Analysis of fluid intake during swimming in junior swimmers

The purpose of this study was to clarify the fluid intake during swimming training. The subjects were eighteen girl junior swimmers (11.7±1.8 years old with competitive experiences of 5.2±2.2 years). The mean water temperature during training was 29.8±0.2℃ and the mean training (workout) time was 2.23±0.26 hours. Weight loss per hour and weight loss normalized by the initial body weight and training hours was 0.08±0.06kg/hr and 2.21±1.79 g/kg/hr, respectively. Sweat loss per hour and sweat loss normalized by the initial body weight and training hours was 0.13±0.07 kg/hr and 3.89±1.97g/kg/hr, respectively. Fluid intake volume normalized by the initial body weight and training hours was 2.23±2.08 g/kg/hr. Fluid intake frequency and mean fluid intake volume was 5.1±2.4 times and 33.5±26.6g, respectively. Fluid intake ratio (fluid intake/ sweat loss multiplied by 100) was 69.05±64.52%. There was significant relationship between sweat loss and fluid intake volume. There was significant relationship between fluid intake volume, fluid intake ratio and fluid intake frequency. But, there was no significant relationship between sweat loss, mean fluid intake volume and fluid intake frequency. These data show that as frequency of fluid intake increases, fluid intake volume and fluid intake ratio rise. It is considered that swimmer have to increase frequency of fluid intake to prevent dehydration during swimming training