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Related Experiment Videos

Pulmonary capillary pressure during exercise in horses

A K Sinha1, R D Gleed, T S Hakim

  • 1Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca 14853, New York, USA.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|May 1, 1996
PubMed
Summary

During exercise, pulmonary capillary pressure significantly increases in horses, indicating greater fluid filtration across lung capillaries. This rise is linked to changes in pulmonary vascular resistance during exertion.

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Area of Science:

  • Cardiovascular Physiology
  • Equine Exercise Physiology

Background:

  • Understanding pulmonary hemodynamics during exercise is crucial for equine athletes.
  • Pulmonary capillary pressure regulation during exertion is not fully elucidated.

Purpose of the Study:

  • To investigate the relationship between pulmonary capillary pressure, arterial pressure, and wedge pressure in horses during exercise.
  • To analyze changes in pulmonary vascular resistance components with increasing exercise intensity.

Main Methods:

  • Measurements of pulmonary vascular pressures using transducer-tip catheters in six Standardbred horses.
  • Exercise protocols at 75%, 90%, and 100% of maximal heart rate.
  • Estimation of pulmonary capillary pressure via the arterial-occlusion technique, adjusted for exercise.

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Main Results:

  • Mean pulmonary arterial, capillary, and wedge pressures significantly increased from rest to maximal exercise.
  • Pulmonary capillary pressure rose to approximately 45 mmHg during maximal exertion.
  • Precapillary resistance increased, while postcapillary resistance decreased substantially with exercise.

Conclusions:

  • The significant rise in pulmonary capillary pressure suggests increased transvascular filtration during equine exercise.
  • Pulmonary vascular resistance decreases during exercise, driven by a reduction in postcapillary resistance.
  • These findings provide insights into the cardiovascular adaptations of horses during strenuous activity.