Table 1.

Results of grouped data for timing, ventilation, and resistance during room air control and sustained hyperoxia

Variables	Control	Sustained Hyperoxia
Ti, s	2.1 ± 0.1	2.1 ± 0.1
Te, s	2.2 ± 0.1	2.0 ± 0.1
fR, breaths/min	14.6 ± 0.8	15.0 ± 0.8
PetCO2, Torr	41.5 ± 0.8	39.1 ± 0.8†
Vt, liter	0.436 ± 0.03	0.507 ± 0.03*
V̇i, l/min	6.2 ± 0.5	7.5 ± 0.6*
RUA, l·s−1·cmH2O−1	9.7 ± 1.1	7.1 ± 1.3
SaO2, %	96.5.±1.1	98.8 ± 0.6†
FiO2, %	20.1 ± 0.8	74.2 ± 9.7‡

Values are means ± SE; n = 10 subjects (see text for details). Ti, inspiratory time; Te, expiratory time; f_R, frequency of breathing; Pet_CO2, end-tidal Pco₂ level; Vt, tidal volume; V̇i, minute ventilation; R_UA, upper airway resistance; Sa_O2, oxygen saturation; Fi_O2, fraction of inspired O₂.

^*P < 0.05,

^†P < 0.01, and

^‡P < 0.001vs. control.