletes’ Movements Biomechanics in Big Tennis Using Motion Capture Technology and Image Processing". In 2018 International Conference on Recent Innovations in Electrical, Electronics & Communication Engineering (ICRIEECE). IEEE, 2018. http://dx.doi.org/10.1109/icrieece44171.2018.9009360.

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Yan, Shaowen, Kunling Qin e Bing Zhang. "The biomechanical model table tennis ball smash mechanics characteristics". In 2016 National Convention on Sports Science of China, a cura di Z. Henan e J. Y. Beijing. Les Ulis, France: EDP Sciences, 2017. http://dx.doi.org/10.1051/ncssc/201701036.

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Ye, Xiangping, e Jihe Zhou. "Biomechanical Analysis of Uwanrs Serve Technology for Elite Tennis Athlete". In 2018 International Conference on Mathematics, Modelling, Simulation and Algorithms (MMSA 2018). Paris, France: Atlantis Press, 2018. http://dx.doi.org/10.2991/mmsa-18.2018.79.

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Velandia, Maria Paula, Maria Alejandra Lopez e Ruben Dario Hernández Beleño. "Sports Biomechanical Analysis For Rehabilitation Of Parkinson’S Disease Case Study Table Tennis". In The 19th LACCEI International Multi-Conference for Engineering, Education, and Technology: “Prospective and trends in technology and skills for sustainable social development” “Leveraging emerging technologies to construct the future”. Latin American and Caribbean Consortium of Engineering Institutions, 2021. http://dx.doi.org/10.18687/laccei2021.1.1.618.

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Feng Lin e Xiaotao Li. "Biomechanical analysis of shoulder and hip angle in tennis technique of two-handed backhand slap topspin". In 2011 International Symposium on Information Technology in Medicine and Education (ITME 2011). IEEE, 2011. http://dx.doi.org/10.1109/itime.2011.6130750.

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Fabbri, Giulia, Quan Long, Hao Gao, Carola Koenig, Michael W. Collins e Michele Pinelli. "Stress Analysis of Carotid Arterial Stenosis With 3-D Fluid-Structure Interaction Simulations". In ASME 2007 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2007. http://dx.doi.org/10.1115/sbc2007-176451.

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Atherosclerotic plaques may rupture without warning and cause subsequential acute syndromes such as myocardial infarction and cerebral stroke. Plaque disruption tends to occur at points where the plaque surface is weakest i.e. at points where biomechanical stresses caused by the pulsatile blood flow are concentrated. Therefore, both plaque vulnerability (intrinsic disease) and rupture triggers (extrinsic forces) are important for plaque disruption [1]. The former predisposes the plaque to rupture while the latter may precipitate it.
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