Journal
AMERICAN JOURNAL OF VETERINARY RESEARCH
Volume 70, Issue 6, Pages 764-769Publisher
AMER VETERINARY MEDICAL ASSOC
DOI: 10.2460/ajvr.70.6.764
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- Japan Animal Aromatherapy Association
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Objective-To investigate the effect of topical application of undiluted lavender oil on sympathovagal activity in dogs. Animals-5 healthy adult male Beagles. Procedures-An ambulatory ECG monitor (Holter recorder) was placed on each dog (day0), and 48-hour ECGs were recorded, beginning at 8:00 the next day (day 1). Lavender oil (0.18 mL) or saline (0.9% NaCl solution (0.18 mL) was topically applied to the inner pinnas of both ears of all dogs at 8:30, 12:00, 15:30, and 19:00 on day 2. Each trial was duplicated in each dog, with an interval of 3 to 4 days between trials. Spectral indices of heart rate variability, power in the high-frequency range, and the ratio of low-frequency to high-frequency power were calculated as an indirect estimate of autonomic nerve activity. Results-When dogs were treated with lavender oil, the mean heart rate was significantly lower during the period of 19:00 to 22:30 on day 2, compared with the mean heart rate during the same period when dogs were treated with saline solution. On the other hand, high-frequency power during the period of 15:30 to 19:00 was significantly higher when dogs were treated with lavender oil, compared with the high-frequency power during the same period when dogs were treated with saline solution. Conclusions and Clinical Relevance-The study revealed some evidence that topical application of lavender oil affected vagal activity in dogs. However, whether such an effect exists and whether lavender oil has a calming effect on dogs remains equivocal and requires additional investigation. (Am J Vet Res 2009;70:764-769)
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