Research And System Development Of Short-term Stress Evaluation Methods Based On Cardiac Output

Stress is a systemic non-specific adaptive response that occurs when the body is stimulated by various internal and external environmental factors and social and psychological factors.Long-term high-intensity stress can lead to a significant increase in the risk of cardiovascular disease and depression.The study found that there is a “blunt” physiological response in the cardiovascular system of patients with depression under stress.Exploring the relationship between this phenomenon and the degree of depression has good application value and practical significance for the early detection of depression.In this study,short-term stress assessment was conducted with the goal of cardiovascular system function response and its changes.Taking advantage of the significant characteristic that cardiac output can directly reflect cardiovascular functions and circulatory mechanism of the human body,adopting the principle of chest electrical impedance,the stress detection system based on cardiac output is designed and developed which realized the non-invasive,continuous,high-precision testing for stroke output,heart rate and cardiac output.Taking cardiac output as the main evaluation index,the experimental design of cardiovascular function response under short-term stress was carried out.The second edition of the Beck Depression Self-Assessment Scale was used to screen the subjects,and the normal group and the depression group were divided based on the self-assessment score.Through the short-term stress experiment based on cardiac output,the differences in cardiac output patterns between normal population and depression-oriented population were obtained.The main reasons for the difference and its influencing factors were discussed.The magnitude of the change and the range of error for these differences was quantitatively analyzed.And finally the quantitative basis for the determination of the degree of depression based on the magnitude of cardiac output changes was concluded.This study further validated the “blunt” physiological response of the cardiovascular system in depression-prone groups by means of cardiac output testing under short-term stress,and demonstrated that the degree of depression judged by monitoring cardiac output under short-term stress stimulation is feasible.