Figure 3.

An example of the force-length relation (A) observed in the experiments for staircase at 22°C. Individual points represent twitch contractions either prior to (P_t, solid line) or after (P_t*, dashed line) 10 s of 10 Hz stimulation at selected sarcomere lengths. Similar to the situation at 35°C, potentiation was greater at short sarcomere lengths than at long sarcomere lengths. In B, the results from 5 muscles are shown. In this case (as in Figure 2B), the force is expressed as P_t*/P_t. Regression analysis gave r²= 0.48 and P_t*/P_t = -0.39·SL + 2.34 (where SL is sarcomere length).