Fluid intake, hydration status and body mass changes in u-15 judo athletes during a training day: Hydration in young judoists

EnglishDespite numerous studies related to dehydration there is still a lack of scientific literature presenting hydration status and fluid intake of judo athletes during different periods. Therefore, the aim of this study was to investigate, fluid intake, hydration status and body weight changes of young judo athletes during a typical day of training in preparation period. Twenty-two young judo athletes (age: 12 ±0.7 y, experience: 3.5 ±1.1) voluntarily participated in this study. Hydration status and weight were examined in the morning, before and immediately after the training. All athletes trained 90 min and they consumed fluids ad libitum during the exercise. According to morning urine specific gravity (USG) values, 81.2% of the athletes were dehydrated while only 18.8% of the athletes were euhydrated. Pre-training urine measurements showed that 63.64% of the athletes presented dehydration and 77.27% of the athletes completed the training in dehydrated condition despite fluid availability during the training. Mean body weight loss during training was -0.64±0.66%. It can be concluded that young judo athletes presented high prevalence of dehydration as indicated by USG values. Most of the athletes were dehydrated during a typical training day and completed the training in more dehydrated conditions compared to pre training values despite ad libitum fluid intake. It is of great importance to evaluate hydration status of the athletes before training to refrain from common practice of fluid restriction for weight loss and adverse effects of a persistent state of fluid deficit on physical and health related state. portuguesIntroducao e objetivo: Apesar dos diversos estudos relacionados a desidratacao, ainda ha carencia de estudos na literatura cientifica apresentando o estado de hidratacao e ingestao de liquidos de judocas em diferentes periodos. Sendo assim, o objetivo deste estudo foi investigar a ingestao de liquidos, estado de hidratacao e as alteracoes do peso corporal de jovens atletas de judo durante um dia tipico de treinamento. Materiais e metodos: Vinte e dois jovens atletas de judo (idade: 12 ±0,7 anos, experiencia: 3,5 ±1,1) voluntariamente participaram deste estudo. O estado de hidratacao e o peso foram avaliados pela manha, antes e imediatamente apos o treinamento. Todos os atletas treinaram 90 min e consumiram liquidos “ad libitum” durante o treinamento. Resultados: De acordo com os valores da gravidade especifica da urina matinal (USG), 81,2% dos atletas estavam desidratados enquanto apenas 18,8% dos atletas estavam reidratados. As medidas de urina pre-treinamento mostraram que 63,64% dos atletas apresentaram desidratacao e 77,27% dos atletas completaram o treinamento desidratados apesar da disponibilidade de liquidos durante o treinamento. A perda media de peso corporal durante o treinamento foi de -0,64 ± 0,66%. Conclusao: Pode-se concluir que jovens atletas de judo apresentam altas prevalencias de desidratacao, indicadas pelos valores da USG. A maioria dos atletas estavam desidratados durante um dia tipico de treinamento e conseguiram completar o treinamento em condicoes mais desidratadas em comparacao aos valores pre-treinamento, apesar da ingestao de liquidos “ad libitum”. Sendo assim, destaca-se que e de grande importância avaliar o estado de hidratacao dos atletas antes do treinamento para evitar a pratica comum de restricao de liquidos.