T Yanev

Bulgarian Academy of Sciences, Ulpia Serdica, Sofia-Capital, Bulgaria

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Publications (6)1.24 Total impact

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    ABSTRACT: Sleep problems have been observed during many of the space flights. The existence of poor quality of sleep, fatigue, insomnia or different alterations in sleep structure, organization and sleep cyclicity have been established. Nevertheless results obtained from investigations of human sleep on board manned space vehicles show that it is possible to keep sleep patterns related to the restorative and adaptive processes. For the first time in the frame of the "Intercosmos" program a multi-channel system for recording and analysis of sleep in space was constructed by scientists of the Bulgarian Academy of Sciences and was installed on board the manned Mir orbiting station. In 1988 during the joint Bulgarian-Russian space flight continues recording of electro-physiological parameters necessary to estimate the sleep stages and sleep organization was made. These investigations were continued in next space flights of different prolongation. The results were compared with the findings obtained under the conditions during the pre- and post-flight periods.
    Advances in Space Research 02/2003; 31(6):1611-5. · 1.24 Impact Factor
  • Source
    Comptes Rendus de l'Academie Bulgare des Sciences. 01/2002; 55(11):27.
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    ABSTRACT: The influence of solar activity changes and related to them geomagnetic field variations on human health is confirmed in a lot of publications but the investigations in this area are still sporadic and incomplete because of the fact that it is difficult to separate the geomagnetic influence from the environmental factor complex, which influence the human life activity. That is why we have studied the influence of changes in geomagnetic activity on human physiological, psycho-physiological parameters and behavioural reactions. In this article we looked for influence of changes in GMA on the systolic and diastolic blood pressure and pulse-rate. We examined 54 volunteers. 26 persons of them had some cardio-vascular or blood pressure disturbances. The registrations were performed every day at one and the same time for each person during the period 1.10 - 10.11.2001. Four-way analysis of variance (MANOVA method) with factors: GMA, day, sex and cardiovascular pathology was performed. GMA was divided into four levels according to the Kp- and Ap-index values. The days examined were divided into six levels in relation to the day with increased GMA. Factor "cardiovascular pathology" was divided into two levels: healthy subjects and subjects that had some cardio -vascular or blood pressure disturbances. When we employed four-way analysis of variance, the influence of some of the factors on the physiological parameters examined turned out to be statistically significant at p<0.05. Our investigations indicate that most of the persons examined irrespectively to their status could be sensitive to the geomagnetic disturbances.
    01/2002;
  • Source
    I Stoilova, T Zdravev, T Yanev
    Comptes rendus de l'Académie Bulgare des sciences : sciences mathématiques et naturelles. 02/2000; 53(6):59-62.
  • Aviakosmicheskaia i ekologicheskaia meditsina = Aerospace and environmental medicine 02/2000; 34(1):65-7.
  • I Stoilova, T Yanev
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    ABSTRACT: The heart rate (h.r.) of normal healthy subjects varies in rest, under high-load conditions and in pathology. The heart rate variability (h.r.v.) integrates many mechanisms in- and outside the central nervous system, which influence and regulate the h.r. Statistical methods have been used to obtain additional information concerning the diagnostic capabilities h.r.v., the correlation between ECG R-R intervals and their variability and the prognostic significance of h.r.v. The benefits of modification of h.r.v. are not well known. In our previous study the h.r.v. of astronauts before, during and after long-term space flight (seven months) was examined. In this study we make analysis of h.r.v. in wake and sleep in different phases during a short-time space flight (9 days) of the Bulgarian astronaut A.A. in 1988.
    Comptes rendus de l'Académie Bulgare des sciences : sciences mathématiques et naturelles. 02/1997; 50(7-8):17-20.