Wireless Sensor Stress Measurement Using Normalized Heart Rate
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Solution Overview
Problem
Conventional methods for measuring psychological acute stress, such as heart rate and heart rate variability, are highly variable between individuals, making continuous and accurate monitoring challenging, necessitating a cost-effective solution for adaptive individualized physiology measurement.
Innovation Solution
A wireless sensor device with a processor and memory that detects physiological signals, calculates normalized heart rate and heart rate variability features, and determines a stress level using a stress feature to quantify psychological acute stress, employing a stress index metric for continuous monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional heart rate and heart rate variability methods are used to measure psychological stress, then stress measurement is achieved, but high individual variability limits measurement accuracy and reliability
Solution Approach 1:
The patent transforms raw physiological parameters (heart rate, heart rate variability) into a normalized stress index through mathematical transformations including deviation from baseline, scaling factors, and aggregation of multiple features. This parameter transformation approach converts highly variable individual physiological responses into a standardized metric that enables reliable cross-individual comparison while maintaining measurement precision for each individual's stress state
2Reliability
If individualized physiological measurement is implemented to overcome variability, then measurement reliability improves, but system complexity and cost increase
Solution Approach 1:
The system performs self-calibration by automatically establishing each user's baseline physiological parameters during initial use and continuously updating baselines over time. The device autonomously adapts to individual variations without requiring manual configuration or complex customization, thereby achieving reliable individualized measurement while keeping the system simple and cost-effective
Solution Approach 2:
The patent employs a universal stress index framework that can process multiple different physiological inputs (heart rate, heart rate variability, and potentially other biometric data) through a common normalization and aggregation algorithm. This multi-functional approach allows the same system architecture to handle various individual physiological characteristics reliably without requiring separate customized systems for each user
Data Source
AI summary
A method and system for determining psychological acute stress are disclosed. In a first aspect, the method comprises detecting a physiological signal using a wireless sensor device, determining a stress feature using a normalized heart rate and a plurality of heart rate variability (HRV) features, wherein the normalized heart rate and the plurality of heart rate variability features are calculated using the detected physiological signal, and determining a stress level using the stress feature to determine the psychological acute stress. In a second aspect, the system comprises a wireless sensor device that 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 wireless sensor device to carry out the steps of the method.