Fig. 6.
A: time-dependent change in PCr/(PCr + Pi) during the exercise-recovery-ischemia-reperfusion protocol. PCr/(PCr + Pi) declines during exercise but returns to its resting level during recovery. During ischemia and reperfusion, PCr/(PCr + Pi) level does not change significantly. B: time-dependent change in Pi/(PCr + Pi) during the course of exercise-recovery-ischemia-reperfusion protocol. Pi/(PCr + Pi) level increases with %MVC and returns to resting level during recovery. No change occurs during ischemia and reperfusion. C: pH decreases during exercise and returns slowly to its initial level during recovery. Ischemia and reperfusion do not perturb the pH. PCr, phosphocreatine; Pi, inorganic phosphate.