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

Vidor, Liliane Pinto; Torres, Iraci LS; Medeiros, Liciane Fernandes; Dussán-Sarria, Jairo Alberto; Dall’Agnol, Letizzia; Deitos, Alicia; Brietzke, Aline; Laste, Gabriela; Rozisky, Joanna R; Fregni, Felipe; Caumo, Wolnei

doi:10.1186/1471-2202-15-42

Table 4 Multivariate linear regression analysis of the relationship between trait anxiety and motor cortex excitability before QST evoked pain (n = 47)

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

Dependent variable	Type III sum of squares	df	Mean square error	F	P	Partial eta squared
Motor threshold	256.75	4	64.19	1.12	0.36	0.10
Motor evoked potential	1.93	4	0.48	0.87	0.48	0.08
Intracortical facilitation	6.25	4	1.56	5.69	0.001*	0.37
Short intracortical inhibition	0.228	4	0.057	3.61	0.01*	0.28
Cortical silent period	5466.5	4	1366	5.67	0.001*	0.37
	β	SEM	t		P	*Partial eta squared*
Motor threshold
Trait-anxiety	−0.06	0.17	−0.38		0.70	0.004
Age (years)	0.17	0.09	1.84		0.07	0.08
B-PCP:S	0.09	0.07	1.36		0.18	0.04
Motor evoked potential
Trait-anxiety	−0.02	0.02	−0.78		0.44	0.02
Age (years)	−0.01	0.009	−1.37		0.17	0.04
B-PCP:S	−0.007	0.007	−1.05		0.29	0.03
Intracortical Facilitation ^c
Trait-anxiety	0.05	0.012	4.06		0.00*	0.29
Age (years)	−0.008	0.007	−1.19		0.23	0.03
B-PCP:S	−0.004	0.005	−0.77		0.45	0.01
Short intracortical inhibition ^c
Trait-anxiety	0.001	0.003	0.32		0.75	0.003
Age (years)	0.00	0.002	0.21		0.83	0.001
B-PCP:S	−0.002	0.001	−1.21		0.23	0.04
Cortical silent period
Trait-anxiety	−1.17	0.39	−2.99		0.01*	0.18
Age (years)	-.013	0.22	−0.06		0.95	0.00
B-PCP:S	−0.163	0.16	−1.02		0.31	0.03
Dependent variable	Type III sum of squares	df	Mean square error	F	P	*Partial eta squared*
Motor evoked potential	10.48	3	3.49	4.93	0.13	0.12
Intracortical facilitation	4.27	3	1.42	5.08	0.004*	0.27
Short intracortical inhibition	0.04	3	0.012	0.31	0.81	0.02
Cortical silent period	2979.0	3	993.01	2.62	0.06	0.16
	β	SEM	t		P	*Partial Eta Squared*
Motor evoked potential
Trait-anxiety	−0.04	0.02	−2.01		0.05	0.09
Age (years)	−0.006	0.01	−0.53		0.59	0.01
B-PCP:S	−0.04	0.08	−0.28		0.78	0.01
Intracortical facilitation ^c
Trait-anxiety	0.04	0.01	3.09		0.01*	0.19
Age (years)	0.002	0.007	0.32		0.75	0.01
B-PCP:S	0.02	0.005	3.16		0.01*	0.19
Short intracortical inhibition ^c
Trait-anxiety	0.003	0.005	0.57		0.57	0.008
Age (years)	0.00	0.003	−0.07		0.95	0.001
B-PCP:S	−0.002	0.002	−0.88		0.38	0.01
Cortical silent period
Trait-anxiety	−1.23	0.45	−2.72		0.01*	0.15
Age (years)	−0.08	0.26	−0.31		0.75	0.002
B-PCP:S	0.05	0.18	0.25		0.80	0.001

^bProfile of Chronic Pain: Screen for a Brazilian population (B-PCP:S);^c(ratio: ICF/test stimulus; ratio: SICI/test stimulus). *P < 0.05

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ISSN: 1471-2202

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