By contrast, the hypohydrated (HYP) and severely hypohydrated (S-HYP) groups significantly decreased their urine osmolality (i.e., rehydration) in the same period of time (HYP = −9.5 %, ES = 0.61; p < 0.01; S-HYP = −17.7 %, ES = 1.53; p < 0.01; Fig. 1).