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Table 3 Absolute surface electromyography results in µV during the measurement and the maximum voluntary contractions (Psychophysiological measures)

From: Muscle activity and acute stress in fibromyalgia

  FM
(n = 51)
Control
(n = 31)
p-value
Trapezius, left
 Mean (SD) 6.3 (8.5) 3.5 (1.9) 0.027
 Median [Min, Max] 3.2 [1.6, 57.1] 2.8 [1.6, 11.1]  
Trapezius, right
 Mean (SD) 7.7 (8.2) 5.2 (4.4) 0.082
 Median [Min, Max] 3.8 [2.2, 42.5] 3.1 [1.8, 20.7]  
Erector spinae, left
 Mean (SD) 2.4 (1.3) 2.1 (1.9) 0.499
 Median [Min, Max] 1.9 [1.1, 6.8] 1.7 [1.0, 12.4]  
Erector spinae, right
 Mean (SD) 2.4 (1.3) 2.3 (1.0) 0.635
 Median [Min, Max] 2.1 [1.1, 9.4] 2.0 [1.0, 5.5]  
Biceps brachii, left
 Mean (SD) 2.9 (1.3) 2.6 (1.3) 0.346
 Median [Min, Max] 2.6 [1.6, 8.2] 2.4 [1.2, 7.1]  
Biceps brachii, right
 Mean (SD) 2.9 (1.8) 2.1 (1.1) 0.014
 Median [Min, Max] 2.3 [1.1, 10.7] 1.9 [1.0, 6.9]  
MVC trapezius, left
 Mean (SD) 531 (406) 887 (567) 0.004
 Median [Min, Max] 433 [82.5, 2510] 766 [133, 2460]  
MVC trapezius, right
 Mean (SD) 588 (378) 890 (542) 0.009
 Median [Min, Max] 561 [115, 2290] 669 [109, 2080]  
MVC erector spinae, left
 Mean (SD) 125 (187) 128 (67.8) 0.926
 Median [Min, Max] 84.8 [15.2, 1300] 109 [26.7, 306]  
MVC erector spinae, right
 Mean (SD) 109 (87.2) 139 (62.0) 0.0778
 Median [Min, Max] 84.0 [11.4, 442] 128 [44.9, 311]  
MVC biceps brachii, left
 Mean (SD) 457 (329) 768 (401) < 0.001
 Median [Min, Max] 365 [95.0, 1420] 772 [241, 1830]  
MVC biceps brachii, right
 Mean (SD) 442 (335) 720 (430) 0.003
 Median [Min, Max] 323 [57.7, 1500] 638 [167, 1910]  
  1. FM Fibromyalgia patients, MVC Maximum voluntary contraction, SD Standard deviation