1. From the Institute for Aerospace Medicine, German Aerospace Center (DLR), Cologne (J.J., J.T.)
2. Chair for Aerospace Medicine University of Cologne, Germany (J.J.)
3. University Hypertension Center, University of Cologne, Germany (J.J., J.T. H.R.)
4. Department of Internal Medicine and Cardiology, Ev. Klinikum Köln-Weyertal and Department III of Internal Medicine, Heart Center of the University of Cologne, Cologne, Germany (H.R.).