Association of anxiety with intracortical inhibition and descending pain modulation in chronic myofascial pain syndrome

Table 1 Linear regression of the relationship between cortical excitability parameters and potential confounding factors (n = 47)

Parameter	SEM	β^a	t	P
Motor Threshold
Age (years)	0.09	0.31	2.15	0.03
Short Intracortical inhibition (ratio: SICI/test stimulus)
Brazilian Portuguese Catastrophizing Scale (B-PCS)	−0.005	−0.44	−3.24	0.002
Intracortical facilitation
(ratio: ICF/test stimulus)
Trait-anxiety	0.011	0.56	4.48	0.001
Cortical silent period
Trait-anxiety	0.39	−0.41	−2.95	0.005

^a Value adjusted by multiple regression analysis with a stepwise forward method controlling for collinearity. The covariates included in each model were: state-trait anxiety, pain-related catastrophic thinking, depressive symptoms and age.

ISSN: 1471-2202