Fig. 2. Representative patterns of swimming velocity and acceleration for frog 6. (A) Moderate speed swimming. Velocities (top) and accelerations (bottom) for four consecutive stroke cycles showing increasing velocity and acceleration digitized from the video sequence of a single trial. (B) Vigorous swimming. Velocities (top) and accelerations (bottom) for four stroke cycles from a contrasting trial of the same frog showing a rapid escape stroke followed by three high velocity strokes. Numbers above each acceleration peak represent the plantaris muscle mass-specific power output (W kg^–1) for each cycle.