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Related Experiment Videos

Renal tubular function in horses during submaximal exercise.

K H McKeever1, K W Hinchcliff, L M Schmall

  • 1Department of Veterinary Clinical Sciences, Ohio State University, Columbus 43210.

The American Journal of Physiology
|September 1, 1991
PubMed
Summary
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Submaximal exercise in horses significantly increases urine flow and sodium excretion, linked to elevated atrial natriuretic peptide levels. This study explores exercise physiology and renal function in equine athletes.

Area of Science:

  • Equine Exercise Physiology
  • Renal Function in Animals
  • Endocrinology

Background:

  • Understanding how exercise impacts physiological systems is crucial for athletic performance and health.
  • Renal function plays a key role in fluid and electrolyte balance, which can be significantly altered during physical exertion.

Purpose of the Study:

  • To investigate the effects of steady-state submaximal treadmill exercise on renal function in unfit mares.
  • To determine the relationship between exercise-induced changes in renal parameters and key hormones like atrial natriuretic peptide, renin, aldosterone, and vasopressin.

Main Methods:

  • Six unfit mares underwent steady-state submaximal treadmill exercise (1 hour at 55-60% maximal heart rate, 6-degree incline) in a crossover design.
  • Plasma and urine samples were collected to measure osmolality, electrolyte concentrations (Na+, K+, Cl-), urine flow, excretion rates, clearances, and hormonal levels (atrial natriuretic peptide, renin activity, aldosterone, vasopressin).

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Main Results:

  • Exercise significantly increased plasma osmolality, potassium, urine flow, sodium excretion, and osmotic and sodium clearances.
  • Significant decreases were observed in plasma chloride, chloride excretion, and chloride clearance.
  • Hormonal analysis revealed significant increases in atrial natriuretic peptide, plasma renin activity, plasma aldosterone concentration, and vasopressin concentration during exercise.

Conclusions:

  • Submaximal exercise in horses leads to substantial increases in urine flow and sodium excretion.
  • These renal changes are associated with concurrent elevations in plasma atrial natriuretic peptide, suggesting its role in regulating fluid and electrolyte balance during exercise in horses.