Table 4.

Stimulation, recording, and mechanical characteristics to determine interhemispheric inhibition during wrist flexion with lengthening and shortening contraction.

			50%MVC		90%MVC
Variable		Rest	L	S	L	S
CCS, mV	Mean	0.46	0.47	0.44	0.42	0.44
	±SD	0.12	0.12	0.09	0.13	0.07
TS, mV	Mean	0.29	0.33	0.35	0.30	0.31
	±SD	0.05	0.19	0.16	0.14	0.13
Position, °	Mean		−0.23	−0.14	−0.27	0.11
	±SD		0.33	0.23	0.14	0.20
Force, N	Mean		50.0	52.7	88.2	90.0
	±SD		4.13	11.04	9.62	22.21
EMG, %	Mean		41.7	50.6	89.9	93.2
	±SD		9.32	10.88	15.47	15.14
EMG, mV	Mean		0.004	0.005	0.004	0.004
	±SD		0.001	0.032	0.001	0.001

CCS, m V - contralateral conditioning stimulus delivered to the right M1; TS, mV - test stimulus delivered to the left M1; L and S, lengthening and shortening contraction of the left wrist flexors; Position, ° - position of the left wrist. Neutral position is 0° and positive values indicate flexion; Force, N - measured force in Newtons, matched between L and S at 50 and 90% of shortening MVC; EMG, % - EMG activity in the left FCR as a percent of EMG recorded during MVC