Key result
Mental stress was most sensitively detected by PPG morphology parameters including forward wave amplitude A1, diastole duration Td, reflected wave delay T13, and pulse interval Tp.
Why the study?
Persistent stress impacts health and quality of life, and this study evaluates photoplethysmogram signal morphology parameters for mental stress assessment.
Do photoplethysmogram (PPG) signal morphology parameters change in response to mental stress in healthy subjects?
Observational (n=18)
Do photoplethysmogram (PPG) signal morphology parameters change in response to mental stress in healthy subjects?
Specific morphological parameters derived from photoplethysmogram signals, such as forward wave amplitude and diastole duration, are sensitive indicators of mental stress.
Answers are grounded in this paper and cite their sources.
PPG morphology parameters may enable non-invasive stress monitoring; leaves open validation before clinical adoption.
Stress is a healthy natural response to a perceived or actual threat. However, when stress is persistent, it may decrease work productivity, increase the risk of diseases, and affect the quality of life. Stress is reflected in physiological variables, such as heart rate, blood pressure, and pulse wave velocity among others. A photoplethys-mogram (PPG) contains information related to pulse rate and blood pressure. This study analyses parameters derived from PPG signal morphology for mental stress assessment.A low-complexity algorithm is designed using bandpass filtered higher-order derivatives of the PPG signal for estimation of six morphological parameters: the forward pulse wave amplitude A1, the systole and diastole durations T1 and Td, the time delays of reflected waves T12 and T13 from the renal and iliac sites in the central arteries, and the pulse duration Tp. The parameters were investigated on a set of 18 healthy subjects by using a modified Trier Social Stress Test.The results show that the most sensitive PPG morphology parameters to mental stress are the amplitude of forward wave A1, the duration of diastole Td, the time delay of the reflected wave T13, and the pulse-to-pulse interval Tp.
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Rinkevičius et al. (2019) conducted an observational in Mental stress (n=18). Modified Trier Social Stress Test was evaluated on Sensitivity of PPG morphology parameters to mental stress. Mental stress was most sensitively detected by PPG morphology parameters including forward wave amplitude A1, diastole duration Td, reflected wave delay T13, and pulse interval Tp.
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