Table 2.
Cortical excitability parameters presented by chronic pain syndrome (CPS).
| Chronic pain syndrome | ||||
|---|---|---|---|---|
| Fibromyalgia (n = 19) | Myofascial pain syndrome (n = 54) | Osteoarthritis (n = 27) | Healthy subjects (n = 14) | |
| Motor evoked potential (mV) | 1.13 (0.11)a | 1.64 (0.49)c | 1.46 (0.62)b | 1.25 (0.38)a |
| Short intracortical facilitation (ratio: SICF/test stimulus) | 0.96 (0.44)c | 1.13 (0.23)c | 0.97 (0.41)c | 0.71 (0.36)a |
| Short interval intracortical inhibition (ratio: SICI/test stimulus) | 0.32 (0.22)c | 0.31 (0.17)c | 0.59 (0.30)b | 0.92 (0.07)a |
| Cortical silent period (CSP) | 68.07 (18.43)c | 68.44 (20.55)c | 62.20 (16.68)b,c | 76.67 (21.35)a |
Data are presented as mean (SD; n = 114). Different superscripts (a, b, c) indicate significant difference among treatment groups after post hoc analysis adjusted by Bonferroni (P < 0.05). Analysis of variance (ANOVA) to compare mean (SD).