Figure 10.

Progressive increase in extra and peak forces with repeated top hat stimulations and staircase phenomenon after transecting the sciatic nerve in two adult decerebrate cats. A, The LGS nerve was stimulated (2 ms pulse widths) at variable frequencies during a 30 s period after transecting the sciatic nerve. The extra forces (i.e., the forces produced during the last 1.5 s of the 20 Hz stimulations; the period is indicated by vertical dotted lines) and the peak forces produced with each 2 s 40 Hz stimulation expressed as a percentage of first 20 Hz stimulation (i.e., for extra forces) and the first 40 Hz stimulation (i.e., for peak forces) are shown above the trace. B, The LGS nerve was stimulated at 40 Hz for 20 s after transecting the nerve. The EMG of the LG muscle evoked by stimulation is shown below the force trace.