mKO mice display normal activation of exercise-responsive proteins following AEX. Protein phosphorylation and total abundance were determined in gastrocnemius whole muscle lysates of sedentary (SED) mice or immediately after AEX (0 h post). A–C, phosphorylation of AMPKThr172 and its substrates (A), ACCβSer79 (B), and HDAC5Ser498 (C) were increased equally 0 h after AEX versus SED, in WT and mKO. D and E, phosphorylation of ATF2Thr71 and CREBSer133 (D) and CaMKIIThr286 and p38 MAPKTHR180/TYR182 (E) were increased equally 0 h after AEX versus SED in WT and mKO. Data represent n = 4–6/group. All data are presented as mean ± S.E. (error bars). *, within genotype p < 0.05.