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      A Polygraphic Study of Systolic Time Intervals and Their Correlations with Heart Rate and Workload during Supine Ergometry in One Hundred Normal Subjects

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          Abstract

          The present study was designed to investigate systolic time intervals (STI) in 100 normal subjects undergoing continuous-maximal supine cycle ergometry and to search for possible linear correlations between STI (dependent variables) and heart rate, diastolic blood pressure, systolic blood pressure, age, sex, weight, and height (independent variables), by stepwise regression analysis. The only significant correlation discovered in the study was between the contractility index (isometric contraction time - ICT) and the total work produced by each participant. Exercise tolerance was limited primarily by shortening of the ICT interval, all subjects discontinuing the test when ICT reached 13.7 ± 7 ms.

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          Author and article information

          Journal
          CRD
          Cardiology
          10.1159/issn.0008-6312
          Cardiology
          S. Karger AG
          0008-6312
          1421-9751
          1988
          1988
          11 November 2008
          : 75
          : 2
          : 133-144
          Affiliations
          Division of Emergency Medicine, Ospedale Maggiore Policlinico Teaching Hospital, Milan, Italy
          Article
          174360 Cardiology 1988;75:133–144
          10.1159/000174360
          3370655
          © 1988 S. Karger AG, Basel

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          Page count
          Pages: 12
          Categories
          Exercise Testing and Rehabilitation

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