Email: hoffmann@dshs-koeln.de

Qualifications

1982-1984 Doctoral Degree, Sports sciences German Sport University, Germany

Publications (Selected)

1. Hoffmann, U., Schöllmann, C., Wackerhage, H., Leyk, D., Wenzel, J. "Effects of chronically increased ambient CO2 concentrations on aerobic capacity" Aviat Space Environ Med, Vol. 69, p. 397-402, 1998.
2. Elliott, A., Prisk, G., Schöllmann, C., Hoffmann, U. "Hypercapnic Ventilatory Response in Humans Before, During, and After 23 Days of Low Level CO2 Exposure" Aviat Space Environ Med, Vol. 69, p: 391-396, 1998.
3. Leyk, D., Hoffmann, U., Baum, K., Wackerhage, H., Essfeld, D. "Leg blood flow during slow head-down tilt with and without leg venous congestion" Eur J Appl Physiol, Vol. 78, No. 6, p:538-543, 1998.
4. Kusenbach, G., Wieching, R., Barker, M., Hoffmann, U., Essfeld, D. "Effects of hyperoxia on oxygen uptake kinetics in cystic fibrosis patients as determined by pseudo-random binary sequence exercise" Eur J Appl Physiol, Vol. 79, p: 192-196, 1999.
5. Wackerhage, H., Hoffmann, U., Essfeld, D., Leyk, D., Mueller, K., Zange, J. "Recovery of free ADP, Pi and free energy of ATP hydrolysis in human skeletal muscle" J Appl Physiol, Vol. 85, No. 6, p: 2140-2145, 1998.
6. Hoffmann, U., Smerecnik, M., Buttgereit, P., Leyk, D. "Combined influences of breath-hold, Valsalva maneuver, and intensitive exercise on heart rate and blood pressure" 2001.
7. Essfeld, D., Hoffmann, U., Leyk, D., Baum, K. "Effects of reduced physical activity" In: ECSS, Vol. 6, p: 1034, 2001.
8. Hoffmann, U., Leyk, D., Essfeld, D. "Determination of VO2 kinetics and the influence of venous return" In: ECSS, Vol. 6, p: 111, 2001.
9. Keskinen, K.L., Rodriguez, F.A., Kusch, M., Hoffmann, U. "Validity of breath-by-breath spirometric measurements with two swimming snorkels assessed by a gas exchange simultation system" In: Proceedings of the IX world symposium biomechanic and Med. In swimming. Saint-Etienne, 2002.
10. Hoffmann, U., Kusch, M., Keskinen, K.L., Rodriguez, F.A. "Validity of breath-by-breath metabolic cart assesed by a gas exchange simulation system. In: ECSS, Vol. 7, 2002.
11. Kusch, M., Keskinen, K.L., Rodriguez, F.A., Hoffmann, U. "Validierung und Kalibrierung von Spirometern durch einen Gasaustauschsimualtor mittels verschiedener Prüfprotokolle" In: Tagungsband zu 2. Workshop Sporttechnologie zwischen Theorie und Praxis, Chemnitz, 2002.
12. Kusch, M., Vogt, A., Hoffmann, U. "Quality control of various Ergospirometric measuring Parameters by means of a gas exchange simulation system" Jounal f. Kardiologie, Vol. 10, No. 9, p: 405, 2003.
13. Smerecnik, M., Hoffmann, U., Leyk, D. "Cardiovascular responses to apnea and exercise" In: Clinical Autonomic Research, Vol. 13, No. 1, p: 61, 2003.
14. Smerecnik, M., Hoffmann, U., Leyk, D. "Heart rate and blood pressure responses to apnea and exercise. In: ECSS,Vol. 8, p: 139, 2003.
15. Kusch, M., Vogt, A., Hoffmann, U. "Quality control of various ergospirometric measuring parameters by means of a gas exchange simulating system. In: ECSS, Vol. 8, p: 407, 2003.
16. Hoffmann U., Dräger T., Steegmanns A., Koesterer T., Linnarson D. Influence of combined exercise and gravity transients and apnea on hemodynamics. Eur J Appl Physiol; Vol. 106: p. 589-597, 2009