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Heart rate variability during exercise in the horse

J F Thayer1, A W Hahn, M A Pearson

  • 1Department of Psychology, University of Missouri-Columbia 65211, USA.

Biomedical Sciences Instrumentation
|January 1, 1997
PubMed
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Higher heart rate variability (HRV) in horses indicates better autonomic control. This study found HRV decreases during exercise, with significant individual differences in parasympathetic activity, suggesting complex responses to physical demands.

Area of Science:

  • Equine physiology
  • Autonomic nervous system function
  • Cardiovascular regulation

Background:

  • High heart rate variability (HRV) is linked to efficient autonomic control and adaptability.
  • Previous equine studies using spectral analysis suggested increased HRV reflects effective vagal control.
  • Understanding HR and HRV responses to dynamic exercise is crucial for equine health and performance.

Purpose of the Study:

  • To characterize equine heart rate (HR) and HRV during a graded exercise test with increasing and decreasing workloads.
  • To investigate individual differences in autonomic responses during physical exertion in horses.
  • To explore the applicability of nonlinear dynamical models for describing equine HR fluctuations.

Main Methods:

  • Non-invasive ambulatory monitoring of HR and HRV in horses.

Related Experiment Videos

  • Horses exercised on a high-speed treadmill, progressing through walk, trot, and canter/fast trot, followed by a decreasing workload phase.
  • Data collected during a 5-minute baseline, exercise periods, and a 5-minute recovery period.

    • Main Results:

    • HRV decreased significantly during exercise compared to baseline and recovery.
    • Substantial individual variations in parasympathetic activity were observed during exercise.
    • HR fluctuation patterns suggested that nonlinear dynamical models might offer a more complete description than traditional models.

    Conclusions:

    • Equine HRV diminishes under physical stress, highlighting the dynamic nature of autonomic regulation.
    • Individual variability in parasympathetic responses is a key factor in equine exercise physiology.
    • Nonlinear dynamics may provide a more nuanced understanding of cardiovascular responses in exercising horses.