A comparison between heart rate and heart rate variability as indicators of cardiac health and fitness

dc.contributor.authorGrant, C.C. (Catharina Cornelia)
dc.contributor.authorMurray, C.
dc.contributor.authorJanse van Rensburg, Dina Christina
dc.contributor.authorFletcher, Lizelle
dc.contributor.emailrina.grant@up.ac.zaen_US
dc.date.accessioned2014-02-03T11:45:17Z
dc.date.available2014-02-03T11:45:17Z
dc.date.issued2013
dc.description.abstractQuantification of cardiac autonomic activity and control via heart rate (HR) and heart rate variability (HRV) is known to provide prognostic information in clinical populations. Issues with regard to standardisation and interpretation of HRV data make the use of the more easily accessible HR on its own as an indicator of autonomic cardiac control very appealing. The aim of this study was to investigate the strength of associations between an important cardio vascular health metric such as VO2max and the following: HR, HRV indicators and normalised HRV indicators (divided by mean RR interval). A cross sectional descriptive study was done including 145 healthy volunteers aged between 18 and 22 years. HRV was quantified by time domain, frequency domain and Poincaré plot analysis. Indirect VO2max was determined using the Multistage Coopers test. The Pearson correlation coefficient was calculated to quantify the strength of the associations. Both simple linear and multiple stepwise regressions were performed to be able to discriminate between the role of the individual indicators as well as their combined association with VO2max. Only HR, RR interval and pNN50 showed significant (p<0.01, p<0.01 and p=0.03) correlations with VO2max. Stepwise multiple regression indicated that, when combining all HRV indicators the most important predictor of cardio vascular fitness as represented by VO2max, is HR. HR explains 17% of the variation, while the inclusion of HF (high frequency HRV indicator) added only an additional 3.1% to the coefficient of determination. Results also showed when testing the normalised indicators, HR explained of the largest percentage of the changes in VO2max (16.5%). Thus HR on its own is the most important predictor of changes in an important cardiac health metric such as VO2max. These results may indicate that during investigation of exercise ability (VO2max) phenomena, quantification of HRV may not add significant value.en_US
dc.description.librarianhb2014en_US
dc.description.librarianay2014
dc.description.urihttp://www.frontiersin.org/Physiologyen_US
dc.identifier.citationGrant, CC, Murray, C, Janse van Rensburg, DC & Fletcher, L 2013, 'A comparison between heart rate and heart rate variability as indicators of cardiac health and fitness', Frontiers in Physiology, vol. 4, art. 337, pp. 1-5.en_US
dc.identifier.issn1664-042X (online)
dc.identifier.urihttp://hdl.handle.net/2263/33226
dc.language.isoenen_US
dc.publisherFrontiers Research Foundationen_US
dc.rights© 2013 Authors. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.en_US
dc.subjectAutonomic cardiac controlen_US
dc.subjectPrognostic indicatorsen_US
dc.subjectExercise abilityen_US
dc.subject.lcshHeart rate monitoringen
dc.subject.lcshHeart function testsen
dc.titleA comparison between heart rate and heart rate variability as indicators of cardiac health and fitnessen_US
dc.typeArticleen_US

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