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Fig. 7. (A) Muscle force and fascicle length for the lateral gastrocnemius (LG) and peroneus longus (PL) muscles during one full stride from a turkey running at a steady speed of 2 m s–1 on a declined (–12°), level and inclined (+12°) treadmill. Shaded areas are stance; unshaded areas are swing. Dashed vertical lines indicate the time to peak muscle force in stance. During decline running, the PL shifted the time to peak force production from late stance into early stance to correlate with muscle lengthening. The LG did not shift the time to peak force production in response to decline running. (B) A summary graph of mean ± S.E.M. values for all birds showing the time to peak force for LG (filled triangles) and PL (open circles) muscles in relation to running slope. L, fascicle length.