In vivo muscle force and muscle power during near-maximal frog jumps - Fig 3

Representative curves of (A) muscle force, (B) length changes, (C) shortening velocity, and (D) shortening power of a plantaris longus (PL) muscle (black solid curves) and/or fascicle (red dashed curves) during a 65cm jump as shown in Fig 2. The duration of muscle activation is indicated by the yellow-highlighted region on the time axes. Time zero is defined as the beginning of the propulsive phase (see ‘Methods’ section for details). The inset in (B) shows the sarcomere force-length curve of a frog [41], with the sarcomere range observed in the current study highlighted by a bold red line (from 1.91±0.08 μm to 2.07±0.09 μm; Nfiber = 6). Peak shortening power occurred when peak muscle force and peak shortening velocity were achieved.