Using cardiovascular parameters for determination of person’s gender identity

BACKGROUND: Emotional stress is a significant risk factor for the development of cardiovascular diseases. Prenosological diagnostics of these conditions becomes important. The peculiarities of adaptive reactions are largely determined by individual psychological characteristics of an individual, including gender identity. 
AIM: Determination of correlation of functional parameters of the cardiovascular system for objectification of psychological criteria for classification of gender identity. 
MATERIALS AND METHODS: Hemodynamics and heart rate variability were studied in people with different gender identities. A total of 200 volunteers of both sexes were examined in a state of mental and physical rest. 14 parameters of cardiovascular activity were selected to construct discriminant functions: stroke volume of blood flow, cardiac output, cardiac index, stroke index, heart rate, standard deviation of RR intervals, square root of the mean squared difference of successive RR, percentage of RR intervals with a sinus rhythm of the heart, which differ by more than 50 ms, index of vegetative equilibrium, vegetative rhythm index, indicator of the adequacy of regulatory processes, stress index of regulatory systems, indicator of the activity of regulatory systems. The obtained indicators and initial coefficients reflecting the contribution of each parameter to the discrimination of groups were used to calculate discriminant functions. 
RESULTS: It was found that the graphs reflecting the results of discriminant analysis showed a high degree of accuracy in classifying men (97.6%) and women (96.5%) by gender identity based on objective characteristics of cardiovascular activity. The objectivity of psychological testing with a high probability of predicting the type of gender identity based on the analysis of rheography and rhythmocardiography data is shown. 
CONCLUSIONS: The use of objective characteristics of cardiovascular activity obtained during rheography and rhythmocardiography made it possible to predict the type of a persons gender identity with high probability.