Fig. 3.

Regulation of glycogen accumulation during recovery from exercise. UDPG, UDP-glucose; D, phosphorylated form of glycogen synthase (GS) that is dependent on glucose 6-P (G6P); I, non-phosphorylated GS that is independent of G6P; a, phosphorylated phosphorylase that is independent of AMP; b, non-phosphorylated phosphorylase that is dependent on AMP; PP, protein phosphatases; PK, phosphorylase kinase; GSK, GS kinases; arrow with positive sign ( +) indicates activation of enzyme; arrow with negative sign ( − ) indicates inhibition of D or b form of enzyme. Bold PP, I, and b and red arrows indicate that this is the process that predominates during recovery from exercise. The bold vertical upward arrow indicates that glycogen concentration is increasing under these conditions. See text for further details