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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