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. 2019 Jun 19;10:769. doi: 10.3389/fphys.2019.00769

FIGURE 2.

FIGURE 2

Hyperbolic force-velocity relationship. Data were obtained from Figure 12 in Hill (1938) using specialized software (ImageJ 1.51q8, NIH, United States). This modified version represents the force-velocity relationship of the isolated sartorius muscle of a frog. A hyperbolic function was fitted to the data (least squares method): (F + 14.4) × (V + 1.0) = (70.6 + 14.4) × 1.0; R2 = 0.998.