Table 3.
Raw data from Initial Baseline and End Points under different steady-state brainstem PCO2 conditions from Experiment 2, Intermittent Hypoxia
| Respiratory variable | Baseline | End Point |
|---|---|---|
| 30 Torr PCO2 brainstem n = 9 | ||
| fR (min−1) | 33.42 ± 3.31 | 33.31 ± 4.52 |
| TI (s) | 0.81 ± 0.05 | 0.88 ± 0.06 |
| TE (s) | 1.19 ± 0.26 | 1.58 ± 0.6 |
| EI | 0.72 ± 0.027 | 0.76 ± 0.031*,3 |
| 50 Torr PCO2 brainstem n = 6 | ||
| fR (min−1) | 29.43 ± 1.73 | 31.53 ± 2.33 |
| TI (s) | 0.59 ± 0.05+,3 | 0.61 ± 0.034 |
| TE (s) | 1.51 ± 0.164 | 1.37 ± 0.17*,3 |
| EI | 0.72 ± 0.019 | 0.74 ± 0.012 |
These data illustrate the phrenic neurogram characteristics during the baseline period prior to and during a washout period following the experimental perturbation. Note that the baseline frequency is no different under any brainstem PCO2 condition.
*
End Point variable is significantly different than the same variable for Baseline.
+
Variable at 50 Torr PCO2 brainstem is significantly different than the same variable under conditions of 30 Torr PCO2 brainstem. nVT and nVE were not compared because these values contain arbitrary units (a.u.) and these two data sets are from different animals.