本课题包括3个子课题：1）股四头肌等速向心收缩时肌电图的测定与分析；2）膝关节练习器坐位伸膝练习股四头肌肌电图的双侧对比；3）膝关节损伤患者股四头肌肌电图分析。膝关节练习器坐位伸膝练习股四头肌肌电图的双侧对比根据第一部分研究结果，股四头肌肌电图有明显个体差异 This topic includes three sub-topics: 1) quadriceps isokinetic concentric contraction ECG determination and analysis; 2) knees exercise knee extension exercise quadriceps EMG bilateral contrast; 3 Electromyographic analysis of quadriceps femoris in patients with knee joint injury. Knee joint exercise knee extension exercise quadriceps electromyography bilateral comparison According to the first part of the study, quadriceps electromyography significant individual differences