Figure 1

Crank Angle Diagram. Pre-programmed sensors were used to stimulate the appropriate muscles during specific phases of cycle rotation, using a sinusoidal, biphasic waveform with a pulse duration of 500 μsec, a phase duration of 1000 μsec and frequency of 50 Hz. Quadriceps and gluteus stimulation was initiated prior to reaching top dead center (TDC) during leg extension. Hamstring stimulation was applied through bottom dead center (BDC), during leg flexion. Stimulation was provided through individual stimulation channels.