Table 1.
Cardiorespiratory variables during the experiment.
| Resting (n = 26/14) | Hyperventilation (n = 17/9) | Post-acetazolamide (n = 19/10) | |
|---|---|---|---|
| Heart rate (min−1) | 59.4 ± 8.3 | 66.8 ± 9.4a | 64.4 ± 10.9 |
| Respiratory rate (min−1) | 16.4 ± 2.0 | 24.2 ± 0.4a | 17.6 ± 1.8 |
| pH | 7.40 ± 0.01 | 7.54 ± 0.07a | 7.39 ± 0.03 |
| PaCO2 (kPa) | 5.8 ± 0.4 | 3.7 ± 0.8a | 5.5 ± 0.3a |
| PaO2 (kPa) | 13.8 ± 0.9 | 16.8 ± 1.6a | 14.0 ± 1.0 |
| ctHB (mmol/L) | 9.6 ± 0.7 | 9.4 ± 0.4 | 9.3 ± 0.4 |
| SaO2 (%) | 97.8 ± 0.4 | 99 ± 0.4 | 97.7 ± 0.4 |
Note: Values are the average ± standard deviations of the two measurements in each condition. For each state, n indicates the number of observations/number of subjects.
a
p < 0.005 for difference versus resting conditions.
PaCO2: arterial pressure of CO2; PaO2: arterial pressure of O2; ctHB: concentration of hemoglobin; SaO2: arterial saturation of O2.