Figure 2. Force record during and following isovelocity stretches at 76.4 deg s⁻¹.

Angular displacement (top) and force data (bottom) for one subject. Stimulation (indicated by the bars above the time axis) was either at 80 Hz (traces 1 and 2) or 30 Hz (traces 3 and 4). Vertical dotted lines indicate where the forces were measured, before (F_before), at the peak (F_peak) and 500 ms following the stretch (F_after). The thick traces are the force responses before, during and after stretches from 44 to 63 deg thumb angle at 76.4 deg s⁻¹. Note that with both the 80 and 30 Hz stimulation, the isometric force after the stretch (F_after) was enhanced compared to the isometric forces at the 63 deg thumb angle without a preceding stretch (thin traces).