text: The results showed that IR tyrosine phosphorylation (pIR) was reduced by 42 % in MSG-obese mice (MSG, 6.7 ± 0.2 arbitrary units (a.u.); control, 11.5 ± 0.4 a.u.); on the other hand, exercise training increased << pIR >> by 76 % in [[ MSG ]] mice without affecting control mice (MSG, 11.8 ± 0.3; control, 12.8 ± 0.2 a.u.).