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Left ventricular response to dynamic exercise in young cyclists.

Thomas Rowland1, Viswanath Unnithan, Bo Fernhall

  • 1Department of Pediatrics, Baystate Medical Center, Springfield, MA 01199, USA.

Medicine and Science in Sports and Exercise
|April 5, 2002
PubMed
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Highly trained young cyclists exhibit enhanced cardiac function compared to non-trained boys. Their hearts show larger dimensions and greater maximal stroke volume, indicating superior endurance capacity.

Area of Science:

  • Cardiovascular Physiology
  • Pediatric Exercise Science
  • Sports Cardiology

Background:

  • Endurance athletes often display distinct cardiac adaptations.
  • Understanding these adaptations in young athletes is crucial for exercise science.
  • Previous research has focused less on adolescent endurance athletes.

Purpose of the Study:

  • To compare cardiac dimensional and physiological responses to exercise.
  • To investigate differences between highly trained young male cyclists and untrained boys.
  • To identify factors contributing to enhanced cardiac output in young athletes.

Main Methods:

  • Two-dimensional and Doppler echocardiography were used to measure ventricular dimensions and stroke volume.
  • Participants underwent a progressive maximal upright cycle ergometer test.

Related Experiment Videos

  • Cardiac measurements were taken at rest and during exercise.

    • Main Results:

    • Cyclists had larger relative left ventricular dimensions at rest compared to non-athletes.
    • Maximal stroke index and cardiac index were significantly higher in cyclists.
    • Both groups showed a similar pattern of stroke volume response during exercise.

    Conclusions:

    • Young endurance athletes possess enhanced cardiac dimensions and function.
    • Greater maximal stroke volume in athletes is linked to improved resting left ventricular diastolic filling (preload).
    • These findings highlight the cardiac adaptations to intense training in adolescents.