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Left ventricular function during interval and steady state exercise.

C Foster1, K Meyer, N Georgakopoulos

  • 1Milwaukee Heart Institute, WI, USA. foster@mail.uwlax.edu

Medicine and Science in Sports and Exercise
|August 17, 1999
PubMed
Summary
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Interval training (INT) and steady-state (SS) exercise show similar left ventricular (LV) function. This study found comparable LV ejection fraction and hemodynamic responses during INT and SS exercise in healthy volunteers.

Area of Science:

  • Cardiovascular Physiology
  • Exercise Science

Background:

  • Interval training (INT) is widely used in athletic and clinical settings.
  • Left ventricular (LV) function during steady-state (SS) exercise is understood, but data during INT are lacking.

Purpose of the Study:

  • To investigate and compare left ventricular (LV) function during interval training (INT) versus steady-state (SS) exercise.
  • To determine if INT significantly alters LV function compared to SS exercise.

Main Methods:

  • Eight healthy volunteers performed 15 minutes of upright cycle ergometry under both INT and SS conditions at 90% of their individual anaerobic threshold.
  • First-pass radionuclide ventriculography was used to measure LV function.
  • Measurements were taken during specific work and recovery intervals for INT and compared to temporally matched SS exercise.

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Main Results:

  • LV ejection fraction increased significantly from rest during both INT and SS exercise.
  • No significant differences in LV ejection fraction were observed between INT and SS at comparable time points.
  • Other hemodynamic parameters, including heart rate, blood pressure, and cardiac output, were similar between INT and SS conditions.

Conclusions:

  • The hemodynamic response and left ventricular (LV) function during interval training (INT) are comparable to steady-state (SS) exercise.
  • These findings suggest that INT does not substantially alter LV function compared to SS exercise in healthy individuals.