Table 3 Secondary outcomes—effect of treatment on intracortical Inhibition according to intervention groups.

From: Cortical excitability and analgesic effects of multisite transcranial direct current stimulation targeting the motor cortex and cerebellum in fibromyalgia

 

Mean (SD) before (B) treatment

Mean (SD) after (A) treatment

∆-value (A-B)

Beta

SEM

CI 95%

Wald χ2

df

P

Intra-cortical inhibition

 a-tDCS

0.51 (0.32)

0.50 (0.35)

− 0.02 (0.32)

0.10

0.005

(− 0.05 to 0.85)

0.08

1

0.77

 s-tDCS

0.56 (0.0.29)

0.53 (1.02)

0.03 (0.33)reference

      

 Adjusted serum BDNF index

   

0.004

0.007

(− 0.01 to 0.02)

0.27

1

0.60

Site of stimulation

 a-tDCS CB + M1

0.53 (0.27)

0.50 (0.26)

− 0.05 (0.23)

− 0.03

0.08

(− 0.13 to 0.19)

0.01

1

0.91

 a-tDCS M1

0.44 (0.23)

0.39 (0.17)

− 0.09 (0.28)

− 0.05

0.06

(− 0.08 to 0.18)

 

1

 

 a-tDCS CB

0.58 (0.41)

0.64 (0.51)

0.12 (0.39)

0.06

0.15

(− 0.35 to 0.23)

 

1

 

 s-tDCS M1+ CB

0.53 (0.29)

0.52 (0.31)

0.01 (0.33) reference

      

Main effect of intervention: Wald χ2=6.90; Df=2; P=0.03

    

Cortical salient period

    

 a-tDCS

125.63 (40.25)

121.67 (33.81)

− 3.57 (34.65)

27.83

8.66

(− 44.81 to − 10.85)

10.32

1

0.00

 s-tDCS

111.29 (25.85)

129.22 (40.19)

17.93 (27.34)reference

      

 Adjusted serum BDNF index

   

− 0.11

0.83

(− 18.50 to 20.46)

0.01

1

0.92

Site of stimulation

    

 a-tDCS CB + M1

123.92 (33.46)

121.62 (33.26)

− 2.30 (27.52)

− 20.24

8.76

(− 27.24 to − 3.24)

11.71

2

<0.01

 a-tDCS M1

128.20 (47.20)

123.61 (46.18)

− 4.59 (25.98)

− 22.53

8.43

(− 39.06 to − 6.00)

   

 a-tDCS CB

124.10 (39.15)

114.74 (29.27)

− 9.36 (28.15)

− 27.30

8.77

(− 44.50 to − 10.10)

   

 s-tDCS M1+ CB

111.28 (25.85)

129.22 (40.36)

17.94 (27.34) reference

      
  1. Data are presented as mean ± standard deviation (SD) from pre- to post-intervention, along with the mean difference and 95% confidence intervals (CI) (n = 92).
  2. a-tDCS anodal transcranial direct current stimulation, s-tDCS sham stimulation, BDNF brain-derived neurotrophic factor, M1 primary motor cortex, CB cerebellum.