Effect of age on hypoxic-induced depression. (A) Representative traces of monosynaptic reflex potential (MSR), slow ventral root potential (sVRP) and dorsal root potential (DRP) in postnatal day 0–3 (P0–3, upper panel) and 5–8 rats (P5–8, lower panel), both before (control) and during hypoxia (hypoxia) at 27°C. (B) The hypoxia-evoked depression of MSR, sVRP and DRP in P0–3 and P5–8 rats at 27°C. Each symbol and error bar represents the mean ± SEM (n = 8–11).