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Effect of Aromatherapy on Equine Heart Rate Variability.

Ann Linda Baldwin1, Isabelle Chea2

  • 1Department of Physiology, University Medical Center, University of Arizona, Tucson, AZ; Laboratory for the Advances in Consciousness and Health, Department of Psychology, University of Arizona, Tucson, AZ.

Journal of Equine Veterinary Science
|July 2, 2019
PubMed
Summary

Aromatherapy with lavender essential oil effectively calms horses by increasing heart rate variability (HRV), specifically the parasympathetic component (RMSSD). Chamomile aromatherapy did not show significant calming effects in this study.

Keywords:
AromatherapyChamomileEquineHeart rate variabilityHorseLavender

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Area of Science:

  • Veterinary Medicine
  • Animal Behavior
  • Complementary Therapies

Background:

  • Horses are sensitive animals prone to stress.
  • Aromatherapy has demonstrated potential benefits for equine well-being.
  • Essential oils possess olfactory properties that may influence physiological responses.

Purpose of the Study:

  • To investigate the impact of aromatherapy on the parasympathetic component of heart rate variability (HRV) in horses.
  • To evaluate the efficacy of lavender and chamomile essential oils as calming agents for equine use.

Main Methods:

  • A crossover study design was employed with eight dressage horses.
  • Horses received humidified lavender (Lavandula angustifolia) or chamomile (Matricaria recutita) essential oil, or humidified air as a control.
  • Heart rate variability (HRV) was measured for 7 minutes before, during, and after treatments, with a 30-minute post-treatment follow-up.

Main Results:

  • Lavender oil significantly increased the root mean square of successive differences (RMSSD), a marker of parasympathetic activity, immediately post-treatment (P = .020).
  • Lavender also reduced very low-frequency HRV oscillations (P = .039), indicating a calming effect.
  • Chamomile oil produced variable results with no statistically significant impact on HRV.

Conclusions:

  • Lavender aromatherapy can be an effective method for transiently calming horses.
  • The parasympathetic nervous system's activity in horses can be modulated by lavender essential oil.
  • Further research into chamomile's effects and other essential oils for equine calming is warranted.