Activation of fiber contraction by flash photolysis of NPE-ATP.

<p>(A) Typical force transients from a representative perfused and ischemic fiber activated from Ca²⁺-rigor by photoliberation of ATP from NPE-ATP. Single exponential fits to the data traces are shown as dotted lines along with the rate constant of force activation. (B) The rate constant of force activation for perfused (n = 13) and ischemic (n = 12) fibers activated by flash photolysis of NPE-ATP. Data presented are average ± S.E.M.