Study On Bioimpedance Measurement Method For Portable Muscle Fatigue Monitoring

Muscle fatigue testing is an important research topic in the field of biomedicine.It has broad application prospects in the fields of physiological and pathological analysis,sports health,and training injury prevention.However,there is no relatively uniform muscle fatigue test standard at this stage.The exercise damage caused by muscle fatigue can only be detected by nuclear magnetic resonance.This method has the disadvantages of expensive equipment,long-term detection,and can only detect the damage that has occurred.No functional changes in muscle before injury can be found.Bioelectrical impedance measurement technology is a non-invasive detection technology for extracting physiological and pathological information.The advantage of this technology is that it can be functionally evaluated on the state of the body through the rich information carried by the bioelectrical impedance.Due to its non-invasive,safe,non-ionizing radiation and low cost,it has potential application value and technical advantages in solving the problem of muscle fatigue detection.Based on bioelectrical impedance measurement technology,this paper designs and implements a wearable muscle electrical impedance measurement system for monitoring the application of muscle fatigue.The main work of the thesis is as follows:In the second chapter,based on the analysis of the principle of impedance measurement,the overall design of the muscle impedance measurement system is proposed,including function definition,system composition and performance index.This chapter firstly introduces the three-element model and the Cole-Cole theory in the principle of impedance measurement.Then it introduces four main methods of impedance measurement.Finally,the overall design of the impedance measurement system is refined from the aspects of function definition,design requirements,and system modules.The third chapter studies the hardware design of the muscle impedance measurement system,including the measurement electrode array design and measurement circuit design.This chapter firstly proposes the overall architecture of the hardware system,and clarifies the interconnection and interoperability of various parts of the hardware system.The electrode array is then designed from the perspective of electrode material selection,electrode array substrate material.Finally,the hardware design of the measurement circuit is introduced in detail from six aspects: switch matrix,data processing circuit,single-chip control circuit,power supply,serial communication and Bluetooth communication.The fourth chapter designs the software of the muscle impedance measurement system.The software part mainly includes two aspects of embedded software and host computer program.This chapter firstly introduces the system software architecture and workflow,then introduces the design of the system main control module,communication module,measurement module,switch module,and finally introduces the workflow and user interface of the PC software.The fifth chapter tests the overall function and performance of the system and designs the human body test for muscle impedance measurement.The system measurement accuracy test and the speed test were performed based on the standard resistance.Data from changes in muscle impedance were then analyzed by human trials.The muscle fatigue electrical impedance measurement system studied in this paper provides a new idea for muscle fatigue monitoring,which is expected to promote the improvement of muscle fatigue from qualitative to quantitative,from post-test to realtime in-vivo monitoring,has a strong application value.