Abstract
Sixty normal men, aged 26 to 64, had simultaneous external phonocardiograms at the apex, external right carotid arterial pulse tracings and electrocardiograms obtained in the supine position at rest, immediately after exercise and 3 minutes after exercise. Each subject exercised in the upright position on a bicycle ergometer at a load of 60 watts. The mean external isovolumic contraction time (EICT) was 0.041 ± 0.006 second at rest, 0.025 ± 0.005 second immediately after exercise and 0.036 ± 0.006 second 3 minutes after exercise. The mean left ventricular ejection time/external isovolumic contraction time (LVET/EICT) ratio was 7.4 ± 1.3 at rest, 11.0 ± 2.2 immediately after exercise and 8.2 ± 1.5 3 minutes after exercise.
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