In:
American Journal of Veterinary Research, American Veterinary Medical Association (AVMA), Vol. 62, No. 1 ( 2001-01-01), p. 37-42
Abstract:
Objective —To determine characteristics of power
spectral analysis of heart rate variability (HRV) during a 24-hour period in dogs and to evaluate the effects of
vagal and sympathetic tone on HRV. Animals —16 healthy adult Beagles. Procedure —Power spectral analysis of HRV was conducted, using 24-hour ambulatory ECG recordings.
Circadian rhythms were evaluated in terms of absolute units of low-frequency (LF) and high-frequency
(HF) powers, their ratio (LF:HF), and their adjusted (normalized) units (LF[norm] and HF[norm] ).
Three or 4 dogs were used for simultaneous measurement of heart rate and respiratory waveform as
well as to evaluate treatment (propranolol, atropine, or both) administered to cause blockade of the autonomic
nervous system. Results —Values for LF and HF powers, LF:HF,
LF(norm), and HF(norm) had obvious rhythmicity in clinically normal dogs. The HF power of HRV in dogs
was extremely high, compared with that of other species, and HF peaks corresponded to peaks
obtained from respiratory waveforms. Blockade of the autonomic nervous system documented that
HRV in dogs was mostly attributable to vagal activity. Conclusion and Clinical Relevance —We determined
characteristics of power spectral analysis of HRV in dogs, including circadian rhythm of the autonomic
nervous system. Power spectral analysis of HRV may provide a useful noninvasive technique for
assessing the effect of drugs on activity of the autonomic nervous system in dogs. ( Am J Vet Res 2001;62:37–42)
Type of Medium:
Online Resource
ISSN:
0002-9645
DOI:
10.2460/ajvr.2001.62.37
Language:
Unknown
Publisher:
American Veterinary Medical Association (AVMA)
Publication Date:
2001
detail.hit.zdb_id:
2056942-7
SSG:
22
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