Table 5.
Blood analyte and oxygen delivery responses at baseline and at termination of LBNP and blood loss protocols
| Baseline | Termination | |
|---|---|---|
| Norepinephrine (pg/ml) | ||
| LBNP | 148 ± 20 | 354 ± 44† |
| BL | 155 ± 22 | 211 ± 29‡ |
| Epinephrine (pg/ml) | ||
| LBNP | 53 ± 7 | 144 ± 30* |
| BL | 49 ± 7 | 103 ± 19* |
| Hematocrit (%) | ||
| LBNP | 40.8 ± 0.8 | 42.4 ± 0.8† |
| BL | 41.1 ± 0.8 | 40.3 ± 0.9†‡ |
| Hemoglobin (g/dl) | ||
| LBNP | 14.2 ± 0.4 | 14.7 ± 0.4† |
| BL | 14.3 ± 0.4 | 14.0 ± 0.4†‡ |
| Oxygen (mmHg) | ||
| LBNP | 99.5 ± 2.9 | 97.8 ± 3.1 |
| BL | 105.1 ± 3.5 | 103.8 ± 2.7 |
| CO2 (mmHg) | ||
| LBNP | 42.1 ± 0.9 | 41.7 ± 1.0 |
| BL | 41.5 ± 0.6 | 41.0 ± 0.7 |
| pH | ||
| LBNP | 7.42 ± 0.01 | 7.41 ± 0.01 |
| BL | 7.42 ± 0.01 | 7.42 ± 0.01 |
| Bicarbonate (mmol/liter) | ||
| LBNP | 26.2 ± 0.2 | 25.8 ± 0.4* |
| BL | 26.2 ± 0.3 | 25.8 ± 0.3* |
| Arginine vasopressin (pg/ml) | ||
| LBNP | 2.8 ± 0.7 | 19.1 ± 6.2* |
| BL | 3.4 ± 0.7 | 13.5 ± 4.0* |
| Oxygen delivery (ml/min) | ||
| LBNP | 948 ± 57 | 809 ± 32* |
| BL‡ | 1036 ± 59 | 926 ± 37* |
Values are means ± SE, n = 12.
*
Stage main effect, different from baseline, P < 0.05;
†
different from baseline, P < 0.05;
‡
different from LBNP, P < 0.05.