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Mitral annular excursion during exercise in endurance athletes.

Milena Sundstedt1, Pär Hedberg, Egil Henriksen

  • 1Department of Clinical Physiology and Centre of Clinical Research, Uppsala University, Central Hospital, Västerås, Sweden. milena.sundstedt@ltv.se

Clinical Physiology and Functional Imaging
|January 4, 2008
PubMed
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Endurance athletes show increased mitral annular motion during exercise, with no difference between septal and lateral walls at peak exertion. This motion is linked to reduced end-systolic length, not increased ventricular length.

Area of Science:

  • Cardiology
  • Exercise Physiology
  • Echocardiography

Background:

  • Understanding left ventricular (LV) mechanics during exercise is crucial for assessing cardiac function in athletes.
  • Mitral annular motion reflects LV longitudinal function and can be altered by physiological stress.

Purpose of the Study:

  • To quantify left ventricular longitudinal motion at rest and during upright exercise in male endurance athletes.
  • To compare septal and lateral mitral annular motion during varying exercise intensities.

Main Methods:

  • Utilized M-mode and two-dimensional echocardiography in 24 healthy male endurance athletes.
  • Measured mitral annular motion and LV longitudinal axis at end-diastole and end-systole.
  • Assessed cardiac function at rest and during peak upright exercise (heart rate 160 bpm).

Related Experiment Videos

Main Results:

  • Mitral annular motion increased significantly from rest to peak exercise (septal: 68%, lateral: 49%).
  • At peak exercise, septal and lateral annular motion became equal, unlike at rest.
  • LV axial length did not increase, but end-systolic length decreased, explaining annular motion increase.

Conclusions:

  • Upright exercise significantly enhances mitral annular motion in endurance athletes.
  • Septal and lateral mitral annular excursion equalize at peak exercise intensity.
  • The increase in mitral annular motion is primarily due to a decrease in end-systolic ventricular length.