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. 2006 Mar 2;573(Pt 1):161–171. doi: 10.1113/jphysiol.2005.103044

Figure 1. Fatigue of a paralysed motor unit.

Figure 1

A, trains of EMG potentials evoked by 13 pulses at 40 Hz at the start of the fatigue test (0 s) and after 60 s and 120 s of stimulation. B, overlays of the first and last potentials of each train at 0 s, 60 s and 120 s. The arrow indicates the time of stimulation. C, corresponding 40 Hz forces. D, reduction in force during fatigue measured every 5 s to show that gradual changes occurred. E, initial, post-tetanic, and post-fatigue EMG potentials and twitch force of the same unit.