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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

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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).

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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.