Table 1.
Means (Standard Error) for pain ratings and nociceptive flexion reflex (NFR) activity at both electrocutaneous pain threshold and tolerance levels following placebo and naltrexone administration.
| Threshold | Tolerance | |||
|---|---|---|---|---|
| Placebo | Naltrexone | Placebo | Naltrexone | |
| M (SE) | M (SE) | M (SE) | M (SE) | |
| Pain Rating (1-100) | ||||
| Men | 45.0 (1.2) | 41.0 (1.3) | 85.3 (2.2) | 81.5 (2.3) |
| Women | 44.9 (1.3) | 43.3 (1.4) | 86.0 (2.4) | 80.2 (2.6) |
| All | 44.9 (0.9) | 42.1 (0.9) | 85.6 (1.6) | 80.8 (1.7) |
| NFR Activity (μV) | ||||
| Men | 37.7 (4.6) | 33.3 (3.9) | 77.6 (7.5) | 70.4 (7.5) |
| Women | 40.0 (5.1) | 24.3 (4.4) | 64.3 (8.2) | 44.7 (8.3) |
| All | 38.8 (3.4) | 29.3 (2.9) | 71.6 (5.5) | 58.8 (5.6) |