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Fig. 2. Muscle force, fascicle length and power output for the lateral
gastrocnemius, LG, and peroneus longus, PL, muscles in a turkey running at a
steady speed of 2 m s1 on level ground. Shaded areas are
stance, when the foot is in contact with the ground; unshaded areas are swing,
when the foot is off the ground and being repositioned for the next step.
L, fascicle length; L0, resting segment
length.