Carl Ade, Kansas State University (IMAGE) Kansas State University Caption Carl Ade, Kansas State University assistant professor of exercise physiology, and collaborators have found that astronauts' exercise capacity decreases in long-duration spaceflight because the heart and small blood vessels are not as effective at transporting oxygen. Credit Kansas State University 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.