Diferentes tipos de hidratação durante o exercício prolongado e sua influência sobre o sódio plasmático Different types of hydration during a lenghened exercise and their influence on plasmatic sodium

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This study aims at identifying alterations in plasmatic sodium concentration, concerning four hydration procedures: a) water ad libitum; b) scheduled water; c) sport drink of type1 (SD-T1); d) and sport drink of type 2 (SD-T2). An intragroup (intranalysis) and an intergroup (interanalysis) were performed on hydration procedures during a physical work with a duration of 120 minutes and an intensity of 65% VO2max. The sample was composed by 15 cyclists aged 20.8 ± 2.7 years on the average, and 65.5 ± 5 ml (Kg.min)-1 VO2max. For the serial collection, some blood samples of 90 - 105 μl blood were taken from the digital pulp of the resting finger, while for partial collections the same samples were taken at 60, 90 and 120 minutes during the exercise. The statistical treatment consisted of the ANOVA " One Way " for the repeated measures, which was associated to the " Tukey " test at a confidence level of P

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... In the realization of prolonged physical exercises, associated with hot and humid environments, the defi nition of the type of liquid to be ingested is important and signifi cant contributions have been made 18, 19 . The ingestion of water appears not to be the best alternative to liquid consumption, but sports drinks 20 instead. ...
... There were no signifi cant differences between groups for urinary coloration indexes (p> 0.05) ( Table 2). However, all groups showed high levels, both before (GCpre =4,50±1,92; GA pre =4,87±1,45 e GS pre =5,00±1, 19) and after the TC (GC post =5,62±1,59; GA post =5,62±1,76 e GS post =5,00±2,26). This result shows that the groups already showed some state of dehydration in the moments before the TC. ...
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Introduction: The physical training of athletes requires a good state of hydration, because the maintenance of adequate levels of water can favor the performance. The objective of the study is to evaluate the hydration state of swimmers from the city of Aracaju after training sessions with different forms of hydric replacement. Materials and Methods: Eight swimmers (age 24,25±7,30 years-old) completed three controlled training sessions under different forms of hydric replacement: no fl uid ingestion (GC), water ingestion (GA), consumption of sports drinks (GS). Hydration state was determined by urinary coloration and percentage of body mass change. Results: Based on urinary coloration, GS has better clas-sifi cation of hydration status than GC and GA. Signifi cant difference was found in relation to percentage of body mass change (p<0.05) between groups, with hydric replacement advantage for GS. Discussion: The water can promote an adequate hydration status, but sports drinks seem to offer a better hydric replacement.
... Cabe destacar que micronutrientes e vitaminas também devem ser consumidos adequadamente, pois desempenham funções importantes durante o exercício 62 . Finalmente, tem-se a preocupação com a homeostase hídrica, tendo em vista que um quadro de desidratação, seja crônico ou agudo, prejudica as funções biológicas e consequentemente o desempenho físico 42 . ...
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