Biometric Muscle Monitoring via Impedance Phase Angle
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Solution Overview
Problem
Existing biometric information acquisition methods struggle to accurately and efficiently measure changes in muscle mass and exercise effects, particularly in recognizing muscle activation and recovery rates, due to limitations in measuring bioelectrical impedance changes.
Innovation Solution
A biometric information acquisition method and system that apply an electrical signal, specifically an AC voltage, to an organism's muscle via a pair of electrodes, measuring the change rate of the impedance's phase angle to quantify muscle mass, activation, and recovery, using a computer system to process and output the acquired data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional bioelectrical impedance measurement methods are used, then basic body composition can be calculated, but the ability to accurately recognize muscle activation and recovery rates is insufficient
Solution Approach 1:
The patent applies parameter changes by using multiple frequency electrical signals (e.g., 5 Hz, 50 Hz, 500 Hz, 5 kHz) instead of a single frequency. By measuring impedance across different frequencies and analyzing the phase angle changes, the system can detect subtle variations in muscle tissue properties that indicate activation and recovery states, thereby improving measurement precision for muscle condition monitoring.
2Measurement precision
If simple impedance measurement is used, then the measurement process is simple, but the ability to detect muscle changes is insufficient
Solution Approach 1:
The system changes the frequency parameter of the electrical signal to multiple values and measures impedance at each frequency. By analyzing the phase angle differences across frequencies, the system can detect muscle mass changes and activation states without requiring complex hardware modifications, thus improving detection capability while maintaining relatively simple device architecture.
Solution Approach 2:
The patent uses phase angle as an intermediary parameter to translate raw impedance measurements into meaningful muscle condition information. The phase angle, derived from the ratio of reactive to resistive impedance components, serves as a mediator that reflects cell membrane integrity and tissue composition changes, enabling indirect but accurate detection of muscle activation and recovery without directly measuring muscle properties.
3Measurement precision
If single-frequency electrical signal is applied, then the measurement is quick and simple, but the accuracy in recognizing muscle condition changes is limited
Solution Approach 1:
The system applies electrical signals at multiple frequencies (e.g., low frequency 5-50 Hz and high frequency 500 Hz-5 kHz) to capture different aspects of tissue impedance characteristics. By processing the phase angle data from these multiple frequency measurements, the system achieves more accurate muscle condition recognition, accepting a longer measurement time as a necessary trade-off for improved precision.
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 allows for precise measurement of muscle mass changes, activation rates, and recovery rates, enabling effective monitoring of exercise effects and muscle condition, facilitating personalized exercise planning and recovery assessment.
Implementation Method 1
measuring a change rate with respect to an impedance of the electrical signal applied in the application step
Data Source
AI summary
A biometric information acquisition method according to the present disclosure includes an application step and an acquisition step. The application step includes applying an electrical signal to an organism’s muscle. The acquisition step includes acquiring information about the organism’s muscle as biometric information based on a change rate with respect to an impedance of the electrical signal applied in the application step.