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Fig. 3. Change in length of a depressor mandibulae muscle vs time during a
load-clamp experiment. When the load is reduced (t=0), the muscle
exhibits a fast phase of shortening and a slow phase of shortening with
oscillations during the transition. To define the fast to slow phase
transition (red circle), a line representing shortening during the slow phase,
and bisecting the oscillations, was extrapolated back to its initial
intersection with the length trace. Fast phase displacement is defined as the
change in length that occurs from the initial position (t=0) to this
point of intersection. This trace corresponds to Ba 1 (
F=2.82)
in Fig. 8B.