Fig. 3.

Normalized average muscle responses during sinusoidal hip movements while the sural nerve was not stimulated (A), or stimulated with the hip in extension (B) and in flexion (C). The top trace indicates the sinusoidal motion at the hip as recorded by the Biodex system. The vertical dotted lines in panels B and C indicate the position of the hip (0 s for mid-extension and 2.5 s for mid-flexion) during which the sural nerve was stimulated. It is clear that regardless the timing or the presence of the sural nerve stimulation EMG responses were modulated in a hip-phase-dependent manner. See text for further details.