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Fig. 4. (A) Data recordings of plantaris longus force (red), whole-muscle length
(blue), and activation (black) from frog 4 to show the maximum differences
observed between individual animals (compare with
Fig. 3A). (B) Diagram showing
the variation in the relative timing of force–length activation events
among swimming strokes for frog 5. Note that force develops passively at the
end of the previous cycle, as the limb is being protracted and the ankle and
knee are flexed.