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      Systolic Time Intervals at Rest and during Exercise

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          Abstract

          Measurements of the electromechanical systole (QS<sub>2</sub>) and its components: electromechanical delay (QS<sub>1</sub>), isovolumic contraction time (ICT), and left ventricular ejection time (LVET), were conducted on 30 healthy men at rest and during exercise of varying intensity. The measurements were performed through simultaneous, non-invasive recordings of the electrocardiogram, phonocardiogram, and carotidogram. The conclusions are: (1) QS<sub>2</sub> and its components are principally correlated to the duration of the cardiac cycle (RR); (2) in changing posture from supine to sitting, the mean QS<sub>t</sub> and mean ICT tend to increase, but these changes are not statistically significant. LVET and QS<sub>2</sub> are both significantly shortened; (3) during exercise there is a decrease in the mean values of QS<sub>1’</sub> ICT, LVET, and QS<sub>2</sub>. The degree of LVET shortening is not as great as predicted by the ‘resting’ regression equation; (4) variations in arterial blood pressure and work load do not significantly affect systolic time intervals; (5) the effect of age on systolic time intervals is difficult to assess and needs further investigation.

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          Author and article information

          Journal
          CRD
          Cardiology
          10.1159/issn.0008-6312
          Cardiology
          S. Karger AG
          0008-6312
          1421-9751
          1974
          1974
          29 October 2008
          : 59
          : 3
          : 133-153
          Affiliations
          Departments of Physiology and Rehabilitation, Baylor College of Medicine, and Texas Institute for Rehabilitation and Research, Houston, Tex.
          Article
          169672 Cardiology 1974;59:133–153
          10.1159/000169672
          4447951
          © 1974 S. Karger AG, Basel

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          Page count
          Pages: 21
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