Increased insulin-stimulated Akt pSer473and cytosolic SHP2 protein abundance in human skeletal muscle following acute exercise and short-term training

Abstract

The purpose of the present study was to determine in human skeletal muscle whether a single exercise bout and 7 days of consecutive endurance (cycling) training 1) increased insulin-stimulated Akt pSer473and 2) altered the abundance of the protein tyrosine phosphatases (PTPases), PTP1B and SHP2. In healthy, untrained men ( n = 8; 24 ± 1 yr), glucose infusion rate during a hyperinsulinemic euglycemic clamp, when compared with untrained values, was not improved 24 h following a single 60-min bout of endurance cycling but was significantly increased (∼30%; P < 0.05) 24 h following completion of 7 days of exercise training. Insulin-stimulated Akt pSer473was ∼50% higher ( P < 0.05) 24 h following..