Orientadores: Caroline Dário Capitani, Marcelo Saldanha Aoki / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Ciências Aplicadas / Made available in DSpace on 2018-08-27T04:18:29Z (GMT). No. of bitstreams: 1 Cunha_VivianCostaResende_M.pdf: 1876869 bytes, checksum: ae33265fb59060e2348349bf854e1379 (MD5) Previous issue date: 2014 / Resumo: O presente estudo teve os seguintes objetivos: caracterizar as demandas fisiológicas de diferentes rotinas de treinamento e, avaliar o efeito da suplementação de citrato de sódio sobre o desempenho de habilidades específicas do Tênis após uma simulação de partida. Dez jogadores de Tênis juvenis, do sexo masculino (17,0 ± 1,2 anos; estatura: 176,7 ± 5,2 cm; peso: 68,4 ± 7,9 kg; gordura corporal: 11,7 ± 1,4%) participaram dos estudos. No primeiro estudo foram realizadas quatro rotinas de treinamento, cada qual com seis pontos. As rotinas se diferiram entre si pelo número de rebatidas por ponto (duas, quatro, sete e dez rebatidas por ponto). Foram avaliados frequência cardíaca (FC), percepção subjetiva de esforço (PSE) e concentração de lactato ([La]) após o primeiro, terceiro e sexto ponto de cada rotina. O segundo estudo consistiu na suplementação de citrato de sódio (0,5 g.kg-1 de peso) ou placebo - NaCl (0,1 g.kg-1 de peso). Após 120 minutos da ingestão do suplemento, foram realizados testes de habilidades específicas no Tênis (Loughborough Tennis Skill Test ¿ LTST e Repeated Sprint Ability Shuttle Test ¿ RSA) antes e após a simulação de uma partida de 60 minutos. Observou-se que todos os parâmetros avaliados no primeiro estudo (FC, PSE e [La]) aumentaram progressivamente durante as rotinas de treinamento, à medida que se aumentava o número de rebatidas por ponto, indicando que rotinas de treinamento com sete e dez rebatidas por ponto induziram respostas maiores associadas ao nível de estresse do que observado nas rotinas mais curtas. No segundo estudo observou-se aumento significante (p<0,05) da [HCO3-] e do excesso de base no grupo suplementado com citrato de sódio comparado ao placebo. Após a simulação de partida houve aumento da [La] e de pH no grupo suplementado com citrato de sódio ([La]: 5,46 mmol.L-1; pH: 7,48) comparado ao grupo placebo ([La]: 2,28 mmol.L-1; pH: 7,34). A capacidade de sprints repetidos avaliada pelo RSA não apresentou diferença (p>0,05) entre os testes pré e pós simulação de partida. Apesar do total de golpes desenvolvidos pelos jogadores não apresentarem diferença significante (p>0,05) antes e após a simulação de partida, observou-se declínio (p<0,05) na consistência dos golpes para o grupo placebo (pré: 53,5%; pós: 40,4%) quando comparado ao grupo suplementado com citrato de sódio (pré: 50,2%; pós: 58,5%). Portanto, sugere-se que a suplementação de citrato de sódio pode prevenir o declínio do desempenho das habilidades específicas do Tênis, após uma simulação de partida / Abstract: This study had the following objectives: To characterize the physiological demands of different training routines and evaluate the effect of sodium citrate supplementation on the performance of specific tennis skills after a simulated match. Ten young male tennis players (17,0 ± 1,2 years old; height: 176,7 ± 5,2 cm; weight: 68,4 ± 7,9 kg; body fat: 11,7 ± 1,4%) participated in the studies. In the first study, four training routines were performed, each with six points. The routines differed according to the number of hits per point (two, four, seven and ten hits per point). Heart rate (HR), rating of perceived exertion (RPE) and blood lactate concentration ([La]) were assessed after the first, third and sixth points of each routine. The second study consisted of supplementing with sodium citrate (0,5 g.kg-1 body weight) or placebo - NaCl (0,1 g.kg-1 wt). One-hundred and twenty minutes after taking the supplement, tests were performed for specific tennis skills (Loughborough Tennis Skill Test - LTST and Repeated Sprint Ability Test Shuttle - RSA) before and after simulating a match of 60 minutes. All parameters evaluated in the first study (HR, RPE and [La]) were found to increase progressively during training routines, as the number of hits per point increased, indicating that training routines with seven and ten hits per point were associated with higher levels of stress than for the shorter routines. The second study demonstrated a significant increase (p <0,05) in [HCO3-] and base excess in the group supplemented with sodium citrate, compared with placebo. After the match simulation, increases were observed in [La] and pH in the group supplemented with sodium citrate ([La]: 5,46 mmol.L-1; pH: 7,4), compared to the placebo group ([La]: 2,28 mmol.L-1; pH: 7,34). The ability to repeat sprints, as evaluated by RSA, did not differ (p > 0,05) between the pre and post match simulation. Although the total number of hits performed by the players was not significantly different (p>0,05) before and after starting the simulation, we observed a decrease (p<0,05) in the consistency of the hits in the placebo group (pre: 53,5%; post: 40,4%), when compared to the group supplemented with sodium citrate (pre: 50,2%; post: 58,5%). Therefore, we suggest that supplementation of sodium citrate may prevent the decline in performance of specific tennis skills after a simulated match / Mestrado / Nutrição / Mestra em Ciências da Nutrição e do Esporte e Metabolismo

Title: Kinematic Analysis of Tennis Serve. Objectives: To evaluate tennis serve realization in the selected performance category, to review speed of particular serve types and define the differences. To create detailed movement analysis of the slice serve from the right side of the court and set up a trajectory of the centre of gravity. Methods: Case study using kinematic 2D and 3D analysis was made. Results: We found out that the flat serve is the fastest type of serve. There are differences in the body centre of gravity trajectory by comparison with elite tennis players. We also found out that serving from the right side of the court is being hit higher, than from the left side. We assume there is a very close connection between serve speed and the point of impact. Keywords: tennis, serve, kinematic analysis, 2D, 3D

Title: Analysis of the tennis match with emphasis on psychical factors. Objectives: The main goals of this paper is to assess whether mental states can affect the performance of the player during a tennis match. Method: The basic method will be used method of direct observation of players in the game situations with tennis match statistics. Results: Based on the analysis of the match was prepared curve of performance, which made it possible to compare the course of performance for both players. During the observation, external manifestations of behavior were recorded, which were reflected in the further development of the match. Keywords: tennis, tennis psychology, psychical states

Title: Testing and evaluation of game performance in tennis. Objectives: The aim of this thesis is to compare a standardized international ITN test and a practice match. Methods: In this thesis, qualitative and quantitative methods are used for data collection. The interviewing was done by semi-structured interview. The results are systematically arranged and tabulated for better understanding of the thesis. The process of testing the game performance is examined by observation. The comparative method was used to compare the measured results when testing the standardized international ITN test and the modified practice match (singles). Results: The values measured during testing were processed and compared. The results obtained show two testing stages that took place on four different days. Three categories were tested, where each category consisted of two probands (players) representing different tennis levels. Based on the data obtained, we can compare the relationships between the probands' estimates and the actual results. Keywords: tennis, game performance, ITN test

Return temporal anticipation on the basis of the ball trajectory estimation Abstract Ball-hitting in tennis involves spatio-temporal information about the ball's flight trajectory. We have focused on the temporal part of the information during returning a tennis serve that was simulated by a ball machine. The tested people had occlusion glasses placed on their head, which occluded their vision at the exact time, when the ball was being sent from the ball machine. The tested person did not know which part of the ball flight trajectory would be occluded, nor the ball speed. We examined the effect of part ball flight trajectory occlusion on the correct return timing of the ball. The analysis revealed that the greatest problems occurred while the second third of the ball flight trajectory had been occluded and reached most temporal errors at that time. Keywords: tennis, anticipation, ball flight trajectory, return stroke, occlusion glasses

Title: Analysis of the Tennis Serve from the perspective of the receiving player Objectives: To determine whether it is possible for the receiving opponent to estimate the direction and type of tennis serve based on the server's toss. Methods: The indirect method was used in the form of video surveillance to meet the objectives. The analyzed group consisted of five professional tennis players, who were exposed to the research model game situation. All five servers were recorded by a high speed camera in the area of the receiving player; radar was used to measure the ball speed. The key point for evaluation was the moment of release of the ball from the server's hand, the highest reached point of the ball and the moment when the ball was hit by the racket. The analyzed results were presented in the form of tables and graphs; from the statistical methods, the arithmetic average was used mainly. Results: This research focused on anticipating the tennis serve from the perspective of the receiving player. Overall, we observed five players, who served first from the right side and then the left side into the dedicated opponent's receiving area marked by lines. We established a research question whether it is possible to estimate the direction and type of serve based on the server's toss. When comparing...

Introduction: Question of femoroacetabular impingement is very actual. This young concept brings mechanism which leads to early degenerative changes of the hip joint of young and active individuals (athletes). Objectives: To review influence of sport activity on condition of the hip joint of young athletes (players of table tennis) and to determine incidence of femoroacetabular impingement and its clinical significance. Methods: We performed ultrasound and clinical examination and questionnaire with 22 individuals from 2 training groups. Groups vary in age, height, weight, volume of sport activity and how long they do sports. We found out incidence of cam-type impingement and evaluated pain of anterior impingement test, ranges of motions of the hip joint and deep squat. Results: Cam impingement was found in 27 hip joints, 16 in older group, 11 in younger one. In older group there were 12 from 16 impingements painful during anterior impingement test, 4 from 11 in younger one. In older group there were 4 symptomatic individuals, none in younger one. Older group has lower ranges of motion of flexion and internal rotation. 4 individuals did not perform deep squat, all of them with bilateral cam-type impingement. Conclusion: Femoracetabular impingement is frequent among young athletes. It causes...

Title: Assessment of the timing of tennis strokes using kinematic analysis and surface electromyography Aims: Assess the timing of tennis forhand, service and appropriate training exercises using kinematic analysis. Describe the activation of muscles in time for the chosen execution of the strokes by recording surface electromyography (SEMG). Compare the results of various executions and describe the differences between using the racquets with different parameters and between executions of various training exercises. Method: Case study using kinematic analysis and surface electromyography was made. Results: We have found out that the execution of the strokes using the players own racquet was the most stable. We have found the differences in timing while using various racquets. The heavier the equipment we are using in training exercise is the more different is the timing of this movement. We concluded that the chosen training exercises are inappropriate as the special exercises to improve coordination. Key words: tennis, timing, service, forhand, electromyographic analysis, kinematic analysis

Title: Dynamic warm-up race for tennis players Subject: Male and female tennis players from tennis club Tj Lokomotiva Plzen Objective: Compare immediate influence of static and dynamic stretching on performance level during particular movement tests using device Myotest PRO Methods: To meet the objective quantitative comparison was used by performance parameters using load accelerometer. Quantitative stress parameters were evaluated for individual tests as the mean value from a large amount of repetition in individually evaluation. Results: Tests proved it is not possible to confirm acute positive influence of dynamic stretching on all assesed parameters in different tests. In terms of average values of different tests a noticeable lower limbs improvement has been emerged at two out of three tests. Keywords: dynamic stretching, warm up, sport, injuries, regeneration, tennis

Titel: Preparation for beginning to be active in professional tennis Goals: Goal of my work is to analyze general preparation for children to start actively in performance tennis, are conditioning, technique, tactics, and physiological preparation. Method: For being successful of the assigned tasks, we used diagnostic methods and processed the following analysis of their data in fitness, technique training, tactics, and physiological preparation. Results: They compare general preparations of baby tennis players and show diagnostics while working with children. Key words: Tennis, babytennis, condition, technique, tactics, mentally.