Analysis of jump load during a volleyball season in terms of player role.

OBJECTIVES: The aim of this study was to analyze the jump load performed by top-level volleyball players during an entire training season in terms of the player role, training period, type of daily training, and quality of opposition in the subsequent match. DESIGN: Longitudinal panel observational study. METHODS: The total number of jumps performed by players was recorded through 174 training days distributed in 32 weeks during the 2016/2017 season (pre-season, 5 weeks; in-season, 27 weeks). The players role were classified as middle-blocker, outside-hitter, opposite and setter (the libero was omitted). A generalized mixed linear model was performed (with Bonferroni post hoc test at p<0.05) to assess the effect of training variables and the repeated-measures data of players' jumps along various training days. Additionally, the effect sizes at 95% confidence intervals were calculated to compare the jump load between players' role and training variables. RESULTS: The results showed a significant and moderate higher amount of jumps performed by middle-blockers regardless the type of macro- or micro-cycle, the micro-cycle phase, the type of training and the quality of match opposition. Contrarily, the setter performs the least jump load in all variables analyzed. Only the players' role, macro-cycle and micro-cycle phase had significant effects on the player's jump load variation along the season. CONCLUSIONS: This information could be useful to guide the monitoring and preparation process for coaches and physical trainers. These values allow differentiating between players' role and could be used as references values in order to avoid injuries whereas performance increase along the season.

Relación entre estados de ánimo y rendimiento en voleibol masculino de alto nivel / Relationship between mood states and performance in elite male volleyball / Relação entre estados de humor e desempenho no voleibol masculino de alto rendimento

El presente estudio, valiéndose de un diseño ex post facto retrospectivo, analizó la relación entre los estados de ánimo precompetitivos y el rendimiento deportivo de un equipo de doce jugadores de voleibol durante el campeonato del mundo de Brasil-2011, categoría masculina sub-20. Para la medición de los estados de ánimo se utilizó el instrumento Profile of Moods States (POMS). La medición del rendimiento deportivo se llevó a cabo a partir de dos instrumentos: por una parte, una escala de valoración o percepción de los entrenadores a propósito del rendimiento de sus jugadores y, por otra, el software Data Voley System. Se procedió con estadística descriptiva y estadística inferencial no paramétrica. Los participantes mostraron un perfil anímico de alto vigor, moderada tensión, baja cólera, y mínima fatiga y depresión. Se detalla la relación entre las variables estudiadas y se discute cómo el hecho de perder un partido que tuvo como consecuencia la exclusión del equipo a la opción de ganar medalla, influyó hacia una menor tensión y vigor de los jugadores, a la vez que aumentó la depresión y la fatiga

This paper presents an ex post facto study. The aim was to analyse the relationship between pre-competition mood states and sports performance in a team of twelve male players from the under 20 category during the Brazil 2011 World Volleyball Championship. The Profile of Mood States (POMS) was used to measure mood, while sports performance was measured using two instruments: on the one hand, a scale for the coach’s perception of his players’ sports performance and, on the other, Data Volley System software. The data was analysed using descriptive and non-parametric inferential statistics. The participants showed a high drive, moderate stress, and low anger, with minimal fatigue and depression. The paper outlines significant relationships among the variables under analysis. It is noted that when the team lost a match, thus losing out on the chance to win a medal, the players’ moods changed: they felt less stressed and their drive fell, while their sense of depression and fatigue rose

O presente estudo, utilizando um delineamento ex post facto retrospectivo, analisou a relação entre os estados de humor pré-competitivos e o rendimento desportivo de uma equipa de doze jogadores de voleibol durante o Campeonato do Mundo Brasil 2011, escalão sub-20 masculino. Para avaliação dos estados de humor foi utilizado o Profile of Moods States (POMS). A avaliação do rendimento desportivo foi levado a cabo através de dois instrumentos: um primeiro, uma escala de avaliação ou percepção dos treinadores a propósito do rendimento dos seus jogadores, e outro, o software Data Voley System. Procedeu-se a uma análise estatística descritiva e inferencial não paramétrica. Os participantes revelaram um perfil de alto vigor, moderada tensão, baixa cólera, fadiga e depressão mínimas. Explana-se a relação entre as variáveis estudadas e discute-se como o facto da derrota num jogo que teve como consequência a exclusão da equipa da luta pela medalha, influenciou uma menor tensão e vigor dos jogadores, aumentando por sua vez a depressão e fadiga nos mesmos