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Table 4 Normalized surface electromyography results as percentage (Psychophysiological measures)

From: Muscle activity and acute stress in fibromyalgia

  FM
(n = 51)
Control
(n = 31)
p-value
Trapezius, left
 Mean (SD) 1.6 (1.7) 0.6 (0.5) < 0.001
 Median [Min, Max] 1.0 [0.2, 8.0] 0.4 [0.1, 2.0]  
Trapezius, right
 Mean (SD) 1.5 (1.2) 0.7 (0.5) < 0.001
 Median [Min, Max] 1.0 [0.2, 5.5] 0.7 [0.1, 2.1]  
Erector spinae, left
 Mean (SD) 4.0 (3.3) 2.2 (1.8) 0.002
 Median [Min, Max] 3.0 [0.1, 12.8] 1.6 [0.4, 7.9]  
Erector spinae, right
 Mean (SD) 4.1 (4.2) 2.0 (1.2) 0.001
 Median [Min, Max] 2.4 [0.5, 19.1] 1.7 [0.6, 5.1]  
Biceps brachii, left
 Mean (SD) 1.0 (0.8) 0.4 (0.3) < 0.001
 Median [Min, Max] 0.8 [0.2, 3.3] 0.4 [0.1, 1.4]  
Biceps brachii, right
 Mean (SD) 1.0 (0.8) 0.4 (0.4) < 0.001
 Median [Min, Max] 0.8 [0.1, 3.9] 0.4 [0.1, 2.0]  
  1. FM Fibromyalgia patients, SD standard deviation