TABLE 1.

AVERAGE VALUES FOR EXPIRED VENTILATION RATE, V_T, BREATHING FREQUENCY, INTEGRATED GENIGLOSSUS MUSCLE EMG ACTIVITY, AND MEAN ARTERIAL BLOOD PRESSURE AT FIVE LEVELS OF INSPIRED CO₂

Inspired CO2 (%)	0	3	6	9	12	p Value
Ventilation, % baseline	100	120.8 ± 2.8*	140.2 ± 4.2*	163.8 ± 7.0*	181.0 ± 9.2*	< 0.001
Vt, % baseline	100	118.4 ± 1.6*	139.4 ± 3.3*	169.6 ± 6.0*	191.0 ± 7.3*	< 0.001
Frequency, min−1	115 ± 3.2	116.9 ± 3.4	115.4 ± 3.0	109.9 ± 3.0	106.9 ± 3.3	NS
Genioglossus iEMG, % baseline	100	108 ± 5.0	133.7 ± 8	166.5 ± 15.6*	179.1 ± 22.2*	< 0.001
MABP, mm Hg	87.8 ± 17.0	84.1 ± 17.3	86.5 ± 14.5	85.4 ± 15.2	86.9 ± 15.2	NS

Definition of abbreviations: iEMG = integrated EMG; MABP = mean arterial blood pressure; NS = not significant.

p values reflect the results of analysis of variance and appropriate post hoc analyses (see Methods and the online supplement).

^*p < 0.05 versus % inspired CO₂ = 0.