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Table 2 Tests for differences between the chronic pain group (MYA) and controls (CON) in their subjective ratings, muscle activity and autonomic variables.

From: Physiological responses to low-force work and psychosocial stress in women with chronic trapezius myalgia

  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 <.001 b 7 (10)a 68 (38)a <.001 b 3 (10)a 72 (45)a .001 b
PAINclat (mm) 0 (0)a 20 (25)a <.001 b 0 (0)a 30 (36)a <.001 b 0 (0)a 30(49)a <.001 b
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 .013 b 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
  1. 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.