The effects of the helicopter flight on red blood cell parameters. (A) Haematocrit (Ht), (B) intracellular pH, (C) ATP levels, (D) 2,3-diphosphoglycerate (2,3-DPG) levels, (E) glucose levels, (F) supernatant K+, (G) supernatant Hb, and (H) rate of haemolysis. The flight had no effect on any parameters at day 7 (immediately after the flight), day 14 and day 21 after the donation. However, 42 days after the donation the supernatant Hb and rate of haemolysis were statistically increased in the units of red blood cells that had undergone the flight. (G,H). Control group (○: n=5) Flight group (▴: n=5). Error bars represent standards error of distributions (SD); *Significant differences (p<0.05) between the control group and the flight group.