FIELD: medicine, functional diagnostics. SUBSTANCE: ECG is registered in the second standard deviation. A rhythmocardiogram of R-R intervals is registered, too. The power of parasympathetic waves developed by 150-170 cardiointervals is evaluated. Power evaluation is carried out in the state of rest, during and after sampling at forced breathing. At higher power during loading being 1.5-2.5 times higher against an initial value and its return after the loading into initial state one should detect the normal state in regulation of parasympathetic department of an autonomic nervous system. The method is noninvasive, simple and of high information value. EFFECT: higher efficiency. 4 tbl
