Repeatability and reliability of heart rate variability in healthy, adult pony mares

dc.contributor.authorVan Vollenhoven, Elize
dc.contributor.authorGrant, C.C. (Catharina Cornelia)
dc.contributor.authorFletcher, Lizelle
dc.contributor.authorGanswindt, Andre
dc.contributor.authorPage, Patrick Collin
dc.contributor.emailelize.vanvollenhoven@up.ac.zaen_ZA
dc.date.accessioned2016-11-10T06:04:08Z
dc.date.issued2016-11
dc.description.abstractHeart rate variability (HRV) is an important non-invasive method to quantify stress by measuring sympathetic and parasympathetic activity of the autonomic nervous system. Few studies exist on the repeatability and reliability of HRV in equids. The objectives of this study were to (a) compare the effect of different correction factors (CF) available in HRV analysis software on HRV indicator values and (b) to determine the repeatability and reliability of HRV indicators in an unrestricted (pasture) and a restricted movement (equine examination stocks) environment. Data were recorded on five consecutive days from six adult pony mares. Short term tachograms were compared with regards to software CF by graphical and statistical (Friedman’s and Wilcoxon signed rank test) comparison. The results showed that the specific CF influences the HRV indicator values. The Strong CF was able to balance the elimination of artefacts without removing the variability of RR-intervals and was subsequently used to determine repeatability and reliability. HRV indicators showed good repeatability over the 5 days using Friedman’s test (pasture: p=0.162-0.898; examination stocks: p=0.29-0.865), indicating that there were no significant differences between HRV indicator values. The reliability, represented by intraclass correlation coefficient (ICC) and coefficient of variation (CV), was poor to good for pasture data (ICC=0.44-0.79; CV=10-68.10) and examination stocks data (ICC=0.22-0.83; CV=16.07-62.29). Measurements obtained from the examination stocks were less reliable than those from pasture. Using normalized low-frequency and normalized high-frequency components improved reliability. Free-movement environment based HRV recordings could ensure better reliability, but may require the use of a stronger CF.en_ZA
dc.description.departmentAnatomy and Physiologyen_ZA
dc.description.departmentCompanion Animal Clinical Studiesen_ZA
dc.description.departmentSports Medicineen_ZA
dc.description.departmentStatisticsen_ZA
dc.description.embargo2017-11-30
dc.description.librarianhb2016en_ZA
dc.description.sponsorshipThe Department of Companion Animal Clinical Studies and the South African Veterinary Foundation.en_ZA
dc.description.urihttp://www.journals.elsevier.com/journal-of-equine-veterinary-science/en_ZA
dc.identifier.citationVan Vollenhoven, E, Grant, CC, Fletcher, L, Ganswindt, A & Page, PC 2016, 'Repeatability and reliability of heart rate variability in healthy, adult pony mares', Journal of Equine Veterinary Science, vol. 46, no. 1, pp. 73-81.en_ZA
dc.identifier.issn0737-0806
dc.identifier.other/10.1016/j.jevs.2016.07.006
dc.identifier.urihttp://hdl.handle.net/2263/57870
dc.language.isoenen_ZA
dc.publisherElsevieren_ZA
dc.rights© 2016 Elsevier Inc. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Journal of Equine Veterinary Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. A definitive version was subsequently published in Journal of Equine Veterinary Science, vol. 46, no. 1, pp. 73-81, 2016. doi : /10.1016/j.jevs.2016.07.006.en_ZA
dc.subjectHorse (Equus caballus)en_ZA
dc.subjectExamination stocksen_ZA
dc.subjectPastureen_ZA
dc.subjectStandardizationen_ZA
dc.subjectHeart rate variability (HRV)en_ZA
dc.subjectCorrection factors (CF)en_ZA
dc.subjectIntraclass correlation coefficient (ICC)en_ZA
dc.subjectCoefficient of variation (CV)en_ZA
dc.titleRepeatability and reliability of heart rate variability in healthy, adult pony maresen_ZA
dc.typePostprint Articleen_ZA

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