Analyzing the psychological variables linked to performance in beach volleyball: an integrative review and practical recommendations / Análisis de las variables psicológicas vinculadas al rendimiento en voleibol playa: una revisión integradora y recomendaciones prácticas / Análise das variáveis psicológicas ligadas ao desempenho no voleibol de praia: uma revisão integrativa e recomendações práticas

Beach volleyball is an important team sport in which physical, technical, tactical,and psychological/social aspects are fundamental to sporting performance. However, this is the first review to analyse scientific production on psychological variables in beach volleyball. This is an integrative review in which a systematic search was carried out in five electronic databases (PubMed/MEDLINE, SPORTDiscus/EBSCO, SciELO, Scopus and BIREME) until September 2022. The terms used were "beach volleyball" OR "voleibolde praia" OR "vôlei de praia". In addition, the search included research with athletes, acute and chronic outcomes, and studies of various methods (e.g.,experimental, observational) involving psychological variables. The initial search identified 652 articles, and after the manual search and application of the inclusion criteria, 18 studies were integrated into a final synthesis.Most of the studies were published between 2011 and 2022 (n= 14; 77.78%). Observational design was the main method used (n= 10; 55.56%). The studies were grouped into nine major topics for synthesis: stress situation, activation levels, concentration, goal orientation and motivation, mental fatigue and performance, anxiety,and performance, discouraging environments, relationships between team members, coping strategies. In general, social relationships and self-control appear significant for performance; thus,coaches must serve as role models for players and sports psychologists can aid in monitoring psychological variables, team dynamics, and develop psychological skills.(AU)

El vóleyplaya es un importante deporte de equipo en el que los aspectos físicos, técnicos, tácticos y psicológicos/sociales son fundamentales para el rendimiento deportivo. Sin embargo, esta es la primera revisión que analiza la producción científica sobre variables psicológicas en vóleyplaya. Se trata de una revisión integradora en la que se realizó una búsqueda sistemática en cinco bases de datos electrónicas (PubMed/MEDLINE, SPORTDiscus/EBSCO, SciELO, Scopus y BIREME) hasta septiembre de 2022. Los términos utilizados fueron "beach volleyball" OR "voleibol de praia" OR "vôlei de praia". Además, la búsqueda incluyó investigaciones con atletas, intervenciones agudas y crónicas, estudios de diversos métodos (e.g., experimentales, observacionales) que implicaran variables psicológicas. La búsqueda inicial identificó 652 artículos y, después de la búsqueda manual y la aplicación de los criterios de inclusión, 18 estudios se integraron en una síntesis final. La mayoría de los estudios fueron publicados entre 2011 y 2022 (n= 14; 77.78%). El diseño observacional fue el principal método utilizado (n= 10; 55.56%). Los estudios se agruparon en nueve grandes temas para la síntesis: situación de estrés, niveles de activación, concentración, orientación a objetivos y motivación, fatiga mental y rendimiento, ansiedad y rendimiento, entornos desalentadores, relaciones entre los miembros del equipo, estrategias de afrontamiento. Las relaciones sociales y el autocontrol parecen ser importantes para el rendimiento, por lo quelos entrenadores deben comportarse como modelos para los deportistas. Además, los psicólogosdeportivos pueden ayudar a controlar las variables psicológicas, la dinámica del equipo y a desarrollar habilidades psicológicas.(AU)

O voleibol de praia é um importante esporte coletivo em que aspectos físicos, técnicos, táticos e psicológicos/sociais são fundamentais para o desempenho esportivo. No entanto, esta é a primeira revisão que teve como objetivo analisar a produção científica sobre variáveis psicológicas no voleibol de praia. Essa é uma revisão integrativa em que foi realizada uma busca em cinco bases de dados eletrônicas (PubMed/MEDLINE, SPORTDiscus/EBSCO, SciELO, Scopus e BIREME) até setembro de 2022, de forma sistemática. Os temos usados foram “beach volleyball” OU “voleibol de praia” OU “vôlei de praia”. Além disso, foram incluídos nessa busca pesquisas com atletas, intervenções agudas e crônicas, estudos de vários métodos (e.g., experimental, observacional) que envolviam variáveis psicológicas. A busca inicial identificou 652 artigos, após a busca manual e aplicação dos critérios de inclusão, 18 estudos foram integrados a uma síntese final. A maioria dos estudos foi publicada entre 2011 e 2022 (n= 14; 77.78%). O desenho observacional foi o principal método utilizado (n= 10; 55.56%). Os estudos foram agrupados em nove grandes tópicos para síntese: situação de estresse, níveis de ativação, concentração, orientação para metas e motivação, fadiga mental e desempenho, ansiedade e desempenho, ambientes desanimadores, relacionamento entre as partes da equipe, estratégias de enfrentamento. As relações sociais e o autocontrole parecem importantes para o desempenho, portanto treinadores devem se comporta como modelo para os atletas. Além disso, psicólogos do esporte podem ajudar a monitorizar as variáveis psicológicas, na dinâmica da equipa e desenvolver de competências psicológicas.(AU)

Analysis of velocity- and power-load relationships of the free-weight back-squat and hexagonal bar deadlift exercises.

The aim of this study was to analyse the load-velocity and load-power relationships in the free-weight back-squat (BSQ) and hexagonal bar deadlift (HBD) exercises. Twenty-five (n = 25) resistance-trained men (age = 23.7 ± 2.8 years) performed a progressive load test at maximal intended velocity to determine their BSQ and HBD one-repetition maximum (1RM). Mean propulsive velocity (MPV) during the concentric phase of the lift was recorded through a linear encoder. Load-velocity and load-power relationships were analysed by fitting linear regression and the second-order polynomial, respectively, to the data. Maximum strength (1RM), MPV (30-80% 1RM), and power output (30-90% 1RM) were higher for HBD compared to BSQ exercise (p < 0.05). A very strong relationship between MPV and relative intensity was found for both BSQ (R2 = 0.963) and HBD (R2 = 0.967) exercises. The load that maximizes power output (Pmax) was 64.6 ± 2.9% (BSQ) and 59.6 ± 1.1% (HBD) 1RM. There was a range of loads at which power output was not different than Pmax (BSQ: 40-80% 1RM; HBD: 50-70% 1RM). In conclusion, the load-velocity and load-power relationships might assist strength and conditioning coaches to monitor and prescribe exercise intensity in the BSQ and HBD exercises using the velocity-based training approach.

Short-Term Effects of Repeated-Sprint Training on Vertical Jump Ability and Aerobic Fitness in Collegiate Volleyball Players During Pre-Season.

The aim of this study was to assess the effect of repeated-sprint training (RST) on vertical jump ability and aerobic power in college volleyball players. Nineteen male volleyball players, aged between 18-24 years, were randomized into the RST group (RST; n = 10) and control group (CG; n = 9). The RST included 2-3 sets of 6×30m all-out sprints, twice per week, in addition to the regular training routine. The control group performed only the regular volleyball training sessions (i.e. mainly of technical-tactical drills). All players performed a maximal graded treadmill test, vertical countermovement jump (CMJ), and repeated-vertical jump ability (RVJA) test before and after 6-weeks of the training program. The following variables were determined from the RVJA: peak (RVJApeak), average (RVJAmean), and rate of decrement (RVJADec). A two-way ANOVA with repeated measures showed an interaction effect on CMJ (F (1,17) = 6.92; p = 0.018; η 2 = 0.289), RVJApeak (F (1,17) = 4.92; p = 0.040; η 2 = 0.225), maximal oxygen uptake (F (1,17) = 9.29; p = 0.007; η 2 = 0.353) and maximal speed attained in the treadmill test (F (1,17) = 8.66; p = 0.009; η 2 = 0.337), with significant improvements only on the RST group. In conclusion, RST, twice per week, improved RVJA and aerobic power in comparison to regular skill-based volleyball training.

Monitoring Heart Rate Variability and Perceived Well-Being in Brazilian Elite Beach Volleyball Players: A Single-Tournament Pilot Study.

ABSTRACT: Nakamura, FY, Torres, VBC, da Silva, LS, Gantois, P, Andrade, AD, Ribeiro, ALB, Brasileiro-Santos, MdS, and Batista, GR. Monitoring heart rate variability and perceived well-being in Brazilian elite beach volleyball players: A single-tournament pilot study. J Strength Cond Res 36(6): 1708-1714, 2022-The aim of this study was to monitor the changes in heart rate variability (HRV) and perceptual well-being status after a beach volleyball (BV) tournament day in high-level U17 and senior players. Seventeen BV players (U17 [15-16 years]: n = 08; and senior [19-41 years]: n = 09) competing at national and/or international BV level participated in this study. Resting HRV and perceptual well-being measures were recorded across 4 moments: night 1 (prematches night), morning 1 (prematches morning), night 2 (postmatches night), and morning 2 (postmatches morning). Session rating of perceived exertion was assessed 10 minutes after each match, and accumulated match loads were used for analysis. Senior players presented higher values of natural logarithm of square root of the mean squared differences of successive RR intervals (lnRMSSD) at the 4 observation moments than U17 players (p = 0.006). Within-subjects analysis showed a larger mean difference regarding both lnRMSSD and natural logarithm SD of normal R-R intervals (lnSDNN) between night 1 vs. night 2 in U17 players (effect size = 1.11 and, 0.96, respectively) compared with senior (effect size = 0.40 and 0.32, respectively). Accumulated match loads were negatively correlated with percentage change in lnRMSSD (r = -0.54; p = 0.037). U17 players showed higher well-being variation than senior (group × time; p = 0.02). In conclusion, the lnRMSSD index was able to discriminate the U17 and senior BV players, and maintaining high vagally related HRV indices is an important response to BV training and competition.

Mental fatigue and ball sports: a narrative review focused on physical, technical, and tactical performance

Abstract Aim: This narrative review aimed to explore the effect of mental fatigue on physical, technical, and tactical performance in ball sports. Methods: Three Databases, PUBMED, SCOPUS, and SCIELO, were used to search for a scientific publication. The criterions adopted were: a) published in a peer-reviewed journal; b) adopted at least one manipulation check related to mental fatigue; c) mental fatigue induced by a cognitive task before the outcome task, and d) study participants were ball sports athletes. Result: The quality of this narrative review was rated at 11 (SANRA scale 0-12), and the papers analyzed were published between 2015 and 2022. Twenty-one experimental studies were included in this review. Most studies were in invasion sports (n = 13; 72%), and non-ecological tasks were used to induce mental fatigue (n = 15; 83%). Regarding performance in endurance tests, mentally fatigued athletes had performance impaired. However, when assessed during a small-sided or simulated game, data were inconclusive within the literature. Moreover, athletes presented attenuated perceptual skills (e.g., visual field). Consequently, this worsened motor skills, technical-tactical performances, and tactical behavior. Conclusions: Cognitively demanding tasks should be avoided before training and sports competitions because they can lead the athlete to mental fatigue and impair performance. This impairment is identified in physical performance (endurance tasks) and technical and tactical performance. Finally, it is recommended that athletes do not perform tasks that cause mental fatigue 2 h before the sports event.

Content validity of scenes from declarative tactical knowledge test for attack situation in beach volleyball - DTKAT-BV / Validação de conteúdo do teste de conhecimento tático declarativo para a situação de ataque no voleibol de praia ­ TCTDA-VP / Validación de contenido del test de conocimiento táctico declarativo para la situación de ataque en voleibol de playa ­ TCTDA-VP

The aim of the study was to establish the content validity of scenes from the Declarative Tactical Knowledge Attack Test in Beach Volleyball (DTKAT-VB). Four experts evaluated 32 attack scenes in real situations of BV game through were assessed the Content Validity Coefficient (CVC) through criteria of language clarity, practical relevance and item representativeness. The results showed that all scenes assessed obtained CVC values greater than 0.80 for all criteria[image clarity (CVC - 0.98); practical relevance (CVC - 0.97); item representativeness (CVC ­ 0.94)], except for one scene, which was excluded. The 31 scenes validated using the CVC enables the evaluation of the declarative tactical knowledge, assisting in the planning of the teaching-learning-training processes of beach volleyball athletes (AU).

O objetivo do estudo foi estabelecer a validade de conteúdo das cenas do Teste de Conhecimento Tático Declarativo do Ataque no Voleibol de Praia (TCTDA-VP). Quatro especialistas avaliaram 32 cenas de ataque em situações reais de jogo de VP foram avaliadas pelo Coeficiente de Validade de Conteúdo (CVC) por meio de critérios de clareza de linguagem, relevância prática e representatividade dos itens. Os resultados mostraram que as cenas avaliadas obtiveram valores de CVC maiores que 0,80 para todos os critérios [clareza da imagem (CVC - 0,98); relevância prática (CVC - 0,97); a representatividade do item (CVC - 0,94)], com exceção de uma cena, sendo assim excluída. As 31 cenas validadas por meio do CVC possibilitam a avaliação do conhecimento tático declarativo, auxiliando no planejamento dos processos de ensino-aprendizagem-treinamento de atletas do voleibol de praia (AU).

El objetivo del estudio fue estabelecer la validación de contenido de las escenas del Teste de Conocimiento Táctico Declarativo del Ataque en el Voleibol de Playa ­ TCTDA-VP. Cuatro especialistas evaluaron 32 escenas de ataque en situaciones reales de juego de VP através del Coeficiente de Validez de Contenido (CVC) através de criterios de claridad del idioma, relevancia práctica y representatividad del elemento. Los resultados mostraron que para todos los criterios [claridad de imagen (CVC - 0.98); relevancia práctica (CVC - 0.97); representatividad del elemento (CVC - 0,94)], obtuvieron un CVC superior a 0,80, excepto por una escena, quedando así excluida. Las 31 escenas validadas por el CVC possibilitaron la evaluación del conocimiento táctico declarativo ayudando em la planificación de los processos de enseñanza-aprendizaje-treinamiento de los deportistas de voleibol de playa (AU).

Mental Fatigue From Smartphone Use Reduces Volume-Load in Resistance Training: A Randomized, Single-Blinded Cross-Over Study.

We investigated the acute effects of mental fatigue induced by 30-minute use of smartphone social network apps on volume load in resistance training among recreationally trained adults. Sixteen (n = 16) adults of both sexes performed three sets of a half back-squat exercise to failure with 80% of 15RM, interspersed with 3-minutes of passive recovery between sets, before and after two different cognitive tasks: (a) use of smartphone social network apps; and (b) watching a documentary. We assessed mechanical variables and ratings of perceived exertion during the strength exercise. Relative to the documentary-viewing control condition, a 30-minute exposure to smartphone social network apps led participants toward increased perception of mental fatigue (p = 0.004) and lower volume-load during the strength exercise (p = 0.006). There were no significant differences in perceived exertion between conditions (p = 0.54), participants' motivation (p = 0.277), intra-set mechanical variables (p > 0.05), or blood lactate concentrations (p = 0.36). Our findings of an isolated possible higher-than normal RPE without changes in physiological variables, accompanying the lower volume-load in the mentally-fatigued participants support psychological, rather than physiological, bases for mental fatigue effects.

Content validity of scenes from declarative tactical knowledge test for attack situation in beach volleyball - DTKAT-BV / Validação de conteúdo do teste de conhecimento tático declarativo para a situação de ataque no voleibol de praia ­ TCTDA-VP / Validación de contenido del test de conocimiento táctico declarativo para la situación de ataque en voleibol de playa ­ TCTDA-VP

The aim of the study was to establish the content validity of scenes from the Declarative Tactical Knowledge Attack Test in Beach Volleyball (DTKAT-VB). Four experts evaluated 32 attack scenes in real situations of BV game through were assessed the Content Validity Coefficient (CVC) through criteria of language clarity, practical relevance and item representativeness. The results showed that all scenes assessed obtained CVC values greater than 0.80 for all criteria[image clarity (CVC - 0.98); practical relevance (CVC - 0.97); item representativeness (CVC ­ 0.94)], except for one scene, which was excluded. The 31 scenes validated using the CVC enables the evaluation of the declarative tactical knowledge, assisting in the planning of the teaching-learning-training processes of beach volleyball athletes.

O objetivo do estudo foi estabelecer a validade de conteúdo das cenas do Teste de Conhecimento Tático Declarativo do Ataque no Voleibol de Praia (TCTDA-VP). Quatro especialistas avaliaram 32 cenas de ataque em situações reais de jogo de VP foram avaliadas pelo Coeficiente de Validade de Conteúdo (CVC) por meio de critérios de clareza de linguagem, relevância prática e representatividade dos itens. Os resultados mostraram que as cenas avaliadas obtiveram valores de CVC maiores que 0,80 para todos os critérios [clareza da imagem (CVC - 0,98); relevância prática (CVC - 0,97); a representatividade do item (CVC - 0,94)], com exceção de uma cena, sendo assim excluída. As 31 cenas validadas por meio do CVC possibilitam a avaliação do conhecimento tático declarativo, auxiliando no planejamento dos processos de ensino-aprendizagem-treinamento de atletas do voleibol de praia.

El objetivo del estudio fue estabelecer la validación de contenido de las escenas del Teste de Conocimiento Táctico Declarativo del Ataque en el Voleibol de Playa ­ TCTDA-VP. Cuatro especialistas evaluaron 32 escenas de ataque en situaciones reales de juego de VP através del Coeficiente de Validez de Contenido (CVC) através de criterios de claridad del idioma, relevancia práctica y representatividad del elemento. Los resultados mostraron que para todos los criterios [claridad de imagen (CVC - 0.98); relevancia práctica (CVC - 0.97); representatividad del elemento (CVC - 0,94)], obtuvieron un CVC superior a 0,80, excepto por una escena, quedando así excluida. Las 31 escenas validadas por el CVC possibilitaron la evaluación del conocimiento táctico declarativo ayudando em la planificación de los processos de enseñanza-aprendizaje-treinamiento de los deportistas de voleibol de playa.

Resistance training with blood flow restriction and cognition in elderly women (project "forte-mente-ativa"): study protocol

Abstract Aim: In the process of aging, there is a decrease on muscle strength and cognitive function. Resistance training combined with blood flow restriction (BFRRT) has been shown capable of maintaining or improve aspects of physical health. However, the effects of BFRRT the cognitive function of the elderly are not clear. This study aimed to describe the design of a randomized controlled clinical trial, that will investigate the effects of BFRRT on cognitive function, physical performance and physiological and morphological aspects in elderly women. Methods: Forty participants will be randomized into one of the following groups: low load resistance training, blood flow restriction resistance training, moderate load resistance training or Control. All intervention groups will complete 16 weeks of resistance training, three times week (45 minutes each), with training consisting of four exercises for the upper and lower body, including three sets of ten repetitions each. No exercise will be performed by the Control group. Cognitive function will be the primary outcome of the study. Secondary outcomes will include body composition, muscle strength, functional capacity, double-task, level of physical activity, static and dynamic balance, brain activity, BDNF neurotrophic factor, anxiety, depression and sleep state). Conclusion: This project will contribute to the existing knowledge and will have a social impact regarding the use of physical exercise as a non-pharmacological tool for the mental and physical health older individuals. Trial Registration: Brazilian Registry of Clinical Trials number RBR-7BC8ZP.

Efeito de diferentes métodos de treinamento sobre o desempenho tático-técnico e a tomada de decisão de atletas masculinos do voleibol de praia / Effect of different training methods on tactical-technical performance and decision-making of beach volleyball male athletes

RESUMO Os métodos de treinamento são ferramentas diferenciais para melhorar o desempenho tático-técnico de equipes. O objetivo do presente estudo foi analisar o efeito de seis semanas na aprendizagem/desempenho segundo a utilização de dois métodos. Participaram 16 atletas masculinos. O estudo teve duração de dez semanas, dividido em três fases principais: avaliações pré, intervenção e avaliações pós. Nas fases pré e pós foram realizadas avaliações do desempenho tático-técnico e a tomada de decisão no ataque. A intervenção foi realizada com três sessões de treinamento por semana no período de seis semanas para cada grupo de acordo com o método (analítico e situacional) e ao final da sessão foram realizados jogos tradicionais e/ou adaptados. Na eficácia das ações com o método de treinamento situacional, a recepção (p= 0,014) e o levantamento (p= 0,004) apresentaram aumento entre os momentos pré vs. pós. No coeficiente de desempenho com o método de treinamento situacional, a recepção (p= 0,025) e o levantamento (p= 0,020) também apresentaram aumento entre os momentos pré vs. pós. E na tomada de decisão do ataque, o grupo situacional (p= 0,019) promoveu adaptações superiores ao método análitico. Conclui-se que o método situacional promove aos atletas iniciantes de voleibol de praia aprendizado em relação aos fundamentos de recepção de saque e levantamento, como também para a tomada de decisão do ataque.

ABSTRACT Training methods are differential tools for improving the tactical and technical performance of teams. The aim of the presente study was to analyze the effect of six weeks on learning/performance using two methods. 16 male athletes participated. The study lasted ten weeks, divided into three main phases: pre, intervention and post evaluations. In the pre and post phases were performed evaluations of tactical-technical performance and decision making in the attack. The intervention was performed with three training sessions per weeks for each group according to the method (analytical and situational) and at the end of the session traditional and/or adapted games were performed. In the effectiveness of actions with the situational training method, the reception (p= 0.014) and the survey (p= 0.004) showed an increase between the pre vs. pos moment. In the performance coefficient with the situational training method, the reception (p= 0.025) and the survey (p= 0.020) also showed an increase between the pre vs. pos moment. And in the decision making of the attack, the situational group (p= 0.019) promoted superior adaptations to the analytical method. It is concluded that the situational method promotes beginners to beach volleyball learning in relation to the fundamentals of receiving service and lifting, as well as for decision making of the attack.

Effects of Six Weeks of High-Intensity Functional Training on Physical Performance in Participants with Different Training Volumes and Frequencies.

High-intensity functional training (HIFT) is characterized by presenting high volumes and training intensities with constantly varied exercises. The aim of this study was to analyze the internal training load and the effects of high-intensity functional training on physical performance in subjects with different training volumes and frequencies. A total of 31 volunteers involved in high-intensity functional training (14 men and 17 women) were divided according to their training volumes and frequencies (high training-volume and frequency-HTVF; (n = 17) (nine women and eight men; age: 31.0 ± 6.3 years; height: 168.8 ± 8.1 cm, body weight: 73.6 ± 11.9 kg; BMI: 25.96 kg/m2) and moderate training volume and frequency-MTVF; (n = 14) (eight women and six men; age: 26.6 ± 4.7 years; height: 167.2 ± 8.6 cm, body weight: 75.8 ± 18.0 kg; BMI: 27.33 kg/m2)). The internal training load was determined using the session-rating of perceived exertion method. The monotony index (MI) and training strain (TS) were used to determine training variability during the training weeks. Countermovement vertical jump height, 20-m sprinting and handgrip strength were assessed at baseline and after six weeks of training. There was a time effect for MI ((F(5, 145) = 5.942; p = 0.0001)), TS ((F(5, 145) = 5.734; p = 0.0001)), weekly internal training load ((F(4.006, 116.87) = 4.188; p = 0.003)) and mean weekly internal training load ((F(4.006, 116.87) = 4.188; p = 0.003)). There was no increase in performance in either group for countermovement vertical jump height ((F(1,29) = 6.081; p = 0.050)), sprinting ((F(1,29) = 1.014; p = 0.322)), right handgrip strength ((F(1,29) = 2.522; p = 0.123)) or left handgrip strength ((F(1,29) = 2.550; p = 0.121)). The current findings suggest that six weeks of high-intensity functional training was not able to increase performance in either group. Therefore, different volumes and frequencies do not seem to influence the increase in physical performance of HIFT practitioners.

Effects of mental fatigue on passing decision-making performance in professional soccer athletes.

The aim of this study was to analyse the effect of mental fatigue on passing decision-making in professional soccer athletes. A controlled and counterbalanced cross-over design was adopted consisting of three visits with a 1-week interval between sessions. Twenty professional soccer male athletes participated in three randomized conditions divided into three visits: control, 15-min Stroop task, and 30-min Stroop task. Inhibitory control was accessed by the Stroop task (accuracy and response time) before and after induced mental fatigue protocol. The athletes played a training match (90-min) following the experimental conditions. The Game Performance Assessment Instrument (GPAI) was used for the passing decision-making analysis. The GPAI analysis showed impaired passing decision-making performance following the 30-min Stroop task compared with the 15-min and control condition (F (2,17) = 6.99, p = .01). Moreover, an increase in response time during the Stroop task was found following 30-min Stroop task condition (F (2,17) = 6.57, p = .03) compared to 15-min of Stroop task and control conditions. Prolonged cognitive tasks may be considered a mediating factor in passing decision-making performance in male professional soccer athletes throughout a full-length training match. Thus, athletes should avoid highly demanding-cognitive tasks before a soccer match. Future studies are required to explore more ecological cognitive tasks to induce mental fatigue (i.e. smartphones and video-games) and their effects on other performance indicators (e.g. physical, technical, tactical) in a full-length training match setting.

Coeficientes de performance preditores da vitória do set no voleibol escolar / Coefficient of performance predictors of set victory in school volleyball

RESUMO O desempenho técnico-tático é fundamental para a vitória no voleibol, deste modo, é importante identificar indicadores associados com a vitória no set. Assim, o objetivo do presente estudo foi identificar e associar os coeficientes de performance técnico-tático em função do resultado do set no voleibol feminino escolar. Participaram do estudo atletas escolares, com idade entre 12 e 14 anos. Foram analisados 27 jogos, resultando em 57 sets, 7194 ações (saque= 2380; recepção de saque= 2157; levantamento= 1358; e ataque= 1299). Posteriormente, foi calculado o coeficiente de performance por ação e set. Utilizou-se de regressão logística binária, para verificar a associação dos coeficientes de performance com a vitória do set. O coeficiente de performance de saque classificado como "bom" mostrou-se como principal preditor de vitória no set (OR = 29,46), seguido por levantamento "bom" (OR= 15,87), e ataque "bom" (OR= 7,32). O saque é o principal preditor de performance no presente estudo, seguido pelo levantamento e ataque. Esses resultados sugerem que o saque deve ser priorizado no treinamento, já que aumenta as chances de vitória no set.

ABSTRACT Technical-tactical performance is essencial to victory in volleyball, so it is important to identify indicators associated with winning the set. Thus, the aim of this study was to identify and associate the technical-tactical coefficient of performance based on the result of the set in the school female volleyball. School athletes participated in the study (age between 12-14 years old). 27 match were analyzed, resulting in 57 sets, 7194 actions (serve= 2380, serve reception= 2157, set= 1358; and attack= 1299). Subsequently, the performance coefficient per action and set was calculated. Binary logistic regression was used to verify the association of the performance coefficients with victory of the set. The serve performance coefficient classified as "good" proved to be a major victory predictor set (OR= 29.46), followed by set classified as "good" (OR= 15.87), and attack classified as "good" (OR= 7.32). The serve is the major predictor in the present study, followed by serve and attack. These results suggest that serve should be prioritized in training, as it increases the chances of victory.

Acute and Chronic Responses of Aerobic Exercise With Blood Flow Restriction: A Systematic Review.

This study systematically reviewed the available scientific evidence pertaining to the acute and chronic changes promoted by aerobic exercise (AE) combined with blood flow restriction (BFR) on neuromuscular, metabolic and hemodynamic variables. PubMed, Web of ScienceTM and Scopus databases were searched for the period from January 2000 to June 2019 and the analysis involved a critical content review. A total of 313 articles were identified, of which 271 were excluded and 35 satisfied the inclusion criteria. Twelve studies evaluated the acute effects and eight studies evaluated the chronic metabolic effects of AE + BFR. For the neuromuscular variables, three studies analyzed the acute effects of AE + BFR and nine studies analyzed the chronic effects. Only 15 studies were identified that evaluated the hemodynamic acute effects of AE + BFR. The analysis provided evidence that AE combined with BFR promotes positive acute and chronic changes in neuromuscular and metabolic variables, a greater elevation in hemodynamic variables than exercise alone, and a higher energy demand during and after exercise. Since these alterations were all well-tolerated, this method can be considered to be safe and feasible for populations of athletes, healthy young, obese, and elderly individuals.

Aerobic exercise with blood flow restriction affects mood state in a similar fashion to high intensity interval exercise.

We investigated the acute effects of aerobic exercise with blood flow restriction (BFR) on mood state in American football athletes. Twenty-two male American football athletes were randomly assigned to three experimental conditions: 1) aerobic exercise (AE: 40% VO2max), 2) aerobic exercise with BRF (AE + BFR: 40% VO2 max), and 3) high-intensity interval exercise (HIIE: 80% and 40% VO2max during exercise and the active intervals, respectively). Mood state and total mood disturbance (TMD) were assessed before, immediately post, and 1 h post-exerciser. Ratings of perceived exertion (RPE) were measured 30 min post-exercise. AE + BFR and HIIE significantly (p < 0.05) increased fatigue and tension compared to baseline immediately post-exercise, whereas vigor significantly (p < 0.05) decreased at the same time point for both conditions. TMD increased significantly (p < 0.05) for AE + BFR and HIIE immediately post-exercise and it remained elevated up to 1 h post-exercise for AE + BFR. AE did not significantly (p > 0.05) affect mood state or TMD and it was significantly (p < 0.05) lower than AE + BFR and HIIE. AE + BFR and HIIE also elicited significantly (p < 0.05) greater RPE levels than AE 30 min post-exercise. Therefore, AE + BFR induces acute impairments in mood state and RPE levels in a similar fashion to HIIE.

Estímulos verbais e musicais promovem maior desempenho no teste de 1rm em mulheres recreacionais no treinamento de força? / Verbal and musical stimulus promote higher performance in the 1rm test in recreational women in strength training?

O objetivo do presente estudo foi comparar o efeito do estímulo verbal, musical e controle no desempenho do teste de 1RM. Vinte mulheres com idade (21,35 ± 3,05 anos), e experiência prévia mínima de um ano em treinamento de força participaram de um desenho do tipo cruzado. Inicialmente, cada voluntária foi submetida a duas sessões de familiarização com intervalo de 48 horas. O teste de 1RM foi realizado para os exercícios supino reto e leg press 45º, em diferentes condições (estímulo verbal, estímulo musical e sem estímulo) de forma randomizada. Na condição de estímulo verbal, foi utilizada a seguinte expressão (e.g. "vamos lá, você consegue!"), enquanto que no estímulo musical foi solicitado as voluntárias que escolhessem músicas que elas consideraram motivá-las de forma livre. No grupo controle, as voluntárias realizaram o teste de 1RM sem nenhum estímulo. Os testes nas diferentes condições foram separados por um período de "washout" de uma semana. ANOVA para medidas repetidas foi utilizada para determinar diferenças entre as condições do teste de 1RM. O nível de significância adotado foi de p ≤ 0,05 e todas as análises foram realizadas através do software Statistical Package for the Social Sciences versão 20.0. Nossos resultados demonstraram um maior desempenho no teste de 1RM para o exercício supino reto (p<0,001) e leg press 45º (p<0,001) a favor dos estímulos verbal e musical quando comparado a condição controle. Neste sentido, concluímos que a utilização de estímulos verbal e musical promoveu efeito ergogênico de forma aguda na força máxima em mulheres treinadas, podendo otimizar a prescrição e ajuste das cargas durante as sessões do treinamento de força....(AU)

The aim of the present study was to compare the effect of verbal, musical and control stimulus on the performance of the 1RM test. Twenty women with age (21.35 ± 3.05 years), and minimum one-year experience in strength training participated in a cross-over design. Initially, each volunteer underwent two sessions of familiarization with a 48-hour interval. The 1RM test was performed for the exercises bench press and leg press 45º, in different conditions (verbal stimulus, musical stimulus and no stimulus) in a randomized way. In the condition of verbal stimulus, the following expression was used (eg "come on, you can!"), while in the musical stimulus volunteers were asked to choose songs that they considered motivating them freely. In the control group, the volunteers performed the 1RM test without any stimulus. The tests in the different conditions were separated by a washout period of one week. ANOVA for repeated measurements was used to determine differences between 1RM test conditions. The level of significance was set at p ≤ 0.05 and all analyzes were performed using the Statistical Package for Social Sciences software version 20.0. Our results demonstrated a better performance in the 1RM test for the bench press exercise (p<0.001) and leg press 45º (p<0.001) in favor of the verbal and musical stimuli when compared to the control condition. In this sense, we concluded that the use of verbal and musical stimuli promoted an acute ergogenic effect at maximum strength in trained women, being able to optimize the prescription and adjustment of loads during the strength training sessions....(AU)

Tradução e confiabilidade do Cuestionário de Conocimiento Procedimental en Voleibol para a língua portuguesa / Cross-cultural adaptation and internal consistency of the Procedural Knowledge Questionnaire in Volleyball for the portuguese language

O presente estudo teve como objetivo realizar a tradução do Cuestionario de Conocimiento Procedimental en Voleibol para a língua portuguesa corrente no Brasil. Para tradução do questionário, foi empregada a técnica de tradução e retro tradução por dois tradutores distintos. As etapas seguintes de equivalência semântica, conceitual e idiomática foram realizadas por um total de seis especialistas no voleibol, dentre eles quatro brasileiros, um venezuelano (instrutor da FIVB) e um uruguaio (presidente da Associação Uruguaia de Voleibol). Posteriormente para se verificar o grau de compreensão da população alvo e consistência interna do questionário, o mesmo foi aplicado a 31 atletas de voleibol com idade de 12 a 15 anos, de ambos os sexos, de um clube local que participa de competições regionais e/ou nacionais. Utilizou-se o SPSS versão 24.0 para realizar as medidas descritivas e estimar o coeficiente de alfa de Cronbach para verificar a consistência interna do instrumento. Como resultado do estudo, foi realizada a efetuação da tradução do instrumento para língua portuguesa, a qual não foi realizada grandes modificações com relação ao questionário, apenas a adição de alguns termos ou palavras para melhorar o entendimento do mesmo e, sobre a avaliação da consistência interna do instrumento, foi obtido o valor de alfa de Cronbach de 0.72, tornando-o aceitável segundo a literatura especializada. Conclui-se que o instrumento foi traduzido e possui valor de consistência interna aceitável, porém, faz-se necessário que outros estudos sejam conduzidos para realizar a validação por completo do presente instrumento....(AU)

The present study aimed to translate the Questionnaire of Procedural Knowledge in Volleyball for the Portuguese language current in Brazil. For translation of the questionnaire, the technique of translation and back translation was used by two different translators. The following stages of semantic, conceptual and idiomatic equivalence were performed by a total of six volleyball specialists, including four Brazilians, one Venezuelan (FIVB instructor) and one Uruguayan (president of the Uruguayan Volleyball Association). Subsequently, to verify the degree of comprehension of the target population and the internal consistency of the questionnaire, the same was applied to 31 volleyball players aged 12 to 15 years, of both sexes, of a local club that participates in regional competitions and / or national. SPSS version 24.0 was used to perform the descriptive measures and to estimate the Cronbach's alpha coefficient to verify the internal consistency of the instrument. As a result of the study, the translation of the Portuguese language instrument was carried out, which did not make any major changes in relation to the questionnaire, only the addition of some terms or words to improve the understanding of the instrument, and on the evaluation of internal consistency of the instrument, the Cronbach's alpha value of 0.72 was obtained, making it acceptable according to the specialized literature. It is concluded that the instrument has been translated and has an acceptable internal consistency value, however, it is necessary that other studies be conducted to carry out the complete validation of this instrument....(AU)

Effect of different training strategies with the use of weight vests on the internal load in volleyball athletes / Efeito de diferentes estratégias de treinamento com o uso de coletes de peso sobre a carga interna em atletas de voleibol

ABSTRACT The aim of this study was to compare the internal load coming from different training strategies in volleyball athletes and that planned by the coach. Seventeen male athletes (22.8 ± 2.9 years of age), national university level, participated in a training period and were randomized into three groups: Plyometric training with weight vests (PVG), technical-tactical training with weight vests (TVG) and control group (CG). Vests were equal to 7.5% body mass (BM) and all groups participated in the same training routines. Six training weeks were monitored from the method of ratings of perceived exertion (Session-RPE). Prior to sessions, the coach ranked Session-RPE estimation based on the previously prepared planning and after sessions, the Session-RPE of each athlete was recorded to analyze the cumulative total weekly training load (Cumulative-TWTL). One-way ANOVA was used to compare Cumulative-TWTL among groups and to compare the Session-RPE of groups in each session with that predicted by the coach. No difference in Cumulative-TWTL among groups was observed (p<0.05) and only in session 21, the Session-RPE of CG was higher than that predicted by the coach (p<0.05). It was concluded that the use of weight vests (7.5% BM) did not alter the training responses in the study athletes, with Session-RPE being in line with the load planned by the coach.

Resumo O objetivo deste estudo foi comparar a carga interna advinda de diferentes estratégias de treinamento em atletas de voleibol e destes com a planejada pelotreinador. Dezessete atletas masculinos (22,8±2,9 idade), nível universitário nacional, participaram de um período de treinamento, sendo randomizados em três grupos: Treinamento pliométrico com coletes de peso (GCP), treinamento técnico-tático com coletes de peso (GCT) e grupo controle (GC). Os coletes equivaleram à 7,5% da massa corporal (MC) e todos os grupos participaram das mesmas rotinas de treinamento. Foram monitoradasseis semanas de treinamento a partir do método da percepção subjetiva ao esforço da sessão (PSE-sessão). Antes das sessões, o treinador classificou sua estimativa da PSE-sessão com base no planejamento previamente elaborado e após as sessões foi registrada a PSE-sessão de cada atleta para analisar a carga de treinamento semanal total acumulada (CTST-acumulada). A ANOVA "one way" foi utilizado para comparar CTST-acumuladaentre os grupos e para comparar a PSE-sessão dos grupos, em cada sessão, com a predita pelo treinador. Não houve diferença na CTST-acumulada entre os grupos (p<0,05) e apenas na sessão 21 a PSE-sessão do GC foi maior que a predita pelo treinador (p<0,05). Conclui-se que o uso de coletes de peso (7,5% da MC) não alterou as respostas ao treinamento nos atletas analisados, estando a PSE-sessão em consonância com a carga planejada pelo treinador.

Associação Entre a Técnica Utilizada e o Desempenho Técnico-Tático no Voleibol Escolar Feminino / Association between the Technique Used and the Technical-Tactical Performance in Female School Volleyball

O voleibol é praticado por meio dos fundamentos de saque, recepção de saque, levantamento, ataque, bloqueio e defesa, empregando-se um conjunto de técnicas que podem interferir na qualidade das ações. Deste modo, o objetivo desta pesquisa foi analisar a associação da técnica utilizada nas ações do saque, de recepção de saque, do levantamento e do ataque com a qualidade das ações. Participaram do estudo 11 escolas/equipes, que competiram durante os "Jogos Escolares da Paraíba", com idades entre 12 a 14 anos, sendo todos do sexo feminino. Os jogos foram filmados usando uma câmera para análise posterior. Ao total foram analisados 27 jogos, resultando em 47 sets, nas ações de saque (2.380), recepção de saque (2.157), levantamento (1.358) e ataque (1.299). Para classificar a qualidade das ações foram utilizadas duas escalas, de acordo com a finalidade da ação. O teste do Qui-quadrado foi usado para verificar a associação das técnicas aplicadas em cada fundamento com a qualidade das ações. O saque tipo tênis foi o predominante utilizado no saque (81,2%), a manchete para recepção de saque e levantamento (85% e 65,8%, respectivamente) e corte com e sem salto para ataque (∑= 53,6%). Houve associação entre as técnicas e a qualidade da ação de saque (ꭕ2= 114,612; p< 0,001), recepção de saque (ꭕ2= 70,693; p< 0,001), levantamento (ꭕ2= 205,864; p< 0,001) e ataque (ꭕ2= 241,678; p<0,001). Os resultados deste estudo demostram que a técnica interfere na qualidade das ações. Assim, as principais técnicas foram saque tipo tênis (saque), toque (recepção de saque e levantamento) e corte com salto (ataque). (AU)

Volleyball is played by means of fundamentals serve, serve reception, set, attack, block and defense using a set of techniques that can interfere in the quality of actions. The aim of this research was to analyze the association of the technique used in the actions of the serve, serve reception, set and attack with the quality of actions. Eleven schools / teams competed during the "Paraíba School Games", 12 to 14 years old, female. The games were filmed using a camera for further analysis. In the total 27 games were analyzed, resulting in 47 sets, in the actions of serve (2.380), serve reception (2,157), set (1,358) and attack (1,299). To classify the quality of actions, two scales were used according to the purpose of the action. The Chi-square test was used to verify the association of applied techniques in each foundation with the quality of actions. The standing type was the predominant used in the serve (81.2%), forearm pass for serve reception and set (85% and 65,8%, respectively) and spike with and without jump for attack (Σ = 53.6 %). There was association between the techniques and the quality of the serve action (ꭕ2= 114,612; p< 0,001), serve reception (ꭕ2= 70,693; p< 0,001), set (ꭕ2= 205,864; p< 0,001) and attack (ꭕ2= 241,678; p<0,001). The results of this study demonstrate that the technique interferes in the quality of actions. Thus, the main techniques were standing type (serve), overhand (serve reception and set) and spike with jump (attack).(AU).