El objetivo de la investigación fue conocer las variables de recepción que predecían su eficacia, en diferentes niveles de juego (U-21, absoluto) en voleibol masculino. La muestra del estudio estuvo ...compuesta 3442 acciones de recepción, de las cuales 1894 corresponden a categoría U-21 (U-21 Men´s World Championship) y 1548 a categoría absoluta (Absolute Men´s World Championship). Las variables del estudio fueron: función del receptor, desplazamiento previo del receptor, tipo de recepción, posición del receptor, técnica de recepción, zona de recepción, eficacia de recepción. El análisis de regresión logística multinomial mostró que, el desplazamiento previo del receptor y la técnica de recepción fueron predictoras en ambas categorías, U-21 y absoluta; el tipo de recepción y zona de recepción fueron predictoras únicamente en U-21; la posición del receptor fue predictora únicamente en absoluta. Dicha información puede ayudar al proceso de entrenamiento favoreciendo el diseño de tareas concretas para cada nivel de juego.
Este estudo teve como objetivo comparar os tempos de rally e o padrao de complexos e de açöes realizados no voleibol profissional e escolar sub-19. Foram avaliados um jogo de voleibol masculino e ...feminino da Superliga Brasileira (voleibol profissional) e um jogo de uma equipa dos Jogos dos Institutos Federais (voleibol escolar sub-19) por meio do software AdobeePremiereePro e analisou-se os tempos de rallies e seus intervalos, a percentagem (%) da densidade, os tipos e números de complexos e das açöes nos rallies, além do ponto obtido no rally. Nos jogos de voleibol escolar sub-19 e feminino exibiram maiores tempo de rally e % da densidade, reduzindo o tempo de recuperaçao. No jogo de voleibol escolar sub-19 realizou-se um maior número de complexos no rally que o profissional. Os complexos com 3 e 1 açöes foram os mais executados e exibiram maior ocorrěncia de pontos. O escalao dos sub-19 mostrou uma maior ocorrěncia de pontos por meio de erros de fundamentos (bloqueio, defesa e ataque), já nos jogos profissionais ocorreram mais pontos de ataque. Erros de serviço na superliga masculina foram mais relevantes que nas demais categorias. Conclui-se que o voleibol escolar sub-19 difere do profissional nos tempos de rallies e padröes dos complexos e açöes, devido a menor experiencia no desporto.
This observational study aimed to evaluate the intra- and inter-operator reliability of a digital palpation device in measuring compressive stiffness of the patellar tendon at different knee angles ...in talent and elite volleyball players. Second aim was to examine differences in reliability when measuring at different knee angles, between dominant and non-dominant knees, between sexes, and with age. Two operators measured stiffness at the midpoint of the patellar tendon in 45 Dutch volleyball players at 0°, 45° and 90° knee flexion, on both the dominant and non-dominant side. We found excellent intra-operator reliability (ICC>0.979). For inter-operator reliability, significant differences were found in stiffness measured between operators (p<0.007). The coefficient of variance significantly decreased with increasing knee flexion (2.27% at 0°, 1.65% at 45° and 1.20% at 90°, p<0.001). In conclusion, the device appeared to be reliable when measuring compressive stiffness of the patellar tendon in elite volleyball players, especially at 90° knee flexion. Inter-operator reliability appeared to be questionable. More standardized positioning and measurement protocols seem necessary.This observational study aimed to evaluate the intra- and inter-operator reliability of a digital palpation device in measuring compressive stiffness of the patellar tendon at different knee angles in talent and elite volleyball players. Second aim was to examine differences in reliability when measuring at different knee angles, between dominant and non-dominant knees, between sexes, and with age. Two operators measured stiffness at the midpoint of the patellar tendon in 45 Dutch volleyball players at 0°, 45° and 90° knee flexion, on both the dominant and non-dominant side. We found excellent intra-operator reliability (ICC>0.979). For inter-operator reliability, significant differences were found in stiffness measured between operators (p<0.007). The coefficient of variance significantly decreased with increasing knee flexion (2.27% at 0°, 1.65% at 45° and 1.20% at 90°, p<0.001). In conclusion, the device appeared to be reliable when measuring compressive stiffness of the patellar tendon in elite volleyball players, especially at 90° knee flexion. Inter-operator reliability appeared to be questionable. More standardized positioning and measurement protocols seem necessary.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
El objetivo del estudio fue diseñar, validar y testar la fiabilidad de un instrumento de observación para analizar el comportamiento táctico en un partido de mini voleibol. La herramienta recoge ...información sobre aspectos del sistema de juego en la modalidad de 4x4. Para el proceso de diseño, inicialmente se realizó una revisión bibliográfica para establecer los criterios de observación. La validez de contenido se estableció a nivel cualitativo (grado de comprensión y adecuación en la redacción, y pertinencia de las preguntas) y cuantitativo (valoración global, escala 0 a 10), a través del acuerdo y consenso de diez jueces expertos. Todos los ítems del instrumento tuvieron una valoración por encima de .7 en el coeficiente V de Aiken. Posteriormente se realizó una prueba de fiabilidad intra e inter observadores, mediante un estudio piloto. A partir de los resultados obtenidos se puede establecer que el instrumento creado dispone de la validez y fiabilidad suficiente para evaluar el comportamiento táctico del equipo durante el juego en la iniciación al voleibol. El instrumento diseñado puede ser una herramienta útil para entrenadores, ya que es fácil de cumplimentar y adaptado a el nivel de juego de alguien que se está iniciando a este deporte.
El objetivo del presente estudio fue conocer la influencia del comportamiento visual (localización, número y duración de las fijaciones visuales) sobre la toma de decisiones en la acción del bloqueo ...en voleibol. Se analizó el comportamiento visual de 38 jugadoras de voleibol (23.9 ± 4.2 años), que competían de manera federada, mediante el sistema de registro de movimientos oculares (Mobile Eye) durante la visualización de secuencias de video proyectadas a tamaño real. Los modelos de regresión obtenidos muestran que se obtienen mayores porcentajes de acierto cuando la duración de las fijaciones es reducida en las zonas HC y CB, y cuando aumenta el número de fijaciones en la zona BM y disminuye en la zona CB.
The aim of this study was the assessment and comparison of the setting zone choices by male and female elite setters, in relation to the quality of the defensive actions which were carried out in ...Complex II (KII) and III (KIII). A three-member group of coaches assessed the actions of male (M) and female (F) setters and defenders from 20 volleyball games (M=10, F=10) of National Teams competing in the final phase of the World League 2017. The assessment was based on a 5-point rating scale and included actions that composed a set of 2 contacts in KII and KIII. The test of independence for the variables (“setting zones”, “defense quality”) was carried out using Fisher’s exact test. Following the overall independence test we tested the difference in proportions between genders for each level of the “setting zone” variable. Results showed that in KII the differences in proportions between genders for each level of the “setting zone” variable were found for zone 4 in favor of the male and zones 2 and 6 in favor of the female players. In KIII and under excellent defensive actions the difference in proportions between genders was found in zones 1 and 6 in favor of the males. In conclusion, under suboptimal and optimal conditions, male setters set the ball to zones 4, 6 and 1 more frequently than females, incorporating them into their offensive strategy, while the latter under good conditions preferred setting to zones 2 and 6.
In elite volleyball, previous studies revealed some patterns in male technical actions. The opposite is the most scorer player, middle blockers are the most efficient players in the block action, ...while outside hitters -- to winning points in a high level -- require perfect receptions, fast attack tempo and powerfully executed attacks. The purpose of this study was to compare different technical actions between the top 4 Portuguese volleyball teams and top 4 Golden European League. The study included the top 4 teams participating in the European Volleyball Golden League in 2018 and the top 4 teams participating in the Portuguese Volleyball League. We analyzed 8 outside hitters, 8 middle blockers and 4 opposite players from each league (total of 40 players). This study analyzed a total of 430 technical actions (attack efficacy of the opposite - 109 actions -, block efficiency of the middle blockers -- 155 actions -- and receptions efficacy of the outside hitters -- 166 actions).
Volleyball is a non-invasive net sport. Teams perform alternative high-intensity actions of passing a ball and trying to send it to the opponent's court. Traditionally, monitoring players' jumping ...ability in a competition involves the assessment of the types and the number of jumps that the players perform. Previous studies showed that players' game demands changed according to the players' positions and their specificity. The purpose of this pilot study was to assess the types and intensities of the jumps (that professional male volleyball players executed according to particular playing positions. The purpose of this pilot study was to assess the types and intensity of the jumps of outside hitters and middle blockers in the senior 1st division of volleyball in Portugal. The results confirm the need to individualize the practice and training of volleyball players according to the players' roles. More studies are needed to provide more information about repeated jump ability in volleyball players.
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