Stefan Mendt

Bioinformatics, M. Sc.

Center for Space Medicine and Extreme Environments Berlin
Charité Cross Over
Charitéplatz 1 
10117 Berlin

Email Me
+49 (0)30 450 528 519

During the bioinformatic study at the Department of Mathematics and Computer Science at Freie Universität Berlin, Stefan Mendt joined the group Physiology in Space and Extreme Environments as student assistant and completed a research internship on modeling circadian rhythms in humans. In 2012 Mr. Mendt wrote his Master’s thesis at Center for Space Medicine and Extreme Environments Berlin (ZWMB) about the effect of long-term bed-rest on the circadian temperature rhythm.

Since 2012 as doctoral student of Prof. Gunga, Mr. Mendt has been working on his thesis “Circadian core body temperature rhythm before during and after long-term space flights”. As research associate at the Charité – Universitätsmedizin Berlin since 2015, he also holds various courses in human physiology for bioinformatics and medicine students.


Research focus

  • Effects of extreme environmental conditions (in space or on Earth) on human circadian rhythms


Mr. Mendt is currently working on physiological data of

  • astronauts from ESA/DLR project Circadian Rhythms
  • healthy participants underwent 60 days of head-down tilt bedrest
  • cardiac arrest patients after mild therapeutic hypothermia


Additionally,  he supports the group in the processing and analysis of various types of physiological data (temperature, cognition, body composition, ECG, HRV, EEG, etc.) generating from the numerous research projects of the group. His favorite tool is R, a software environment for statistical computing and graphics.


Research Projects


  • ESA/DLR: Evaluation of Circadian Rhythm Alterations by Functional Biomarkers during Winter Over at Concordia (PI: Martina Maggioni)
  • ESA/DLR: Circadian Rhythms: Core Temperature and Circadian Rhythms in Humans During Long-term Spaceflights (PI: Hanns-Christian Gunga)


  • 2014 Second Poster Prize for Monitoring Circadian Rhythm of Core Body Temperature Using the Heat-Flux Approach is Superior to Skin Surface Temperature Recordings at the 52nd Annual Scientific Meeting of Deutsche Gesellschaft für Luft- und Raumfahrtmedizin (DGLRM) e.V.
  • 2011 Nathan Zuntz Scholarship (1 year)



Martina, M.A., Castiglioni, P., Merati, G., Brauns,K., Gunga, H.C., Mendt, S., Opatz, O.S., Rundfeldt, L.C., Steinach, M. Werner, A., Stahn, A.: High-Intensity Exercise Mitigates Cardiovascular Deconditioning During Long-Duration Bed Rest. Front Physiol. 9: 1553, 2018


Stahn A, Werner A, Opatz O, Maggioni MA, Steinach M, Weller von Ahlefeld V, Moore A, Crucian BE, Smith SM, Zwart SR, Schlabs T, Mendt S, Trippel T, Koralewski E, Koch J, Choukèr A, Reitz G, Shang P, Röcker L, Kirsch KA, Gunga HC, Increased core body temperature in astronauts during long-duration space missions, Scientific Reports, 7, Article number: 16180 (2017)


Mendt S., Maggioni MA, Nordine M, Steinach M, Opatz O, Belavý D, Felsenberg D, Koch J, Shang P , Gunga H-C, Stahn A, Circadian rhythms in bed rest: Monitoring core body temperature via heat-flux approach is superior to skin surface temperature, Chronobiology International, Epub 2016 Oct 11;  34(5):666-76, 2017

Steinach M, Kohlberg E, Maggioni MA, Mendt S, Opatz O, Stahn A, Gunga H-C, Sleep Quality Changes during Overwintering at the German Antarctic Stations Neumayer II and III: The Gender Factor, PloS One, 2016


Steinach M, Kohlberg E, Maggioni MA, Mendt S, Opatz O, Stahn A, Tiedemann J, Gunga H-C, Changes of 25-OH-Vitamin D during Overwintering at the German Antarctic Stations Neumayer II and III, PloS One, 2015

Nordine N, Maggioni MA, Stahn A, Mendt S, Brauns K, Gunga H-C, Habazettl H, Nitsche A, Opatz O, Form influences function: Anthropometry and orthostatic stability during sustained acceleration in a short arm Human centrifuge, Acta Astronautica, 115(2015):138-145, 2015