Fig. 5.

Starting (open symbols) and ending (closed symbols) sarcomere lengths during active lengthening as a function of speed in the proximal (green), central (red) and distal (blue) portions of the posterior ILPO. Thick solid bars connect the start (minimum) and end (maximum) lengths for each segment. Error bars indicate –1 s.e.m. for the start length and +1 s.e.m. for the end length. Shaded areas indicate the calculated plateau and ascending limb of guinea fowl ILPO length–tension curve, based on filament lengths.