PMC6123898_01
Surface EMG records of leg muscles during and after voluntary muscle contraction. Note the repetitive EMG discharges of small amplitude, corresponding to fasciculation (white arrow), in the gracilis muscles bilaterally during knee flexion and in the right vastus lateralis (Rt. VL) muscle during knee extension. Immediately following the end of the knee movement, EMG discharges of large amplitude appeared in the VL muscles bilaterally and in the left gracilis muscle and remained for a few seconds, which corresponded to myoclonus (black arrowhead).
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The surface EMG of the thigh muscles at rest showed occasional small discharges of different waveforms corresponding to fasciculation (Fig. 1). After cessation of the voluntary muscle contraction, the involuntary EMG discharges became more distinguishable from the discharges associated with voluntary muscle contraction and remained for a few seconds (Fig. 1).