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Title: Simultaneous measurement of free-living energy expenditure by the doubly labeled water method and heart-rate monitoring

Total energy expenditure (TEE) was measured simultaneously in 14 free-living adults over 15 d by the doubly labeled water (DLW) method and for 2-4 separate days by heart-rate (HR) monitoring. Individual curves for HR vs oxygen consumption (VO2) were obtained and an HR (FLEX HR: 97 +/- 8 beats/min, range 84-113 beats/min) that discriminated between rest and activity was identified. Calibration curves were used to assign an energy value to daytime HR above FLEX HR. Below FLEX HR energy expenditure was taken as resting metabolism. Sleeping energy expenditure was assumed to be equal to basal metabolic rate. Average HR TEE (12.99 +/- 3.83 MJ/d) and average DLW TEE (12.89 +/- 3.80 MJ/d) were similar. HR TEE discrepancies ranged from -22.2% to +52.1%, with nine values lying within +/- 10% of DLW TEE estimates. The FLEX HR method provides a close estimation of the TEE of population groups. However, an increased number of sampling days may improve the precision of individual estimates of TEE.
Authors:
; ; ; ; ; ; ; ;  [1]
  1. (Univ. of Ulster at Jordanstown, County Antrim, Northern Ireland (England))
Publication Date:
OSTI Identifier:
6643038
Resource Type:
Journal Article
Resource Relation:
Journal Name: American Journal of Clinical Nutrition; (USA); Journal Volume: 52:1
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; MAN; METABOLISM; ADULTS; DEUTERIUM; DOUBLE LABELLING; EXERCISE; HEART; TRACER TECHNIQUES; WATER; AGE GROUPS; ANIMALS; BODY; CARDIOVASCULAR SYSTEM; HYDROGEN COMPOUNDS; HYDROGEN ISOTOPES; ISOTOPE APPLICATIONS; ISOTOPES; LABELLING; LIGHT NUCLEI; MAMMALS; NUCLEI; ODD-ODD NUCLEI; ORGANS; OXYGEN COMPOUNDS; PRIMATES; STABLE ISOTOPES; VERTEBRATES 550501* -- Metabolism-- Tracer Techniques