title: Comparison of energy expenditure by the doubly labeled water technique with energy intake, heart rate, and activity recording in man.
abstract: Average daily energy expenditure determined by the doubly labeled water technique (dlwEE) was compared in six subjects (aged 20-30 y) over 2 wk under usual living conditions; average food energy intake and energy expenditure estimated from individual diary records of physical activity. In addition, energy expenditure was estimated from 24-h heart rate recordings carried out on two randomly chosen days of the 2-wk period. The group means of the dlwEE were 1.94 +/- 0.24 (means +/- SD) times larger than resting metabolic rate (= 1.94 met) and nearly identical to the average daily energy intake (1.93 +/- 0.23 met). Energy expenditure estimated from the diaries of activity and from the 24-h heart rate recording varied between 1.67 and 2.24 met depending on the calculation procedure. The dlwEE (1.94 +/- 0.24 met) is much higher than that recently determined for sedentary people (1.25 met) and thus explains that young students may achieve body weight balance with a relatively high daily food energy intake.
authors.affiliation: Department of Physiology, Justus Liebig University, Giessen, FRG.
authors.forename: S
authors.initials: S
authors.lastname: Schulz
authors.forename: K R
authors.initials: KR
authors.lastname: Westerterp
authors.forename: K
authors.initials: K
authors.lastname: Brück
mesh_terms: D000328:Adult; D001481:Basal Metabolism; D001827:Body Height; D001835:Body Weight; D003903:Deuterium; D002149:Energy Intake; D004734:Energy Metabolism; D005260:Female; D006339:Heart Rate; D006801:Humans; D008297:Male; D010103:Oxygen Isotopes; D005082:Physical Exertion; D012885:Skinfold Thickness
chemical_list: D010103:Oxygen Isotopes; D003903:Deuterium