Table 5.
Rest time of muscles: percentage of time when surface electromyography voltage < 0.5 % of maximum voluntary contraction (Psychophysiological measures)
| 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] | |
FM Fibromyalgia patients, SD standard deviation