The EMG signal was recorded simultaneously from brachioradialis,biceps,deltoid and trapezius then analyzed with amplitude,spectrum or combined indices called the joint analysis of EMG spectrum and amplitude(JASA).

• 同时遥测记录肱桡肌、肱二头肌、三角肌、斜方肌的表面肌电信号,采用时域、频域及肌电术振幅频谱联合分析方法(the joint analysis of EMG spectrum and amplitude,JASA)的指标进行分析。