Fig. 14. Dependence of the parameters of the Hill curve on stimulation frequency. (A) Dependence of the isometric force P₀ on stimulation frequency (N=11). (B) Dependence of maximum contraction velocity V₀ on stimulation frequency (N=5). In both A and B the data from each experiment were fitted by an exponential saturation function leading to the same mean `frequency-constant' of about 60 Hz for both dependencies. The dotted lines show the shallowest and steepest fits and the bold lines show mean ± s.d. Please note that the number for individual means can differ (in A, 6N9; in B, 4N5). (C) Coupling of maximum contraction velocity V₀ with isometric force P₀ under variation of stimulation frequencies (N=5). The values of each set of experiments are marked by connecting straight lines. For all individual experiments the data showed a significant correlation (P<0.03). Note that the maximum values V₀ and P₀ at 200 Hz for each experiment roughly determine the overall slopes of the diagrams. See text for details.