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. 2008 Sep 11;586(Pt 21):5147–5159. doi: 10.1113/jphysiol.2008.158956

Figure 6. Effects of different levels of contraction on SICF.

Figure 6

Those ISIs where significant facilitatory peaks were previously found (Expt 5a, Fig. 6) were tested in four subjects. Three contraction levels (A: 10% MVC; B: 25% MVC; C: 50% MVC) were evaluated. For each of these levels of contraction, two S2 intensities, 90% AMT (black line) and 70% AMT (grey line), were evaluated. S1 was kept constant at 1 mV. Only using a S2 of 90% AMT was a MEP facilitation seen at 10% and 25% MVC. This facilitation was gradually reduced in amplitude with increasing contraction level and disappeared at 50% MVC. With a S2 of 70% AMT no significant facilitation was observed at any contraction level. Abscissa reports ISIs; the ordinate reports conditioned MEP amplitude which is expressed as a percentage value of the control MEP (S1). The thin horizontal line indicates the 100% level. Error bars represent s.e.m.