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. 2003 Aug 1;552(Pt 2):657–664. doi: 10.1113/jphysiol.2003.048132

Figure 2. Representative example of a series of ISI histograms derived from a single motor unit.

Figure 2

A, raw ISI histogram containing all intervals from the trial. B-D, sliced histograms extracted from A illustrating the ISI characteristics during the fastest (B), middle (C) and slowest (D) periods of motor unit discharge. The histogram in D gives rise to the plateau of the final compound trajectory (see Fig. 3A). Due to the comparatively smaller number of ISIs contained in the histogram in D (i.e. particularly above ≈200 ms), caution needs to be exercised when fitting the final compound trajectory. See text for further details.