Figure 1. Minute ventilation in normoxia, hypoxia and hypercapnia.
Ventilation during normoxia (A), hypoxia (B) and hypercapnia (C) in male (black bars, shaded black bars) and female (white bars, shaded white bars) rats at postnatal ages 10-11, 12-13, 14-15, 30 and 90 days. Asterisk indicates statistically significant sex differences (P< 0.05). Shaded bars indicate a statistically significant difference compared to the previous age group of the same sex (P<0.05).