Fig. 5.

Example of modulated and unmodulated EMG responses in the left biceps femoris (top panel) during no touch and heavy touch (grey area) when axially rotating the legs, ±10º, 1º/s (bottom panel). As indicated by the vertical line, muscle activation occurred during the shortening phase as the platform turned to the left (positive) and the left foot rotated externally and the right internally. These phasic muscle bursts (shortening responses) stopped as soon as the subject touched the bar (second panel from above) and started again when heavy touch contact with the bar was terminated