The cardiac cycle events of normal male Koreans were measured in thirty subjects with age of 26. 3 (21^´31) year by noninvasive technique, i.e. simultaneous recording of ECG, PCG, ACG and Carotid arteiral pulse tracing by Hewlett Packard . ECG/Phono system 1514 c with paper speed 50 mm/ sec. The mean values of observed data are as follows and the mean values corrected for the heart rate by Bazett´s formula are in parentheses.
Electromechanical lag(EML): 30(31.5)msec, Q-IM interval: 58.1 (60.7)msec, Preejection period(PEP): 78.2(82.1)msec, Preejection component I (PEC
I ): 34. 5(36. 7)msec, Pree jection component 11 (PEC
11): 24.6(25.8 )msec, Isovolumic contraction time (IVCT): 49(51.8)msec, Ejection time (ET): 305(321. 5)msec, Maximum ejection time (MET): 101.2 (107)msec, Reduced ejection time (RET)? 204. 1
(214.9)msec, Isovolumic relaxationtime (IVRT): 81.3(85.7)msec, Rapid filling time(RFT): 103.8 (109.2)msee, Slow filling time (SFT): 378.2(394) msec, Mechanical systole (MS): 347.9(366.8)msec, Electromechanical systole (EMS):377.8(398.3)msec, PEP/ET: 0.256(0.-194´ ´0.379), ET/IVCT: 6.62(4^ it 11.78),. Ejection time index(ETI): 413.4.
Regression equations:
ET=0.36786 -0. 000935 X heart rate PEP=0.10143-0.00035Xheart rate
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