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. 2007 Sep 20;586(Pt 5):1277–1289. doi: 10.1113/jphysiol.2007.140426

Figure 2. EMG responses in relaxed biceps of a typical subject.

Figure 2

Responses are shown before (baseline), during (pain), and after (recovery) activation of group III and IV muscle afferents produced by infusion of hypertonic saline into biceps. A, single subject data showing superimposed EMG responses in relaxed biceps to stimulation of the motor cortex (MEPs; upper traces) and the corticospinal tract (CMEPs; lower traces). Dashed horizontal lines indicate peak responses. B, corresponding data for the same subject plotted as areas of MEPs (○) and CMEPs (•). During the infusion of hypertonic saline, the average pain intensity rating for this subject was 4 out of 10 (‘moderate’ to ‘considerable’) and this rating returned to 0 before the recovery stage.