Fig. 2
Average MWM latency time of rats in all groups (n = 15). a, b There are significant interaction effects between hypercapnia and hypoxia treatment at 48 and 72 h (P < 0.05). c Simple effects analyses show that there is no difference between hypercapnia group and S group at 48 and 72 h (ns P > 0.05). Hypoxemia group has a longer escape latency than S group at 48 and 72 h (**P < 0.01). HH group has the longest escape latency in comparison with hypercapnia group (**P < 0.01) and hypoxemia group (**P < 0.01) at 48 and 72 h. S group sham-operated group, HH group hypercapnia + hypoxemia group. The concentrations of CO2 and O2 in the air are 0.03 and 21%, respectively