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Related Experiment Videos

The Tei index and exercise capacity.

J R Libonati1, J Ciccolo, H Glassber G

  • 1Biokinetics Research Laboratory, Temple University, Phyladelphia, PA, USA. jilibonat@astro.temple.edu

The Journal of Sports Medicine and Physical Fitness
|April 24, 2001
PubMed
Summary
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Higher aerobic fitness is linked to a lower Tei index, a measure of cardiac function. This change is primarily due to improved left ventricular diastolic function, specifically reduced isovolumetric relaxation intervals.

Area of Science:

  • Cardiology
  • Exercise Physiology
  • Biomedical Engineering

Background:

  • Cardiac function time intervals are influenced by aerobic fitness.
  • The Tei index is a sensitive cardiac function determinant, elevated in cardiomyopathy.
  • Previous research indicates changes in cardiac function with aerobic conditioning.

Purpose of the Study:

  • To investigate the relationship between the Tei index and aerobic endurance in healthy individuals.
  • To assess how aerobic capacity affects cardiac function time intervals.
  • To explore the role of diastolic function in aerobic fitness.

Main Methods:

  • Seismocardiography was used to measure cardiac function time intervals in 51 healthy subjects.
  • Key measurements included the Tei index, R-R interval, left ventricular isovolumetric contraction interval (LV ICI), left ventricular isovolumetric relaxation interval (LV IRI), and left ventricular ejection time (LVET).

Related Experiment Videos

  • Subjects were grouped based on peak treadmill time (Bruce protocol) to represent varying levels of aerobic endurance.

    • Main Results:

    • A lower Tei index was observed with increased exercise capacity (p < 0.05), mainly due to reduced LV IRI (p < 0.05).
    • Left ventricular ejection time tended to increase with higher treadmill times, potentially influenced by longer R-R intervals in fitter individuals.
    • Even after adjusting for R-R interval, fitter subjects still showed a reduced Tei index and LV IRI, indicating preserved findings.

    Conclusions:

    • Peak treadmill time demonstrates an inverse relationship with the Tei index.
    • Reduced LV IRI is the primary contributor to the observed differences in Tei index related to aerobic fitness.
    • These findings highlight the significant role of left ventricular diastolic function in maintaining aerobic fitness.