Table 2.
Plasma hormones during 60 min of cycling exercise in adrenalectomised subjects with saline (–ADR) or adrenaline (+ADR) infusion commencing at the onset of exercise
| Rest | 20 min | 45 min | 60 min | |
|---|---|---|---|---|
| Insulin (pmol l−1) | ||||
| −ADR | 87.8 ± 37.1 | 57.9 ± 22.8 | 43.0 ± 16.3 | 36.6 ± 10.6 |
| +ADR | 66.8 ± 23.1 | 62.2 ± 15.6 | 61.6 ± 14.5 | 32.1 ± 6.9 |
| Glucagon (ng l−1) | ||||
| −ADR | 62.6 ± 10.7 | 64.5 ± 11.8 | 69.4 ± 12.9 | 70.8 ± 11.8 |
| +ADR | 65.1 ± 10.7 | 75.0 ± 14.6 | 71.4 ± 15.4 | 78.1 ± 16.4 |
| G:I molar ratio | ||||
| −ADR | 0.35 ± 0.08 | 0.47 ± 0.09 | 0.63 ± 0.10 | 0.76 ± 0.15 |
| +ADR | 0.39 ± 0.08 | 0.46 ± 0.13 | 0.41 ± 0.11 | 0.90 ± 0.25 |
| Cortisol (nmol l−1) | ||||
| −ADR | 441 ± 120 | 411 ± 123 | 336 ± 102 | 298 ± 91 |
| +ADR | 428 ± 58 | 391 ± 57 | 333 ± 50 | 308 ± 50 |
| GH (ng ml−1) | ||||
| −ADR | 1.02 ± 0.44 | 5.32 ± 2.65 | 6.63 ± 2.53* | 6.59 ± 2.89* |
| +ADR | 1.18 ± 0.44 | 2.99 ± 1.40 | 2.22 ± 1.16 | 1.75 ± 0.76 |
Values are means ±s.e.m. (n = 6; except for growth hormone (GH), n = 5). NA, noradrenaline; G:I, glucagon:insulin.
*
Significantly different (P < 0.05) from +ADR.