Figure 1
From: Predicting muscle forces of individuals with hemiparesis following stroke
Schematic representations of the three stimulation train patterns used in this study. Top line: a 20-Hz constant-frequency train (CFT) with all the pulses spaced equally by 50-ms; Middle line: a 20-Hz variable-frequency train (VFT) with a 5-ms inter-pulse interval (doublet) inserted in the beginning of a 20-Hz CFT; Bottom line: a 20-Hz doublet-frequency train (DFT) with doublets (2 pulses with a 5-ms inter-pulse interval) spaced equally by 95-ms. All the trains were either 1-sec in duration or contained 50-pulses, whichever occurred first (See text for details).