Functional state periodic oscillations and long space flight adaptation problem
- Paper number
IAC-06-A1.P.1.04
- Author
Dr. Roman Baevsky, Institute for Biomedical Problems, Russia
- Coauthor
Mrs. Irina Larina, Institute for Biomedical Problems, Russia
- Year
2006
- Abstract
Introduction. There is known, that processes of a metabolism and energy, and also structures renewal are organized in time and characterized by periodic fluctuations of various parameters. Are biological organism’s functional state fluctuations connected with adaptability during long space flight? This question has the direct attitude to decision of practical problems of the cosmonauts health monitoring. Methods. Periodic oscillatory processes of middle (from 0, 5 hour till 6 days) and low (weeks, months) frequencies, which are connected with metabolic processes in a biological organism, are considered (F.Halberg, 1960, 2002). Results of researches in model experiment with 240-daily isolation (4 volunteers) and the data obtained in long space flights on the orbital station “Mir” and the ISS (n=10) are presented. Body temperature in several points, a complex of psychophysiological tests, concentration of free cortisol in a saliva, heart rate variability (HRV) were recorded in isolated chamber. The 24-hours oscillation of parameters was investigated. Differences between evening and morning parameters are reviewed as indicator of energetic and metabolic reserve restoration. The HRV analysis was applied to analyze short records and night balistocardiogram signals recorded with special sensor, which was fixed on astronaut’s sleeping bag (R.M. Baevsky et al., 1997). Results. Multivariate mathematical analysis revealed, with high reliability of 60-days oscillation of parameters in 240-daily isolation in chamber (A.F.Bystritskaja et al., 2000). According to the analysis of evening-morning differences of HRV parameters the period of these fluctuations was unique for each person and changed within the limit from 2 till 4 months (R.M.Baevsky et al., 2000). Within 8 months are marked from 2 till 4 periods. During long space flights 2-4th oscillations of autonomous balance parameters, vascular tone, energo-methabolical control center activity were revealed. Analyzing night records the heart rate oscillations from 0,5 to 3 hours, which are characterized activity of high autonomous centers were recognized. As a rule, maximum of these oscillations are marked on 2-4 month of space flight. Conclusion. 2-4-month oscillations of physiological, biochemical and psychological parameters reflect patterns of adaptive activity of a biological organism. Their further studying is necessary for a deepening of our knowledge of fundamental properties of a living matter. Practical value of the research is criteria based on the results can be developed for adaptability estimation.
- Abstract document
- Manuscript document
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