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Bronchial circulation during prolonged exercise in ponies.

M Manohar1, S E Duren, B P Sikkes

  • 1Department of Veterinary Biosciences, College of Veterinary Medicine, University of Illinois, Urbana 61801.

American Journal of Veterinary Research
|June 1, 1992
PubMed
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During exercise, bronchial blood flow in ponies increased with rising pulmonary arterial blood temperature. Renal blood flow initially remained stable but later showed vasoconstriction, while tracheal blood flow saw only slight increases.

Area of Science:

  • Cardiovascular Physiology
  • Equine Exercise Physiology

Background:

  • Understanding blood flow dynamics during exercise is crucial for equine health.
  • Previous research has not fully elucidated the specific circulatory responses in different organs of ponies during strenuous activity.

Purpose of the Study:

  • To investigate the impact of exercise on tracheal, bronchial, and renal blood flow in healthy ponies.
  • To correlate changes in blood flow with physiological parameters like heart rate, aortic pressure, and blood temperature.

Main Methods:

  • Eight healthy ponies underwent treadmill exercise (20.8 km/h, 7% grade) for 30 minutes.
  • Blood flow was measured using radionuclide-labeled microspheres injected into the left ventricle at rest and during exercise.
  • Heart rate, mean aortic pressure, and pulmonary arterial blood temperature were continuously monitored.

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Main Results:

  • Bronchial blood flow significantly increased during exercise, correlating with elevated pulmonary arterial blood temperature.
  • Tracheal blood flow showed only a slight increase and remained lower than bronchial blood flow.
  • Renal blood flow was unchanged initially but exhibited vasoconstriction at later stages of exercise.

Conclusions:

  • Exercise stimulates vasodilation in bronchial circulation, closely linked to increased pulmonary arterial blood temperature in ponies.
  • Renal circulation adapts to prolonged exercise through vasoconstriction.
  • Tracheal blood flow response to exercise is minimal compared to bronchial circulation.