Figure 6. Rate of diazo-2-induced relaxation in skinned psoas fibres containing endogenous TnC at 15 °C as a function of pre-photolysis force (F_pre/F_4.0), diazo-2 chelating capacity ([diazo-2]_free/[Ca²⁺]_free) and post-photolysis force (F_post/F_4.0).

A, the relaxation rate was not significantly correlated with F_pre/F_4.0. B, the relaxation rate was significantly correlated with the diazo-2 chelating capacity. Data were equally well fitted with a linear relationship, relaxation rate = 0.0103 ± 0.0004 × (chelating capacity) or with an exponential relationship, relaxation rate = 45 s⁻¹× (1 - e^{−k× chelating capacity}), where k = 5.4 × 10⁻⁴± 5 × 10⁻⁵. C, relaxation rate was not significantly correlated with F_post/F_4.0. Results in each panel are from the same fibres (n = 41).