title: [Quantitative assessment of current functional state under stressful conditions].
abstract: Spectral analysis of heart rate variability was used for quantitative assessment of human functional state (FS) under stressful conditions. The results of the investigation of three groups consisting of apparently healthy individuals such as candidates for becoming cosmonauts (1), sportsmen-parachutists (2) and sportsmen of cyclic kinds of sports (3) demonstrate that there are common patterns of response to stress. In all the groups the decrease of general spectral power at the expense of sympathetic (LF) and, to greater extent, parasympathetic (HF) components was detected. In the 1st and the 2nd groups it was associated with significant increase of the ratio LF/HF and the reduction of parasympathetic reactivity (the coefficient made up 30/ 15). However, in contrast to the 1st and the 2nd groups, such changes were lacking in the 3rd group. It has been concluded that the results of this investigation may be taken into account in the course of the assessment of human FS under stressful conditions. The ways of their interpretation depending on spectral characteristics are given.
authors.forename: V M
authors.initials: VM
authors.lastname: Mikhaĭlov
authors.forename: A L
authors.initials: AL
authors.lastname: Pokhachevskiĭ
authors.forename: E V
authors.initials: EV
authors.lastname: Pokhachevskaia
mesh_terms: D000222:Adaptation, Physiological; D000328:Adult; D018480:Astronauts; D015444:Exercise; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D010809:Physical Fitness / Q000502:physiology*; D013177:Sports / Q000502:physiology; D013312:Stress, Physiological / Q000503:physiopathology*