Research Of Muscle Rehabilitation Detection Technology Based On Bioelectrical Impedance Measurement

In recent years,the number of aging and disabled population in China is increasing.In the meanwhile,muscle dysfunction is a common disease of this group,which brings new demands for the research and development of rehabilitation services and related medical equipment.Bioelectrical impedance measurement and its related technologies can effectively evaluate the mechanism state of the human body,which have the advantages of non-invasive and real-time monitoring.It is recognized as an ideal solution.The current research on bioelectrical impedance measurement is mainly focused on clinical medical imaging,while the study about the experiment and its application for muscle rehabilitation is few.Based on the theory of biological impedance,this paper designed a bioelectrical impedance electronic measurement system according to the four-electrode method.It Integrated a number of low power chips.Through the simulation and in vivo experiment,the characteristics of human body impedance in different states are discussed,which can find its applications in the field of muscle rehabilitation.The specific contents are arranged as follows:Firstly,based on the principles and methods of bioelectrical impedance measurement,the equivalent circuit model of biological tissue is abstracted.This paper designed a system for bioelectrical impedance measurement,which can detect the impedance and phase of biological tissue.The system includes power management module for single to bipolar circuit conversion,sinusoidal signal generator with adjustable amplitude ranges from 1 V to 10 V and frequency ranges from 50 Hz to 1 MHz,AC small signal constant current source whose output at high precision of ±3%,phase detection and impedance detection module with high sensitivity and accuracy,the MCU.Also,electrical test and functional verification was adopted in the platform.Secondly,we verify the function and took the precision analysis of the electronic system compared to results of the LCR measurement.The error precision of the detection to impedance is below 5%.And for the phase it is below 10%.Based on the designed system,the amplitude-frequency and phase-frequency characteristics of the impedance of the phantom were preliminarily explored,which can provide reference for in vivo experiments.Also,according to the ICNIRP 2010 guidelines,the electric field intensity of<1.35×10-4f V/m at 10kHz-1MHz at the frequency range of 100 kHz to 1MHz were adopted as the evaluation criteria to explore the exposure restrictions of the system.The results show that the signal of frequency above 10 kHz and the excitation current 1mA-3mA is reasonable.Finally,the body impedance measurement in vivo is carried out,and the difference,the amplitude-frequency and phase-frequency characteristic of limbs are analyzed.Based on this,we explore the application of bioelectrical impedance measurement technology in the field of muscle rehabilitation.Referring to the experimental basis measured by four-electrode method,the assessment standards of muscle fatigue was explored with electrical impedance myography(EIM),and two evaluation schemes for muscle fatigue were tentatively proposed:when the muscle electrical impedance falls in the range of 41 ? to 51 ? or its decrease compared with the static initial value reaches to 8 ?,it can be considered that the muscle is in fatigue state.The Surface Electromyography(sEMG)method is used to measure the MNF as a support of the evaluation schemes.This paper is based on the scientific methods to study the related properties of bioelectrical impedance,which is based on the prototype development,and aims to provide ideas and schemes for the application of bioelectrical impedance measurement technology in the field of muscle rehabilitation.