Hans Dreyer, University of Oregon (IMAGE) University of Oregon Caption Hans Dreyer, professor of human physiology at the University of Oregon, is collaborating with orthopedic surgeons on the use of essential amino acids to reduce muscle losses and speed recovery in patients requiring total knee replacement surgery. Credit University of Oregon Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.