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. 1999 May 1;516(Pt 3):847–853. doi: 10.1111/j.1469-7793.1999.0847u.x

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© The Physiological Society 1999

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Values of maximal shortening velocities obtained by slack-test experiments in frog tibialis anterior (A) and rabbit psoas myofibrils (B) at different MgATP concentrations. Data points obtained from 7-10 myofibrils (mean ±s.e.m.) were fitted to hyperbolas (continuous lines) of the form:
where V_a is the asymptotic value for V₀ and K_m is the substrate concentration for which the absolute value of V₀ is half V_a. The best fits were obtained with V_a = 3.6 ± 0.2 l₀ s⁻¹ and K_m = 0.21 ± 0.02 mM in frog tibialis anterior myofibrils and with V_a = 0.8 ± 0.03 l₀ s⁻¹ and K_m = 0.12 ± 0.01 mM in rabbit psoas myofibrils.

graphic file with name tjp0516-0847-mu1.jpg — Values of maximal shortening velocities obtained by slack-test experiments in frog tibialis anterior (A) and rabbit psoas myofibrils (B) at different MgATP concentrations. Data points obtained from 7-10 myofibrils (mean ±s.e.m.) were fitted to hyperbolas (continuous lines) of the form:
where V_a is the asymptotic value for V₀ and K_m is the substrate concentration for which the absolute value of V₀ is half V_a. The best fits were obtained with V_a = 3.6 ± 0.2 l₀ s⁻¹ and K_m = 0.21 ± 0.02 mM in frog tibialis anterior myofibrils and with V_a = 0.8 ± 0.03 l₀ s⁻¹ and K_m = 0.12 ± 0.01 mM in rabbit psoas myofibrils.