Bioimpedance Spectroscopy for Body Composition via Cole Model Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current bioimpedance spectroscopy technologies face issues with accuracy and reliability due to errors in measuring extracellular and intracellular water masses, stray capacitance, and systemic variations, which affect the measurement of body composition and hydration status, as well as the dynamic modeling of human energy metabolism.
Innovation Solution
The method involves high-frequency impedance spectroscopy with a sensor to acquire electrical measurements, combining a ratio technique with a canonical model form, and performing mathematical calculations to determine indirect dynamic human metabolism parameters, including individualized self-correction and self-adaptive modeling, real-time calculations, and the use of difference equations to estimate macronutrient oxidation rates and energy balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If bioimpedance spectroscopy is used to measure extracellular and intracellular water masses, then body composition and hydration status can be determined, but measurement accuracy deteriorates due to errors in resistance and reactance measurements
Solution Approach 1:
The patent implements feedback by using measured resistance and reactance values to continuously update and refine the Cole model parameters (R0, R∞, C). The system compares measured impedance values against model predictions and adjusts parameters to minimize error, thereby improving measurement accuracy and reliability of body composition determinations
Solution Approach 2:
The patent transforms raw resistance and reactance measurements into meaningful physiological parameters through mathematical modeling. By changing parameters from direct electrical measurements to derived biological metrics (extracellular water mass, intracellular water mass, lean body mass, fat mass) using the Cole model, the system achieves both improved measurement precision and reliability
2Measurement precision
If high frequency impedance spectroscopy is used to measure dielectric properties, then body composition measurement accuracy improves, but device complexity increases due to multiple frequencies and mathematical modeling requirements
Solution Approach 1:
The patent makes the measurement system universal by implementing a multi-frequency impedance spectroscopy platform that can determine multiple body composition parameters (total body water, extracellular water, intracellular water, lean body mass, fat mass) from a single set of electrical measurements. The Cole model serves as a universal framework that works across different frequency ranges and subject types
Solution Approach 2:
The patent replaces complex mechanical or chemical body composition analysis methods with electrical impedance measurements combined with mathematical modeling. By substituting electrical fields for mechanical or chemical measurement systems, the patent achieves high measurement precision while reducing overall system complexity
3Ease of operation
If Moissl's equations with body mass index correction are used to calculate water mass, then hydration status can be determined, but measurement accuracy deteriorates due to errors in reference values
Solution Approach 1:
The patent performs preliminary action by measuring impedance across multiple frequencies and fitting the Cole model to obtain accurate R0, R∞, and C parameters before calculating water mass. This preliminary modeling step establishes accurate baseline values that eliminate the reference errors present in Moissl's equations, enabling both ease of operation and high precision in hydration status determination
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the accuracy and reliability of body composition and hydration status measurements, provides individualized and real-time monitoring of human energy metabolism, and allows for precise estimation of macronutrient intake and energy balance, overcoming the limitations of existing methods.
Implementation Method 1
high frequency impedance spectroscopy with a sensor to acquire electrical measurements
Implementation Method 2
detection of daily changes of dielectric properties of the human body
Data Source
AI summary
Systems and methods for high frequency impedance spectroscopy detection of daily changes of dielectric properties of the human body to measure body composition and hydration status. According to an aspect, a method at a computing device to determine a set of indirect dynamic human metabolism parameters includes using a sensor on an individual to acquire a set of electrical measurements. The method also includes combining a ratio technique with a canonical model form technique. The also includes performing a series of mathematical calculations on the acquired set of electrical measurements to determine the set of indirect dynamic human metabolism parameters for the individual based on the combined ratio technique and the canonical model form technique. The method further includes generating a trend regarding the set of indirect dynamic human metabolism parameters in response to performing the series of mathematical calculations on the acquired set of electrical measurements to determine the set of indirect dynamic human metabolism parameters for the individual.