Figure 2. Changes in white msucle glycogen phosphorylase (A) and glycogen synthase (B) prior to and following exercise to exhaustion (indicated by hatched bar). Control fish (filled squares) were injected with saline 1 hour prior to exercise. Metyrapone fish were injected with 3 mg/100 g metyrapone 1 hour prior to exercise. * indicates a significant difference from value in resting fish (i.e. prior to exercise).