1972年Chirife等首创用耳密度图法代替颈动脉图(CPT)于安静及运动状态下测定心缩间期(STI),认为两者密切相关,但国内迄今很少报道。本文采用耳密度图导数图(下称EPT)与CPT、心电图(ECG)、心音图(PCG)同步描记,于坐位踏车运动中监测STI的动态变化。目的是进一步验证用EPT取代CPT的可靠性,同时测定一部分正常国人的运动负荷中STI数值, In 1972, Chirife and other pioneers using ear density map instead of carotid artery map (CPT) in the quiet and exercise state determination of systolic (STI), that the two are closely related, but so far rarely reported. In this paper, the dynamic changes of STI in sitting exercise were monitored by ear trait map derivative graph (EPT) and CPT, electrocardiogram (ECG) and phonocardiogram (PCG). The purpose is to further verify the reliability of replacing CPT with EPT and to determine the STI value of some normal people in exercise load,