This study tested the hypothesis that grip and wrist strength affect performance on wall volley tests that were designed to test ability in tennis, badminton, and volleyball.

Este trabalho de pesquisa teve por objetivos: primeiro, descrever em termos cineantropométricos atletas de voleibol masculino de nível estadual, de acordo com as diferentes categorias competitivas - de mirim a principal - e verificar as relações existentes entre aspectos morfológicos e de desempenho motor; segundo, verificar o comportamento das variáveis cineantropométricas entre atletas pertencentes a diferentes categorias competitivas procurando determinar, na amostra estudada, quais variáveis devem ser consideradas como mais importantes no período compreendido entre uma categoria inferior e outra imediatamente superior; e terceiro, comparar quatro possibilidades de métodos que possam ser utilizados na classificação dos atletas nas diferentes categorias competitivas, respectivamente: a) classificação subjetiva do treinador; b) classificação através da utilização do escore padrão Z; c) classificação através do coeficiente de classificação por médias; d) classificação através de análise dos componentes principais, os quais possam auxiliar mais efetivamente o processo de seleção e promoção de talentos esportivos para o voleibol. Para isso, uma amostra de 75 atletas de voleibol masculino, na faixa etária de 13 a 28 anos, distribuídos entre as diversas categorias competitivas, foi avaliada em termos cineantropométricos conforme variáveis consideradas relevantes para a prática do voleibol de alto nível. Foi possível concluir que: 1) os atletas avaliados apresentaram valores cineantropométricos próximos e/ou superiores aos esperados para atletas de voleibol de nível competitivo nas medidas realizadas, indicando o bom nível dos atletas envolvidos no estudo; 2) existem importâncias diferentes para as variáveis na passagem de uma categoria inferior para outra imediatamente superior; 3) o coeficiente de classificação por médias, neste estudo, parece indicar que análises multivariadas podem adequar-se mais fielmente à resolução da complexidade que envolve os processos de promoção de talentos / This work of has several arms: first, to describe in kinanthropometrics terms top level male volleyball athletes at São Paulo State in different competitive categories - from minor to major and verify the existence of relationships among morphological aspects and motor performances; second, to verify the behavior of kinanthropometrics variables among athletes belonging to different competitive categories. The goal here is trying to determine how variables should be ranked in importance to define performance and how this ranking changes as we go from one stage to the next one; third, to compare four possibilities of procedures that may be used on the athletes ranking in different competitive stages namely: a) coachs subjective classification; b) classification using the standard Z score; c) classification using the coefficient derived by means; d) classification using the analysis of principal components. One tries to point out the ones which more effectively may cooperate in the process of selection and promotion of talent to volleyball. In order to make the comparison, a sample of 75 male volleyball athletes between the ages of 13 and 28 years old, divided among all the different competitive categories were evaluated in kinanthropometric terms by using the variables considered important to the practice of high level volleyball. It was possible to conclude that, 1) the evaluated athletes presented kinanthropometrics values close and/or superior to the expected for high competitive level male volleyball athletes in the variables measured, showing the good level of the athletes involved in the study; 2) there are differences in the importance of the variables in the passage from a lower stage to the following next ; 3) the coefficient of classification by means in this study seems to indicate that the multivariate analysis is more adequate to give better understanding of the complexity that involves the process of talent promotion

A multiple baseline across behaviors design was used to test the effectiveness of a treatment package involving the use of a videotape recorder to improve the performance of college women volleyball players. The subjects were four highly skilled athletes, as evidenced by thei.r participation in the University of the Pacific volleyball program, ranked second nationally during the 1980-81 season. The treatment package consisted of the following: (a) zooming in with a video camera on particular aspects of the players' performances; (b) attempts to change only one aspect of the performance of a skill rather than the entire skill; (c) cueing and corrective feedback provided by the coach during the players' viewing of the resulting videotapes; (d) the players immediately correcting their errors in performance after viewing the videotapes and (e) multiple viewings by the players of videotapes of their correct performances of the volleyball skills. The results indicated that all of the subjects benefited from the videotape treatment package. Two of the players showed improvement in the two volleyball skills for which the treatment was given. The other two players showed improvement in one of the two volleyball skills for which the treatment was given. For three of the four players their improved practice performances with the videotape treatment also resulted in improved performances during scrimmages for at least one of the two target behaviors.

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The aim of this diploma thesis is to evaluate the direct dependence of the match outcome on the success of players in individual positions, moreover, the thesis also examines whether it is possible for an individual's performance to influence the outcome. This will show which playing positions and their activities are most important for the development and outcome of the match. Furthermore, this work will compare the results of male and female category and explain the difference in these categories. For the practical part, a statistical method has been created, by which the necessary data were gathered during the matches of Dobřichovice women's and men's first league teams. The collected data for each category were then evaluated, the categories were compared with each other and conclusions were drawn. The acquired data from this diploma thesis could subsequently help with creating training units in the training process. By composing this thesis, the author has verified a multitude of information gained through her volleyball practice. Key words: volleyball, player, position, success rate

Title: Study of satisfaction of Czech beachvolleyball championship participants compared to analogous foreign tournaments Aims: The main aim of this diploma thesis is to determine satisfaction of beach volleyball players with the Czech beachvolleyball championship in Opava 2020 in comparation with foreign tournaments. Following these results recommendations and advice for improvement of the Czech beachvolleyball championship are proposed. Methodology: The main methods used in this thesis are electronic questionnaires and semi- structured interviews. Creation of the questionnaire was inspired by the SERVIMPERF method and Brady's model. The questionnaire was investigating 26 attributes overall. The data set consists of players from Czech's beach volleyball's national team. Interviews were conducted with two national team players, and the aim was primarily to add to the information obtained from the electronic questionnaires. Results: The obtained data is interpretated via graphs, mostly by cross-tab classification and tables. These data showed that the players were not content with the vast majority of investigated attributes of the 2020 Czech beachvolleyball championships. Comparatively, the foreign tournaments are in most of the attributes satisfying. In the resulting comparison the foreign...

In this study, inertial measurement units (IMUs) were used to train a random forest classifier to correctly classify different jump types in volleyball. Athlete motion data were collected in a controlled setting using three IMUs, one on the waist and one on each ankle. There were 11 participants who at the time played volleyball at the collegiate level in the United States, seven male and four female. Each performed the same number of jumps across the eight jump types--five BASIC jumps and three each of the other seven--resulting in 26 jumps per subject for a total of 286. The data were processed using a max-bin method and trained using a leave-one-out cross-validation method to produce a classifier that can determine jump type with an accuracy of 0.967, as measured by an F1-score.

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