Joint NASA-ESA-DARA Study. Part three: circadian rhythms and activity-rest cycle under different CO2 concentrations.

Background: During manned space missions, the actual concentration of carbon dioxide (CO2) is frequently elevated to a degree that may affect human functioning and productivity. Therefore, a ground-based international study was performed that tested various psychological and physiological functions under the condition of two different levels of CO2. Thus, a specific experiment aimed at the influence of enhanced CO2-concentrations on the sleep-wake cycle and the circadian system.

[Stress and fatigue in long distance 2-man cockpit crew].

Common rules on flight-duty times and rest requirements within the European Union are under intense discussion. In the deliberations, results from scientific investigations should be considered. As part of a research programme concerning legal aspects of two-pilot operations on long-haul routes, the purpose of the studies was to investigate two-crew extended range operations during transmeridian and transequatorial flight schedules.