Аннотация
Participants of the Mars-500 experiment living in Syktyvkar (northerners) and Almaty (southerners) were studied during a year in contrasting seasons. Latitude-related differences in autonomic index and, in the warm season, in the RMSSD and pNN50 indices. The northerners were observed to have significant seasonal shifts in thermoregulation parameters and the RMSSD and pNN50 values related to the climatic contrast. The southerners exhibited no seasonal changes in these indices. The participants from both groups were shown to have deviations in several physiological parameters from the normal values for temperate latitudes. Many participants from both groups were in the state of stress. Orthostatic tests revealed deficiencies in regulation of blood circulation.