Table 2.
Tests for differences between the chronic pain group (MYA) and controls (CON) in their subjective ratings, muscle activity and autonomic variables.
| Baseline | Overall mean | TSST | |||||||
| Measure |
CON Mean (SD) |
MYA Mean (SD) |
p-value |
CON Mean (SD) |
MYA Mean (SD) |
p-value |
CON Mean (SD) |
MYA Mean (SD) |
p-value |
|
PAINdomp (mm) |
4 (10)a | 50 (39)a | <.001b | 7 (10)a | 68 (38)a | <.001b | 3 (10)a | 72 (45)a | .001b |
|
PAINclat (mm) |
0 (0)a | 20 (25)a | <.001b | 0 (0)a | 30 (36)a | <.001b | 0 (0)a | 30(49)a | <.001b |
|
Stress (S-E score) |
.7 (.5) | 1.5 (.8) | <.001 | 1.5 (.5) | 2.2 (.5) | <.001 | 3.6 (1) | 3.7 (.9) | >.3 |
|
Energy (S-E score) |
1.9 (.9) | 1.9 (.6) | >.3 | 2.6 (.5) | 2.5 (.4) | >.3 | 3.4 (.6) | 2.9 (.8) | .015 |
|
EMGtrap (μV) |
10.4 (17)a | 25.9 (35)a | .013b | 37.6 (42)a | 56.3 (58)a | .055b | 17.1(41)a | 23.2 (28)a | >.3b |
|
EMGdelt (μV) |
8.8 (15)a | 11.8 (27)a | .103b | 32.5 (22)a | 44.7 (42)a | >.3b | 10.1 (9)a | 10.8 (31)a | >.3b |
|
HR (beats/min) |
66.3 (8.3) | 72.7 (8.0) | .013 | 77.9 (8.1) | 80.5 (10.9) | >.3 | 94.6 (16) | 93.2 (23) | >.3 |
|
SCL (μS) |
5.0 (4.2) | 5.9 (5.6) | >.3 | 10.5 (4.5) | 11.4 (2.9) | >.3 | 14.1 (5) | 16.6 (5) | .123 |
|
Resp (breaths/min) |
16.3 (2.2) | 16.7 (1.8) | >.3 | 17.5 (1.9) | 17.5 (1.5) | >.3 | 15.6 (2) | 15.1 (2) | >.3 |
|
MAP (mmHg) |
88.3 (7.7) | 86.8 (9.4) | >.3 | 93.5 (6.7) | 93.3 (10.4) | >.3 | 108.6 (12) | 106.9 (16) | >.3 |
Note: aMedian (interquartile distance); bMann-Whitney U-test; domp = dominant/most painful trapezius; clat = contralateral trapezius; EMGtrap = trapezius muscle activity; EMGdelt = deltoid muscle activity; HR = heart rate; SCL = skin conductance level; Resp = respiration rate; MAP = mean arterial pressure.