Throwing velocity is a relevant variable in water polo performance. Few studies have investigated the throw's speed during an official competition or real game situation in high level competition. All throws performed in 27th European Championship in 2006 (Belgrade, Serbia) and 12th World Championships in 2007 (Melbourne, Australia) were analyzed in the present study. The total sample was composed of 5,691 throws (2,474 in female category). The study was developed with an observational design. A digital video camera, a radar and Polo Análisis Directo v1.0 software were used to record data. The reliability between the observers was verified using the kappa agreement index, ensuring that in all cases this value was greater than .85. The average maximum speed of throws in female water polo was 13.88 m/s (±2.44 m/s) and 16.94 m/s (±3.38 m/s) in male. The variables distance and game situation showed a combined ability to predict 19% of speed differences in female water polo throws and 33% in male.

Objetivo: establecer y comparar criterios de evaluación de los niveles de sobrepeso y obesidad en adolescentes canarios y si la información proporcionada por los indicadores Índice de Masa Corporal e Índice Cintura-Altura se corresponden. Método: Participaron en dicho estudio 4282 escolares de centros públicos de Canarias con edades comprendidas entre los 11.75 y los 16.25 años, de los cuales 2154 fueron de sexo masculino y 2128 del sexo femenino. A partir de la medida de la masa y la altura, se construyeron los valores del Índice de Masa Corporal, utilizando los puntos críticos de las tablas de la Fundación Orbegozo para segmentos de 6 meses de edad, y se clasificaron en normopeso, sobrepeso y obesidad. Con la información sobre el perímetro de la cintura se obtuvieron los valores del Índice Cintura-Altura y se definieron puntos críticos que situarán el mismo porcentaje en normopeso, sobrepeso y obesidad para cada uno de los segmentos de edad clasificados según el Índice de Masa Corporal, obteniendo, de esta manera, puntos críticos Índice Cintura-Altura para estos grupos por edad y sexo. Posteriormente se utilizaron funciones splines para definir puntos críticos como funciones continuas de la edad. Resultados: muestran que las funciones splines aplicadas a los percentiles obtenidos para el Índice de Masa Corporal e Índice Cintura-Altura muestran evoluciones diferenciadas según la edad y el sexo. Conclusión: las modificaciones antropométricas en la adolescencia sólo pueden ser tenidas en cuenta con criterios que contemplen el cambio continuo con la edad y que la información obtenida por el Índice de Masa Corporal debe ser complementada por indicadores como Índice Cintura-Altura, más sensible a dichas modificaciones.

No abstract

The study seeks to examine the use of time-out in water polo. For this, was analyzed it uses by coaches women's category in Water polo World Championship held in Melbourne, Australia 2007. All matches were recorded by a digital video camera, located in a central and elevated position on the halfway line. Subsequently, several observers unrelated to this study, which had been previously trained, analyzed all downtime analysis using the software Polo Análisis Banquillo v1.0. The variables observed were the quarter of play, the momentary results, the reason to apply, under front and rear situational, the immediate effect and the final score. It is observed that women's water polo coaches make more use of time-out in the last period, with an adverse score, after a temporary expulsion, being equal to pass to inequality, no goal is achieved and its requested further by the losing team.

The sports in which there is the figure of goalkeeper, becomes relevant in order to obtain high performance, the perception of success that this participant is formed and that is configured as an expectation. Therefore, this study aims to analyse the association between perception of self-efficacy of two elite water polo goalkeepers and their coach and the observable performance in an international tournament. In order to measure the perception of behavioural success and their coach, it was used the Scale of achievement self-efficacy for water polo goalkeepers (Argudo, De la Vega, Tejero, & Ruiz, 2013). To measure the performance, were analysed all throwing`s received by the two goalkeepers in the XV Water polo World Championship. The results indicate that there are differences between the perception of the player, the coach and the observed behaviour, appreciating that the goalkeeper's perception of success is superior to what actually happens. While in the female case, player and coach perception is less than the observed behaviour.