Figure 7. Effects of early fatigue on the tetanus rise and fitting with a single exponential equation.

A, effects of early fatigue on the tetanus rise. Control, thin line; 10th tetanus, thick line. Both records are normalized for their respective P ₀. B, fit (continuous line) of the control tetanus rise (empty circles). The fitting equation is $P=A_{\mathrm{s}}(1-e^{-k_{\mathrm{s}}t})$, where A _s is amplitude of exponential force component of the tetanus rise and k _s is rate constant of the exponential force component of the tetanus rise. Experimental force data were sampled at 1 ms/point but the number of points plotted on the figure were reduced for clarity.