Table 4.
Arterial and venous norepinephrine at rest, adenosine administration (normoxia only), and increasing exercise intensity
| Normoxia | Hypoxia | |||||||
|---|---|---|---|---|---|---|---|---|
| Rest | 10% | 20% | Ado low | Ado high | Rest | 10% | 20% | |
| Pretyramine | ||||||||
| Arterial norepinephrine | 121±16 | 129±15 | 135±17 | 134±17 | 140±20 | 120±13 | 146±21 | 193±38 |
| Venous norepinephrine | 176±25 | 160±15 | 171±19 | 172±21 | 170±19 | 189±21 | 187±24 | 200±28 |
| Venoarterial norepineprine | 55±20 | 31±7 | 35±7 | 39±6 | 30±9 | 69±14 | 41±10 | 34±12 |
| Tyramine | ||||||||
| Arterial norepinephrine | 131±16 | 137±14 | 170±20 | 135±17 | 128±19 | 124±11 | 155±19 | 205±37 |
| Venous norepinephrine | 369±70* | 462±47* | 396±37* | 378±51* | 320±26* | 411±58* | 511±79* | 483±67* |
| Venoarterial norepineprine difference | 238±60* | 325±46* | 226±31* | 243±49* | 191±24* | 287±48* | 348±70* | 278±54* |
Values are means ± SE given in pg/ml. Ado, adenosine.
*
P < 0.01 vs. pretyramine.