Measuring psychological stress from cardiovascular and activity signals

摘要

A method and system for measuring psychological stress disclosed. In a first aspect, the method comprises determining R-R intervals from an electrocardiogram (ECG) to calculate a standard deviation of the R-R intervals (SDNN) and determining a stress feature (SF) using the SDNN. In response to reaching a threshold, the method includes performing adaptation to update a probability mass function (PMF). The method includes determining a stress level (SL) using the SF and the updated PMF to continuously measure the psychological stress. In a second aspect, the system comprises a wireless sensor device coupled to a user via at least one electrode, wherein the wireless sensor device includes a processor and a memory device coupled to the processor, wherein the memory device stores an application which, when executed by the processor, causes the processor to carry out the steps of the method.

主权项

1. A system for measuring psychological stress, the system comprising:
a wireless sensor device coupled to a user via at least one electrode, wherein the wireless sensor device includes a processor; and a memory device coupled to the processor, wherein the memory device stores an application which, when executed by the processor, causes the processor to: determine R-R intervals from an electrocardiogram (ECG) to calculate a standard deviation of the R-R intervals (SDNN); determine a stress feature (SF) using the SDNN by calculating a mean heart rate (HR) from the ECG within a predetermined time period and by utilizing an algorithm SF =HR+α*SDNN, wherein α is a predetermined negative variable that allows for combining HR and SDNN; in response to reaching a threshold, perform adaptation to update a probability mass function (PMF); and determine a stress level (SL) using the SF and the updated PMF to measure the psychological stress.