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Related Experiment Videos

QT dispersion in athletic left ventricular hypertrophy.

J Mayet1, P Kanagaratnam, M Shahi

  • 1Department of Cardiology and Peart-Rose Clinic, St. Mary's Hospital, Paddington, London, UK.

American Heart Journal
|March 31, 1999
PubMed
Summary

Physiologic left ventricular hypertrophy from athletic training does not increase QT length or dispersion. Endurance athletes and soccer players showed no significant differences in QT parameters compared to controls.

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Area of Science:

  • Cardiology
  • Sports Medicine
  • Physiology

Background:

  • Athletic training induces cardiac remodeling, including left ventricular hypertrophy (LVH).
  • Understanding the electrical consequences of training-induced LVH is crucial for athlete safety.
  • Previous research has not definitively established the relationship between physiologic LVH and cardiac electrical stability.

Purpose of the Study:

  • To investigate if physiologic left ventricular hypertrophy (LVH) from physical training is linked to increased QT interval length or dispersion.
  • To compare QT parameters in elite athletes with those in control subjects.

Main Methods:

  • Assessed 33 subjects: international endurance athletes, professional soccer players, and control subjects.
  • Utilized 2-dimensional echocardiography to measure left ventricular mass index.

Related Experiment Videos

  • Performed 12-lead electrocardiography to evaluate QT length and dispersion parameters.

    • Main Results:

    • Endurance athletes and soccer players exhibited significantly greater left ventricular mass index compared to controls.
    • Despite increased cardiac structure in athletes, no significant differences were found in QT dispersion, QTc dispersion, maximum QT, or maximum QTc between athlete groups and controls.
    • QT parameters remained within normal limits across all groups, irrespective of LVH severity.

    Conclusions:

    • Left ventricular hypertrophy resulting from athletic training does not appear to be associated with a significant increase in QT length or QT dispersion.
    • Physiologic cardiac remodeling in athletes does not predispose them to QT-related arrhythmias.
    • These findings suggest that training-induced LVH is electrically benign.