Document Detail


Between-day and within-day variability in the relation between heart rate and oxygen consumption: effect on the estimation of energy expenditure by heart-rate monitoring.
MedLine Citation:
PMID:  9209164     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Estimation of energy expenditure (EE) by heart-rate (HR) monitoring (HRM) assumes that the relation between HR and oxygen consumption (VO2) is stable between days and within a day. To evaluate this assumption, 12 healthy subjects underwent an HR-VO2 calibration session on two mornings and two afternoons, with one morning and one afternoon session on the same day. Measurements were made while subjects were supine, sitting, standing while shifting body weight side-to-side, and walking at four intensities. Subjects wore an HR monitor during waking hours on another day (15.1 +/- 1.5 h). Regression analysis was used to determine the relation between HR and VO2 in the sedentary and active HR ranges, and four EE values (HRM-EE) based on the four calibration sessions were calculated for each subject. The four group mean HRM-EE values were nearly identical (CV: 1.1%). The regression equations generated from the four calibration sessions did not differ significantly for the group as a whole, but for some subjects there were significant differences among sessions in the slope of the active regression equation (P = 0.005). Intraindividual CVs for HRM-EE were generally < 10%, but ranged from 0.1% to 24.7%. In general, within an individual, HR was more variable than was VO2, and intraindividual variability in EE was associated with intraindividual variability in the flex HR and sedentary HR range. HRM is appropriate for assessment of EE for a group; however, caution is recommended when HRM is used for individual determinations of EE.
Authors:
M A McCrory; P A Molé; L A Nommsen-Rivers; K G Dewey
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Publication Detail:
Type:  Clinical Trial; Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The American journal of clinical nutrition     Volume:  66     ISSN:  0002-9165     ISO Abbreviation:  Am. J. Clin. Nutr.     Publication Date:  1997 Jul 
Date Detail:
Created Date:  1997-07-31     Completed Date:  1997-07-31     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0376027     Medline TA:  Am J Clin Nutr     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  18-25     Citation Subset:  AIM; IM    
Affiliation:
Department of Nutrition, University of California, Davis 95616-8669, USA.
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MeSH Terms
Descriptor/Qualifier:
Adult
Analysis of Variance
Basal Metabolism
Energy Metabolism*
Female
Heart Rate / physiology*
Humans
Male
Monitoring, Physiologic
Oxygen Consumption*
Posture
Reproducibility of Results
Grant Support
ID/Acronym/Agency:
HD-24112/HD/NICHD NIH HHS

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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