为了验明PCGET方法的可信度 ,作者进行了该心音图运动试验中的信噪比分析。对 30个志愿者进行了PCGET ,运动后基带幅值的平均值与运动前基带幅值平均值的比值为 1.150 ;各受试者运动后S1幅值对运动前S1幅值的倍数的平均值为 10 .57,这表明 ,PCGET提高了信 /噪比 ,心内噪声、心胸系统传播过程中产生的噪声、呼吸噪声、肌肉噪声和环境噪声没有妨碍PCGET的应用。PCGET可作为心力储备的无伤性、简便、低代价的量化测评方法 In order to verify the credibility of the PCGET method, the author performed the SNR analysis in the phonocardiogram exercise test. PCGET was performed on 30 volunteers. The ratio of the average of the baseband amplitude after exercise to the average of the pre-exercise baseband amplitude was 1.150; the average of the multiples of the S1 amplitude before exercise to the pre-exercise S1 amplitude after each exercise. It is 10.57, which shows that PCGET improves the signal/noise ratio, and the intracardiac noise, noise generated during the propagation of the cardiothoracic system, respiratory noise, muscle noise, and environmental noise do not prevent the use of PCGET. PCGET can be used as a noninvasive, simple, low-cost method for quantitative assessment of cardiac reserve