Abstract des Autors

Boys usually practice soccer (SC) and futsal (FS) for long and successive sessions and may become dehydrated. To examine hydration status and sweating of prepubertal (PP) and pubertal (P) boys during SC and FS training. Before and after training, 21 soccer (13PP (SCPP)), 8P (SCP)) and 26 futsal players (14PP (FSPP), 12P (FSP)) voided and body mass was measured. Urine was analysed for color and specific gravity (USG). Training lasted 1 to 1.6 h, and players could drink water as desired every 30-min. Sweat volume was calculated from body mass change corrected by fluid intake and urine output. Patches were attached in the scapula region to collect sweat for analyses of [Na+]. Urine markers indicated that boys arrived in the training slightly hypohydrated (color=4±1.42 and USG=1.021±0.006). In SC session, sweat volume and water intake (in mL) of the PP (465±287 and 207±192) were lower (P=0.024 and 0.033) than those of P (852±399 and 447±259). In FS, sweat volume 503±220 and 627±282mL and water intake (342±118 and 344±194 mL) were similar between PP and P. Individual and mean dehydration levels was not >1%. PP’s sweat [Na+] was 58.7±16.8 and P’s, 65.0±24.5 mmol.L-1, and respective sweat Na+ losses were 0.52±0.34 and 0.82±0.53 g.h-1. Body water deficit was minimal in SC and FS, probably because boys could drink every 30-min break. Hydration opportunities during and following training are important to prevent further fluid deficits, especially when SC and FS players have successive training/competition sessions in the heat. Verf.-Referat