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Related Experiment Videos

Cardiac cycle length variability in ponies at rest and during exercise.

K S Rugh1, B Jiang, D Hatfield

  • 1John M. Dalton Research Center, University of Missouri-Columbia 65211.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|October 1, 1992
PubMed
Summary

Cardiac cycle length variability in ponies significantly decreases with exercise. Atropine reduces resting variability, suggesting parasympathetic system dominance in regulating this variability during exercise.

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Area of Science:

  • Cardiovascular Physiology
  • Equine Exercise Physiology

Background:

  • Cardiac cycle length variability (CCLV) is a key indicator of autonomic nervous system function.
  • Understanding CCLV in athletic animals like ponies is crucial for assessing physiological responses to exercise.

Purpose of the Study:

  • To investigate the impact of strenuous exercise on CCLV in ponies.
  • To determine the effect of atropine premedication on CCLV at rest and during exercise.

Main Methods:

  • Measurements of cardiac cycle length, standard deviation (SDCL), and coefficient of variation (CVCL) were taken in ponies.
  • Ponies were evaluated at rest and during strenuous exercise, both with and without atropine premedication.

Main Results:

  • Exercise significantly reduced CCLV indexes (cardiac cycle length, SDCL, CVCL) in non-premedicated ponies.

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  • Atropine significantly decreased resting cardiac cycle length and variability indexes compared to non-premedicated values.
  • Exercise after atropine reduced cardiac cycle length but did not significantly alter SDCL or CVCL.

    • Conclusions:

    • Strenuous exercise nearly abolishes cardiac cycle length variability in ponies.
    • Parasympathetic nervous system activity is the primary mediator of cardiac cycle length variability in ponies, particularly during exercise.