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Fig. 4. Muscle glycogen phosphorylase a (A) and glycogen synthase I (B) activities prior to and following 5 min of exercise. Glycogen phosphorylase activity is expressed as the percentage of the total activity (measured in the presence of 5'AMP) in the active form (measured in the absence of 5'AMP). Glycogen synthase activity is expressed as the percentage of the total activity (measured in the presence of glucose-6-phosphate) in the active form (measured in the absence of glucose-6-phosphate). R, pre-exercise, post-injection value. Values are means ± 1 S.E.M.. (N=8 for each group). *Significant difference (P<0.05) from the pre-exercise value; {dagger}significant difference (P<0.05) from the corresponding control value.