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Related Experiment Videos

Left ventricular function in endurance runners during exercise

M Jensen-Urstad1, F Bouvier, M Nejat

  • 1Department of Cardiology, Karolinska Hospital, Stockholm, Sweden.

Acta Physiologica Scandinavica
|November 7, 1998
PubMed
Summary
This summary is machine-generated.

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Elite runners exhibit enhanced left ventricular systolic function, with higher ejection fraction at rest and during exercise compared to controls. This improved cardiac performance is linked to increased myocardial contractility, maintaining stroke volume during exertion.

Area of Science:

  • Cardiology
  • Exercise Physiology
  • Sports Medicine

Background:

  • Elite athletes often display distinct cardiovascular adaptations.
  • Understanding left ventricular function is crucial for assessing cardiac health in athletes.

Purpose of the Study:

  • To compare left ventricular (LV) function between elite runners and sedentary controls.
  • To investigate the impact of exercise intensity on cardiac performance in trained versus untrained individuals.

Main Methods:

  • Nuclear angiocardiography was used to assess LV function.
  • Participants included 15 middle- to long-distance runners and 10 controls.
  • Measurements were taken at rest and during incremental exercise.

Main Results:

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  • Runners demonstrated a higher ejection fraction (EF) at rest and during exercise compared to controls.
  • Stroke volume was maintained across exercise intensities in runners, supported by increased peak filling and emptying rates.
  • Both groups showed similar regulatory mechanisms, including the Frank-Starling mechanism, during early exercise stages.

Conclusions:

  • Endurance-trained athletes possess superior systolic function, evidenced by higher EF.
  • Enhanced myocardial contractility contributes to maintaining stroke volume during exercise in elite runners.
  • Cardiovascular regulatory mechanisms appear conserved between trained athletes and healthy controls.