Mental stress evaluation method based on cardiogenic respiratory signals

Abstract

The invention discloses a mental stress evaluation method based on cardiogenic respiratory signals. The method comprises the following steps that 1, electrocardiosignals are collected, the cardiogenic respiratory signals are extracted by calculating the QRS wave area in an electrocardiogram waveform, and Fourier transform is conducted on the cardiogenic respiratory signals to acquire the respiratory fundamental frequency; 2, electrocardiogram R wave peaks are extracted to acquire RR interphase signals, instantaneous heart rate signals are calculated according to the RR interphase signals, and Fourier transform is conducted on the instantaneous heart rate signals to obtain an instantaneous heart rate power spectrum; 3, nervous system characteristic parameters including low frequency power (LFP), high frequency power (HFP) and LFP / HFP are calculated by combining the respiratory fundamental frequency solved in the step 1 and the heart rate power spectrum solved in the step 2 on the basis of a floating frequency band method, multi-variable linear return analysis is conducted on the nervous system characteristic parameters and a mental stress value, a mental stress evaluation model based on the nervous system characteristic parameters is output, and the mental stress value is calculated. The method has the advantages of the feasibility, the clinical practicability and the like.

Description

technical field [0001] The invention relates to a mental stress assessment technique, in particular to a mental stress assessment method based on cardiogenic breathing signals. Background technique [0002] Mental stress has been defined by the World Health Organization as "the scourge of the Western world" and according to the International Labor Office, it has become "one of the most serious problems of our time, endangering not only the physical and mental health of individuals but also businesses and governments ". The development of modern society is accompanied by invisible pressure that affects people's lives. Under the combined effects of work pressure, family pressure, and study pressure, it is difficult for people to vent their emotions. Accumulated stress may cause other diseases in the body and affect the balance of body functions. [0003] Today's assessment methods for mental stress mainly use psychological tests to obtain stress indicators. This assessment ...

AI Technical Summary

Problems solved by technology

However, the heart rate variability signal is an unstable signal, which is affected by the respiratory rate, especially the average heart rate, high-frequency components and other parameters are greatly affected by the respiratory rate. It is necessary for the subject to maintain a stable and consistent respiratory rate for evaluating the state of the nervous system. , otherwise there is a large error in the test result

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