Figure 2.

Typical EMG and kinematic data associated with the experimental paradigm. (A) From the top, angular elbow displacement and velocity associated with one typical elbow flexion in the horizontal plane are respectively depicted, along with the EMG activities of Bic and Tric muscles. In the two panels at the bottom, the smoothest lines represent the envelopes of the rectified EMGs and were obtained by low-pass filtering the rectified EMG at 5 Hz, the spikiest ones at 20 Hz. Clearly, different filtering frequencies do not modify the main temporal features of the signals. (B) EMG traces of individual rapid flexion and extension movements of the elbow in a normal subject. In all conditions the triphasic pattern results clearly present.