Table 2.

Short-interval intracortical inhibition stimulation parameters

	Rest	Index Finger Abduction 70% MVC	Rest	Elbow Flexion 70% MVC	P Values
Healthy control
Unadjusted
TS, %	58.6 ± 11.0		57.6 ± 10.6		0.76
CS, %	36.5 ± 9.6		37.4 ± 9.2		0.35
Test MEP, mV	1.2 ± 0.6	2.4 ± 1.6	1.2 ± 0.6	1.5 ± 0.8	0.01
Adjusted
TS, %		53.0 ± 9.6		56.2 ± 10.8	0.06
Test MEP, mV		1.3 ± 0.5		1.2 ± 0.6	0.98
Cervical SCI
Unadjusted
TS, %	62.7 ± 14.0		67.0 ± 17.9		0.20
CS, %	41.3 ± 11.3		40.4 ± 11.5		0.22
Test MEP, mV	1.2 ± 1.4	1.3 ± 1.5	0.9 ± 1.3	0.9 ± 1.5	0.60

Values are mean ± SD stimulus intensity used for the test stimulus (TS) and the conditioning stimulus (CS) during short-interval intracortical inhibition (SICI) measurements. In both groups measurements were completed without adjusting (Unadjusted) the size of the test motor evoked potential (MEP) in the resting first dorsal interosseous (FDI) while the contralateral side performed 70% of MVC during index finger abduction or elbow flexion. Note that the same stimulus intensity was used across conditions. SICI was also measured by adjusting (Adjusted) the size of the test MEP in healthy control subjects. Here, the intensity of the TS was reduced to acquire a similar test MEP size across conditions. Note that in the Adjusted condition there were no differences in the size of the test MEP across conditions. P values represent t-tests and ANOVAs performed on test and conditioning MEP.