García, J.V., Yuste, J.L., García, J.J., & Hellín, M. (2015). Body mass changes and ad libitum fluid replacement in elite futsal players during official compe-tition. J. Hum. Sport Exerc., 10(4), pp.891-903. The aim of this study was to calculate sweat loss, voluntary fluid replacement and levels of dehydra-tion in elite futsal players during official competition. Measurements were made in 12 male elite futsal players during six official matches in the Spanish First Division (22-26 ºC and relative humidity 32-42.33%). Participants were weighed before the warm up and they reweighed immediately after the games. Sweat loss was assessed through changes in body mass after taking into account fluid intake and urine loss. To analyze this data the statistics used were descriptive and non parametric. Mean sweat loss of players amounted to 2.29 litres (s = 0.73). Mean fluid intake was 1.5 litres (s = 0.74), re-placing 68.37% (s = 32.44) of total fluid loss. Players incurred a body mass deficit of 1.04% (s = 1.06), which is not seen as affecting their performance. There were no significant difference in sweat lost replaced and dehydration in relation to analyzed match (P > 0.05). There is a correlation between game time and body mass loss (r = 0.323, P = 0.016). From the results, we conclude that the level of hydra-tion in studied players can be seen to maintain itself through a correct level of fluid intake. However, these measurements allow an individualisation of player hydration strategies, not taking exclusively into account game time.

La fuerza explosiva de los segmentos inferiores tiene un importante papel en los karatekas. Para su medición, los tests de salto Abalakov (ABK) y el salto con contramovimiento o Countermovement Jump (CMJ) son los más aceptados en las investigaciones. El objetivo de este estudio es analizar las horas de entrenamiento semanal y los resultados obtenidos en el salto vertical CMJ y ABK de 28 karatekas de categoría juvenil españoles (15 hombres y 13 mujeres), con edades comprendidas entre los 12 y 13 años, todos ellos participantes en la fase final del Campeonato de España de Karate. Se compararon los resultados en función del sexo por medio de la prueba T de Student, así como se realizó el ANOVA para conocer la relación entre el IMC y los resultados en los saltos. Para conocer la correlación entre horas de entrenamiento y los valores de fuerza explosiva se empleó la prueba Rho de Spearman. Los valores de horas de entrenamiento semanales son superiores en las chicas (horas de entrenamiento= 10.46 ± 3.04) frente a los chicos (horas de entrenamiento= 6.16 ±3.19). Los chicos tienen mayores valores medios en los resultados del salto CMJ (chicos 0.31 ±0.57; chicas 0.28 ±0.03) y ABK (chicos 0.35 ±0.06; chicas 0.33 ± 0.06). No existen diferencias significativas en los datos de salto CMJ y ABK en función del sexo de los karatekas. Abstract. Explosive strength of the lower segments plays an important role in karatekas. For its measurement, the Abalakov jump (ABK) and the counter-motion jump or Countermovement Jump (CMJ) are the most accepted test in research. The objective of this research work was to describe and analyze the results in CMJ and ABK tests of 28 Spanish youth category karatekas (15 boys and 13 girls), aged between 12 and 13 years, all of them participating in the final phase of the Spanish Karate Championship. Results were compared by gender using the Student's T test, as well as ANOVA was performed to assess the relationship between BMI and results in the jump tests. The Spearman Rho test was used to evaluate the correlation between training hours and explosive strength values. The values of weekly training hours are higher in girls (training hours = 10.46 ± 3.04) compared to boys (training hours = 6.16 ± 3.19). Boys have higher average values in CMJ jump results (boys 0.31 ± 0.57; girls 0.28 ± 0.03) and ABK (boys 0.35 ± 0.06; girls 0.33 ± 0.06). There are no significant differences in CMJ and ABK jump data by gender of the karatekas.

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