Table 2.
Quantitative Sensory Testing (QST) measures by group[Mean (SD)]
| QST Measures | SCD (n = 83) |
Healthy Control (n=27) |
|---|---|---|
| Thermal Pain in °Celsius | ||
| Threshold (HPTh) | 40.7 (2.8) | 41.8 (2.9) |
| Tolerance (HPTo) | 44.0 (2.0) | 46.5 (2.2)*** |
| Pressure Pain Threshold in kilopascals (kPa) | ||
| Trapezius | 246.1 (99.1) | 310.9 (139.9)** |
| Thumb | 301.5 (100.0) | 357.0 (112)* |
| Forearm | 239.5 (102.3) | 279.1 (117.2) |
| Quadriceps | 520.7 (230.0) | 625.5 (252.7)* |
| Thermal Temporal Summation difference scores | ||
| At Heat Pain Threshold | 3.6 (7.2) | 2.2 (5.6) |
| At Threshold + 2°C | 3.8 (8.2) | 4.8 (9.7) |
| At 45°C | 8.0 (14.2) | 1.8 (3.5)* |
| After Sensation Ratings (TTS) | 11.8 (17.3) | 6.4 (11.8) |
| Mechanical Temporal Summation difference scores | ||
| 128 mN (Probe 5) | 12.8 (17.0) | 8.3 (13.2) |
| 256 mN (Probe 6) | 16.9 (19.1) | 10.7 (11.3) |
| Hot Water Hand Immersion Tests | ||
| Temperature of Hot Water (in °Celsius) | 45.2 (1.4) | 48.4 (1.1)*** |
| CPM Difference Trapezius (difference score) | 71.4 (64.3) | 37.6 (68.9)* |
| Hot Water Pain Ratings (0–100) | 56.0 (26.3) | 74.4 (19.1)*** |
| Hot Water Tolerance (in seconds) | 47.3(32.4) | 32.3 (28.2)* |
| After Sensation Ratings (hot water; 0–100) | 8.7 (12.8) | 17.5 (19.9)** |
*
(p<.05),
**
(p<.01).
Measures are reported as mean (SD). Difference Scores represent the maximal rated pulse (for Thermal Temporal Summation) or following the train of 10 stimuli (for Mechanical Temporal Summation) of the series minus first pulse of the series. CPM: Conditioned Pain Modulation. CPM Difference represents pressure pain thresholds at the trapezius obtained during water immersion of the hand minus baseline trapezius pressure pain thresholds.