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Related Experiment Videos

Cardiorespiratory drift during exercise in the horse

D P Thomas1, G F Fregin

  • 1Virginia-Maryland Regional College of Veterinary Medicine, Leesburg 22075, USA.

Equine Veterinary Journal. Supplement
|June 1, 1990
PubMed
Summary
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Horses experience significant cardiovascular and respiratory drift during prolonged submaximal exercise, with ventilation and heart rate increasing over time. A true steady-state was not reached within the exercise duration.

Area of Science:

  • Equine physiology
  • Exercise science
  • Cardiorespiratory function

Background:

  • Understanding physiological responses to exercise is crucial for equine athletes.
  • Cardiovascular and respiratory 'drift' refers to changes in physiological parameters during sustained exercise.
  • Previous research has not fully characterized drift in horses during constant submaximal workloads.

Purpose of the Study:

  • To quantify the time-course and magnitude of cardiovascular and respiratory drift during constant submaximal exercise in horses.
  • To investigate changes in cardiac output, heart rate, ventilation, and blood gases.
  • To determine if a steady-state is achieved during such exercise.

Main Methods:

  • Five mares (Thoroughbred and Morgan) were instrumented for simultaneous measurement of respiratory and blood gases.

Related Experiment Videos

  • Cardiac output (Q) was calculated, alongside heart rate (HR), stroke volume (SV), and ventilation.
  • Data were collected at rest and at 10, 20, and 30 minutes during a constant workload eliciting an initial HR of 150 bpm and a 15-fold VO2 increase.

    • Main Results:

    • Significant increases in ventilation (21%), HR (P < 0.05), and cardiac output (P < 0.05) were observed from 10 to 30 minutes.
    • Stroke volume was maintained, while rectal temperature and mixed venous lactate increased.
    • Arterial oxygen and carbon dioxide partial pressures remained constant.

    Conclusions:

    • Horses exhibit significant cardiac and respiratory drift during strenuous submaximal exercise.
    • A steady-state physiological condition was not achieved within the 30-minute exercise period.
    • If a steady-state exists, it likely occurs very early in the exercise bout.