Body hypohydration degree significantly influences the athletes` performance, which is especially important for sport game players. The hydration degree of athlete`s body determines his aerobic endurance and the ability to perform psychomotor tests. Thirst sensation cannot be plausible indicator to regulate water uptake, because plain water suppresses thirst (thus further drinking) therefore the water uptake will be twice smaller than necessary. The aim of our investigation is to determine the effect of 1.5 hours football training on urine specific gravity and hydration degree of athlete in winter conditions. Forty football players from the first league teams participated in the investigation voluntarily. Their mean age was 20.5 ± 3.5 years; height - 180.7 ± 6.2cm and mean body mass - 76.4 ± 8.2kg. The players are weighed using precise scales. Urine samples were collected before and after the training. Urine specific gravity was measured by urine refractometer. Results show that before training 14 (35%) athletes were euhydrated, 24 athletes (60%) were hypohydrated and two athletes (5%) were seriously hypohydrated. After training 4 (10%) athletes were euhydrated, 22 athletes (55%) were hypohydrated and 14 (35%) were seriously hypohydrated. The mean weight loss during the training was 0.80 ± 0.55kg, but the mean water loss - 0.53l/h. Even 1.5 hours prolonged training changes urine specific gravity. Results show that more than half of players were hypohydrated even before the training and body hydration degree worsens after the training. The recommendation is to uptake greater amount of mineral water before, during and after training.
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