Research And Design Of Forearm Muscle Balance Training Device Based On TRIZ Theory

Forearm muscle strength imbalance can trigger joint instability and lead to muscle compensation,which increases the risk of sports injury and affects sports performance.At present,isokinetic muscle strength training and tester is used for muscle training and functional evaluation,but due to the high price,small number of equipment,difficulty in making appointments,and complex instrument operation,it is mainly used clinically for muscle function testing.The various types of arm,wrist and grip strength devices on the market are mainly for training functions and lack an emphasis on training feedback.Therefore,it is necessary to develop a low-cost forearm muscle training and evaluation device.Through literature research,this project summarizes the etiology,clinical treatment methods and muscle strength assessment methods of forearm muscle imbalance,summarizes and refines user needs through expert interviews and user interviews,analyzes the defects of the wrist force system based on the functional analysis and causal chain analysis of TRIZ theory,uses the principle of physical contradiction and separation,the object-field model and the standard solution,the technical contradiction and the Altshuller matrix to solve,and finally establishes the principle of dimension change,the principle of time separation,and the principle of intermediaries.The principle of local mass and the object-field model introducing strain effect are deepened for the optimal solution,and a forearm muscle strength balance training device with resistance adjustment function is designed to realize multi-directional resistance training of wrist flexion,wrist extension,ulnar deviation,radial deviation,pronation and supination,and a forearm muscle strength test and evaluation system based on the Arduino platform is built to realize the measurement and evaluation of forearm muscle strength and muscle strength balance.The study was conducted to verify the effectiveness of the forearm muscle balance training device through surface electromyography and grip strength tests.Fourteen subjects were randomly divided into experimental group and control group,respectively using forearm muscle strength training device and wrist force for two weeks wrist flexion and wrist extension training.The grip strength of the dominant side of the subject was collected by the CAMRY electronic hand dynamometer before and after the training.The Mangold-10 physiological multi-conduction instrument and Biotrace+ software were used to collect the surface electromyographic signals of flexor carpi radialis(FCR),extensor carpi ulnar(ECU),extensor carpi radialis longus(ECRL)and brachioradialis(BR)during the maximum isometric contraction of the subject’s wrist flexor and extension.It was imported into MATLAB R2020 b for preprocessing and feature extraction.Finally,the grip strength,grip body mass index,RMS,i EMG and MBI before and after training were imported into IBM SPSS Statistics 26 for independent sample t-test and paired t-test.The results showed that the grip strength and grip body mass index,FCR of wrist flexion,RMS of ECU,i EMG of FCR and RMS of wrist extension ECU of the experimental group after training were higher than those before training(P < 0.05),the RMS of ECRL and MBI of wrist extension were significantly higher than those before training(P < 0.01),and the MBI of flexion and extension of wrist was better than that of control group(P < 0.05).There were no significant differences in grip strength,grip body mass index,MBI of wrist flexion and wrist extension in control group before and after training(P > 0.05),RMS and i EMG of wrist flexion BR were higher than those before training(P < 0.05).In this study,the forearm muscle strength balance training device designed based on TRIZ theory can effectively improve the muscle recruitment ability of forearm flexor and extensor muscle group,enhance the level of grip strength,and have significant advantages in improving the degree of forearm muscle strength imbalance,which has practical significance in preventing joint instability caused by forearm muscle strength imbalance and reducing the risk of sports injury.It provides a design idea for the design of forearm muscle strength training device and enriched the design practice of TRIZ theory in the technical field of medical rehabilitation equipment.