Table 2 Plasma osmolality (mosmol/kgH2O) of subjects while they drink water with different temperatures -shown as mean (SD). Water temperature Posm before procedure Posm 3min before drinking Posm 3min after drinking Posm 9min after drinking Posm 15min after drinking 5°C 297.50 (3.16) 304.50 (3.25) * 305.20 (3.43) 304.85 (1.58) 314.15 (1.58) 16°C 308.00 (2.54) 313.25 (3.62) * 313.60 (1.71) 313.60 (4.73) 312.55 (3.09) 26°C 306.25 (1.58) 313.60 (4.54) * 313.11 (3.23) 312.90 (4.60) 311.50 (3.91) 58°C 305.90 (3.43) 315.00 (5.48) * 314.65 (4.08) 314.30 (4.34) 313.25 (4.08) The difference between Posm before and after dehydration (before procedure and before drinking) was statistically significant for all experiments. No significant (* p < 0.01) change of Posm occurred after water intake up to 15min after drinking.