MEPs and H-reflexes (A–C) were obtained from passive FCR at baseline and 0, 15 and 30 minutes after 20 minutes of active-passive movement made in either a mirror symmetric or alternating pattern.

<p>The only difference between sessions was the phase relation of the active hand with respect to the passive hand. <b>A.</b> Intracortical Inhibition Protocols (Top to Bottom): Single-pulse TMS of left M1 elicits a non-conditioned MEP. The test stimulus intensity is set to produce an MEP roughly half of the maximum amplitude obtainable in that muscle. Long interval intracortical inhibition (LICI, Exp 1) was examined with two supra-threshold stimuli applied 100 ms apart. Short interval afferent inhibition (SAI, Exp 1) was examined by applying cutaneous stimulation through ring electrode on the right index finger 40 ms prior to TMS at the test intensity. Short interval intracortical inhibition (SICI, Exp 5) was examined by applying a subthreshold stimulus 2 ms before the test stimulus. Suppression of the test MEP is evident during LICI, SAI and SICI protocols. Each trace is the average of twenty sweeps. <b>B.</b> Interhemispheric Inhibition. Top: Single-pulse TMS of left M1 elicits a test MEP in pre-activated right FCR. Bottom: To examine interhemispheric inhibition (IHI, Exp 2), TMS of right M1 is applied 10 ms before TMS of left M1. Suppression of the test MEP is evident. Each trace is the average of twenty sweeps. <b>C.</b> H-Reflex. H-reflexes were obtained in the resting right FCR (Exp 3). The stimulus artefact is followed closely by an M-wave that is approximately 10% of the maximum M-wave amplitude (not shown), followed by the H-wave. The trace is an average of thirty sweeps.