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Ea vs. time for the data of figure 2. Points (1–5) are the computed values of Ea during isovolumic contraction phase, based on equations 11(a-e). In the isovolumic relaxation phase, the computed values are represented by the symbol Δ, for Ea,17 = 1.1 mmHg/ml. The best fit for Ea during isovolumic contraction and relaxation phase is given by the curve: Ea = -12000t6 + 17000t5 - 7700t4 + 1100t3 + 19t2 + 0.59t + 0.00056
