. 1999 Sep 1;519(Pt 2):571–579. doi: 10.1111/j.1469-7793.1999.0571m.x

Table 3.

Cardio-respiratory responses during repetitive hypoxia: number of exposures to hypoxia

	Quiet sleep				Active sleep

	1–10	11–20	21–30	31–40	1–10	11–20	21–30	31–40
ΔV (%)	144 ± 30 ^‡	140 ± 35 ^‡	131 ± 21^‡	146 ± 41 ^‡	88 ± 15 ^‡	39 ± 10^†^‡	50 ± 9 ^†^‡	41 ± 9 ^†^‡
ΔA (%)	73 ± 16^‡	74 ± 21^‡	68 ± 15^‡	83 ± 29^‡	50 ± 12^‡	25 ± 8^†^‡	34 ± 7^‡	30 ± 8^‡
Δf (%)	37 ± 5^‡	34 ± 4^‡	36 ± 4^‡	36 ± 6^‡	20 ± 4^‡	12 ± 3^‡	13 ± 4^‡	9 ± 4
ΔBP (%)	3 ± 1^‡	3 ± 1^‡	3 ± 1^‡	3 ± 1^‡	5 ± 1^‡	0 ± 1^†	4 ± 1	2 ± 2
ΔHR(%)	4 ± 1^‡	3 ± 1^‡	2 ± 1^‡	4 ± 1^‡	−3 ± 1	−2 ± 2	0 ± 1	−2 ± 2
S_p,O₂(%)	84 ± 2^‡	85 ± 2^‡	87 ± 2^‡	87 ± 2^‡	82 ± 2^‡	83 ± 2^‡	81 ± 2^‡	81 ± 3^‡

Values are means ±s.e.m., n = 9 lambs. Values are expressed as a percentage change from normoxia for the following: ΔV, change in ventilation; ΔA, change in respiratory amplitude; Δf, change in respiratory frequency; ΔBP, change in mean arterial blood pressure; ΔHR, change in heart rate. S_p,O₂, pulse oxygen saturation.

^†

P <0.05, value vs. 1–10 exposures (ANOVA and Student-Newman-Keuls post hoc test).

^‡

P < 0.05, value vs. normoxia (ANOVA and Student-Newman-Keuls post hoc test).