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Fig. 4. EMG activity as a function of speed in the triceps (filled squares) vastus
(filled triangles). (A) Activation phase advance did not change with speed in
the triceps but it did in the vastus. (B) EMG burst duration, as a percentage
of stance duration, did not change with speed in either muscle, averaging
40% in the triceps and 60% in the vastus. (C) Integrated EMG
increased with speed in both muscles, indicating an increase in the volume of
active muscle. Integrated EMG was normalized to the highest value measured in
the same animal trotting up an incline
(Wickler et al., 2005).
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