Table 2.

Phrenic Nerve Burst Frequency

	Intact Nx28	C2Hx Nx28	C2Hx dAIH28	C2Hx IH28-2/2
Baseline	46 ± 1	*53 ± 2	*55 ± 2	*55 ± 2
H1	61 ± 2	66 ± 2	62 ± 2	63 ± 2
H2	63 ± 2	71 ± 2	68 ± 2	65 ± 2
H3	64 ± 2	71 ± 3	68 ± 2	66 ± 2
90 min	47 ± 1	57 ± 2	56 ± 1	55 ± 2
Chemoreflex stimulation	53 ± 2	56 ± 2	57 ± 2	57 ± 1

Phrenic nerve burst frequency at baseline, H1, H2, H3, 90 min after moderate acute intermittent hypoxia, and during hypercapnic chemoreflex stimulation.

^*Different from intact Nx28.

Nx28, 28 days of normoxia; C2Hx, chronic C2 hemisection; dAIH, daily acute intermittent hypoxia; IH28-2/2, intermittent hypoxia simulating moderate sleep apnea; H, hypoxic episode.