Fig. 8
Comparisons of +3.0 Gz-induced %-changes in blood flow and O2 concentration between the hippocampus and the cortex. The %-changes were calculated as [measured value × 100/value in a baseline control period]. The recovery time is the duration (s) from the end of +3.0 Gz exposure to a returning point to the control level before the acceleration. Data are expressed as mean ± SE. % BF the %-changes in tissue-blood flow in six rats, % PO 2 the %-changes in tissue-oxygen concentration in seven rats.*p < 0.05, and **p < 0.01 by one-factor ANOVA with the Tukey–Kramer test. Acceleration of +3.0 Gz caused significantly deeper hypoperfusion and hypoxia in the hippocampus than in the cortex, and significantly longer recovery time in PO2 than that in blood flow at both the hippocampus and the cortex [19–21, 27, 28]