Table 4.
Δ from normoxia rest | |||||
---|---|---|---|---|---|
Rest | 10% | 20% | 10% | 20% | |
Forearm blood flow (ml min−1) | |||||
Control | |||||
Normoxia† | 62 ± 11 | 189 ± 23 | 350 ± 40 | 126 ± 16 | 287 ± 35 |
Hypoxia*† | 76 ± 13 | 231 ± 39 | 409 ± 46 | 169 ± 30 | 346 ± 40 |
Phentolamine | |||||
Normoxia† | 224 ± 20‡ | 356 ± 31‡ | 502 ± 44‡ | 131 ± 21 | 286 ± 41 |
Hypoxia*† | 378 ± 39‡ | 509 ± 46‡ | 669 ± 33‡ | 306 ± 43‡ | 466 ± 57‡ |
Phentolamine/propranolol | |||||
Normoxia† | 280 ± 40‡ | 420 ± 51‡ | 593 ± 61‡ | 139 ± 25 | 312 ± 45 |
Hypoxia*† | 382 ± 46‡ | 494 ± 50‡ | 751 ± 42‡§ | 213 ± 25§ | 450 ± 43‡ |
Forearm vascular conductance (ml min−1 (100 mmHg)−1) | |||||
Control | |||||
Normoxia† | 73 ± 12 | 213 ± 26 | 387 ± 43 | 139 ± 18 | 314 ± 38 |
Hypoxia*† | 89 ± 16 | 263 ± 43 | 450 ± 47 | 190 ± 32 | 377 ± 40 |
Phentolamine | |||||
Normoxia† | 265 ± 24‡ | 411 ± 36‡ | 570 ± 53‡ | 147 ± 25 | 315 ± 50 |
Hypoxia*† | 448 ± 46‡ | 591 ± 55‡ | 759 ± 69‡ | 354 ± 53‡ | 521 ± 63‡ |
Phentolamine/propranolol | |||||
Normoxia† | 325 ± 47‡ | 477 ± 58‡ | 652 ± 65‡ | 152 ± 29 | 326 ± 51 |
Hypoxia*† | 443 ± 55‡ | 565 ± 54‡ | 825 ± 52‡ | 240 ± 27§ | 479 ± 53‡ |
Values are mean ±s.e.m.
Main effect of hypoxia, P < 0.05
main effect of exercise, P < 0.05
P < 0.05 vs. control
P < 0.05 vs. phentolamine.