FIELD: medicine.
SUBSTANCE: invention refers to medicine, particularly to physiology. Cardiorhythmograms and pneumograms are registered simultaneously, analog signals of enveloping curves are quantised with 100 ms discrimination frequency. Correlation ratio (ηxy) is calculated by formula: 
, where Xi are dynamic row values of curve points ranged by respiration for curve enveloping periods of sequential enveloping cardiocycles, Mx is mean arithmetic of dynamic row of curve points ranged by respiration, Mxy is mean arithmetic quotient of dynamic row cardiocycles ranged by respiration curve points. For ηxy over 0.7, stress-free state is diagnosed, for ηxy within 0.3-0.7 medium stress level is diagnosed, for ηxy under 0.3 apparent stress is diagnosed.
EFFECT: improved reliability of stress diagnostics due to calculation of respiratory and cardiac correlation index.
1 tbl
