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Related Experiment Videos

Prolonged exercise induces left ventricular dysfunction in healthy subjects.

J L Vanoverschelde1, L T Younis, J A Melin

  • 1Division of Cardiology, University of Louvain Medical School, Brussels, Belgium.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|March 1, 1991
PubMed
Summary
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Moderately prolonged exercise, like a 20-km run, can temporarily reduce left ventricular systolic performance in healthy individuals. This finding highlights potential cardiac effects of endurance activities.

Area of Science:

  • Cardiology
  • Exercise Physiology
  • Sports Medicine

Background:

  • Understanding the impact of exercise duration on cardiac function is crucial for athletes and clinicians.
  • Previous research has explored acute exercise effects, but moderately prolonged activities require further investigation.

Purpose of the Study:

  • To investigate the effects of a 20-km run (moderately prolonged exercise) on left ventricular systolic performance in healthy males.
  • To assess changes in cardiac function immediately following prolonged exercise compared to brief exercise.

Main Methods:

  • Utilized M-mode, 2D, and Doppler echocardiography, plus carotid pulse tracings.
  • Assessed left ventricular systolic function using end-systolic stress-shortening relationships.
  • Compared measurements at rest versus immediately after brief treadmill exercise and a 20-km run.

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Main Results:

  • Prolonged exercise decreased mean arterial pressure and left ventricular end-diastolic volume.
  • Ejection fraction and mean velocity of fiber shortening significantly decreased post-exercise, indicating depressed systolic function.
  • These functional declines occurred despite reduced end-systolic wall stress and were independent of preload changes.

Conclusions:

  • Moderately prolonged exercise can lead to transiently depressed left ventricular systolic performance in healthy individuals.
  • The observed cardiac depression suggests a need for awareness regarding endurance exercise impacts on heart function.