The aim of this study was to evaluate the degree of dehydration from the hydric balance and density of urine (Du) in half marathon runners. The study included 18 male subjects. The fluid intake was "ad libitum" and was held in Du analysis at the beginning and at the end of the race, as well as measurements of weight and height. Environmental conditions (33,30 ± 5,30 ºC and 57,50 ± 13,60% of URA) were recorded by digital hygrometer. The subjects began and finished the study dehydrated, and showed a significant difference in body weight (4,11%). We conclude that the fluid intake "ad libitum" was not sufficient to maintain hydric balance.
Dehydration; Density of Urine; Half Marathon; Water Balance
