Fig. 5. Cumulative urine volumetric responses (over 5h) to infusion of 2% body mass of isotonic saline in pre-flight supine and seated conditions and during flight (flight days 4–6). Data from Norsk and colleagues (Norsk et al., 1995) (N=4; means + S.E.M.). *Significantly greater than seated and flight values (P<0.05).