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Table 5 Rest time of muscles: percentage of time when surface electromyography voltage < 0.5 % of maximum voluntary contraction (Psychophysiological measures)

From: Muscle activity and acute stress in fibromyalgia

  FM
(n = 51)
Control
(n = 31)
p-value
Trapezius, left
 Mean (SD) 35.4 (35.2) 66.4 (31.8) < 0.001
 Median [Min, Max] 23.6 [0.0, 97.5] 80.6 [0.2, 100]  
Trapezius, right
 Mean (SD) 35.6 (30.7) 59.6 (30.8) 0.001
 Median [Min, Max] 36.6 [0.1, 98.6] 57.4 [0.3, 100]  
Erector spinae, left
 Mean (SD) 5.4 (17.2) 7.1 (17.0) 0.658
 Median [Min, Max] 0.0 [0.0, 99.9] 0.3 [0.0, 79.2]  
Erector spinae, right    
 Mean (SD) 4.1 (11.2) 4.3 (8.8) 0.945
 Median [Min, Max] 0.1 [0.0, 62.2] 0.6 [0.0, 43.6]  
Biceps brachii, left
 Mean (SD) 40.0 (35.4) 71.1 (27.9) < 0.001
 Median [Min, Max] 30.5 [0.0, 99.9] 80.3 [17.6, 100]  
Biceps brachii, right
 Mean (SD) 40.0 (36.2) 74.6 (27.5) < 0.001
 Median [Min, Max] 32.4 [0.0, 99.9] 83.6 [11.6, 100]  
  1. FM Fibromyalgia patients, SD standard deviation