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Cardiovascular drift during prolonged exercise: new perspectives.

E F Coyle1, J González-Alonso

  • 1Human Performance Laboratory, Department of Kinesiology and Health Education, University of Texas at Austin, Austin, Texas, USA. coyle@mail.utexas.edu

Exercise and Sport Sciences Reviews
|May 8, 2001
PubMed
Summary
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Cardiovascular drift during exercise is mainly caused by a rising heart rate, not increased skin blood flow as body temperature increases. This impacts stroke volume during prolonged physical activity.

Area of Science:

  • Exercise Physiology
  • Cardiovascular Science
  • Thermoregulation

Background:

  • Cardiovascular drift is a phenomenon observed during prolonged exercise.
  • It is characterized by a decline in stroke volume and an increase in heart rate.
  • The underlying mechanisms are debated, with roles for thermoregulation and hydration.

Purpose of the Study:

  • To investigate the primary drivers of cardiovascular drift during sustained exercise.
  • To differentiate the contributions of heart rate and cutaneous blood flow to stroke volume decline.
  • To clarify the physiological response to rising body temperature during exercise.

Main Methods:

  • Utilized physiological monitoring during prolonged exercise protocols.
  • Measured stroke volume, heart rate, and skin blood flow.

Related Experiment Videos

  • Manipulated exercise intensity and environmental conditions to assess responses.

    • Main Results:

    • Observed a progressive decline in stroke volume after 10-20 minutes of exercise.
    • Found that increased heart rate was the primary factor associated with stroke volume reduction.
    • Evidence did not strongly support increased cutaneous blood flow as the main cause.

    Conclusions:

    • Cardiovascular drift is predominantly driven by elevated heart rate, not increased cutaneous blood flow.
    • Rising body temperature during exercise influences cardiovascular regulation.
    • Understanding these mechanisms is crucial for optimizing exercise performance and safety.