Determinants of 24-hour energy expenditure in man. Methods and results using a respiratory chamber.

Ravussin, Éric; Lillioja, Stephen; Anderson, Thomas E.; Christin, Laurent; Bogardus, Clifton

doi:10.1172/jci112749

Cited by 1,031 publications

(727 citation statements)

References 27 publications

Supporting

Mentioning

673

Contrasting

Unclassified

Order By: Relevance

“…The FAO/WHO/UNU (1985) equations only consider body weight, age and gender to predict BMR and exclude other important factors, such as body composition. In this regard, the significant difference between EBMR and MBMR in sedentary people can likely be explained by the heterogeneity in body composition (Ravussin et al, 1986;Klausen et al, 1997).…”

Section: Discussionmentioning

confidence: 99%

Estimation of daily energy needs with the FAO/WHO/UNU 1985 procedures in adults: comparison to whole-body indirect calorimetry measurements

et al. 2004

View full text Add to dashboard Cite

Objectives: To measure daily energy expenditure (DEE) with indirect calorimetric facilities in sedentary and active subjects. To estimate daily energy needs with the FAO/WHO/UNU (1985) procedures (EDEE) and estimated energy requirement (EER) with the dietary reference intakes 2002 (DRI) in healthy adults with sedentary or high-activity conditions. To compare estimated daily energy needs with their measured values. Design: Two groups of healthy subjects were tested under sedentary or high-activity conditions. In both groups, resting energy expenditure was measured after a 12-h overnight fast. DEE and basal metabolic rate (BMR) values were also measured with indirect calorimetry and compared to the relevant predicted values. Physical activity level and BMR were also estimated. Subjects: A total of 45 sedentary (26 men and 19 women) and 69 active subjects (43 men and 26 women) aged 18-30 and 30-60 y. Results: Measured daily energy expenditure (MDEE) was significantly lower than EDEE in sedentary men and women and in active men for the two age groups considered (Po0.05). EER was significantly lower than EDEE in both sedentary and active subjects of each subgroup (Po0.05).

show abstract

Section: Discussionmentioning

confidence: 99%

Estimation of daily energy needs with the FAO/WHO/UNU 1985 procedures in adults: comparison to whole-body indirect calorimetry measurements

et al. 2004

View full text Add to dashboard Cite

show abstract

“…When regression models are used, the contribution of fat mass appears to be around 0.15-0.2 of the contribution of the same mass of lean tissue. 24,25 Studies in humans show that in this species as well, fat mass makes a contribution to EE that is a 0.15-0.2, 5,26,27 or a greater 28 proportion of that of the equivalent lean mass.…”

Section: Comparison Of Energy Expenditure In Lean and Obese Animalsmentioning

confidence: 94%

“…The latter might be obtained from a sophisticated curve-fitting programme, or it may be roughly determined from Dx/Ddt for times either side of the time for which EE is being calculated. 5 In many set-ups for rodents, x is measured only once every 10-15 min, which makes accurate determination of dx/dt difficult. For really accurate measurement of EE, a continuous measurement of x is the best approach.…”

Section: 'Instant' Measurementsmentioning

confidence: 99%

“…For really accurate measurement of EE, a continuous measurement of x is the best approach. Ravussin et al 5 describe such a system for calorimetry in humans, and measure Dx over 2 min periods. The term C dx/dt in equations (12) and (13) is based on the assumption that the rate of change of x in air leaving the chamber is the same as that for air inside the chamber.…”

Section: 'Instant' Measurementsmentioning

confidence: 99%

“…There are some excellent articles that provide such information [1][2][3][4][5][6] and there would be little point in repeating them. There does, however, appear to be a need for an article that introduces those who work with animal models of obesity, and perhaps others, to the mathematics of indirect calorimetry and the limitations of its interpretation.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Some mathematical and technical issues in the measurement and interpretation of open-circuit indirect calorimetry in small animals

et al. 2006

View full text Add to dashboard Cite

Indirect calorimetry is increasingly used to investigate why compounds or genetic manipulations affect body weight or composition in small animals. This review introduces the principles of indirect (primarily open-circuit) calorimetry and explains some common misunderstandings. It is not widely understood that in open-circuit systems in which carbon dioxide (CO 2 ) is not removed from the air leaving the respiratory chamber, measurement of airflow out of the chamber and its oxygen (O 2 ) content paradoxically allows a more reliable estimate of energy expenditure (EE) than of O 2 consumption. If the CO 2 content of the exiting air is also measured, both O 2 consumption and CO 2 production, and hence respiratory quotient (RQ), can be calculated. Respiratory quotient coupled with nitrogen excretion allows the calculation of the relative combustion of the macronutrients only if measurements are over a period where interconversions of macronutrients that alter their pool sizes can be ignored. Changes in rates of O 2 consumption and CO 2 production are not instantly reflected in changes in the concentrations of O 2 and CO 2 in the air leaving the respiratory chamber. Consequently, unless air-flow is high and chamber size is small, or rates of change of O 2 and CO 2 concentrations are included in the calculations, maxima and minima are underestimated and will appear later than their real times. It is widely appreciated that bigger animals with more body tissue will expend more energy than smaller animals. A major issue is how to compare animals correcting for such differences in body size. Comparison of the EE or O 2 consumption per gram body weight of lean and obese animals is misleading because tissues vary in their energy requirements or in how they influence EE in other ways. Moreover, the contribution of fat to EE is lower than that of lean tissue. Use of metabolic mass for normalisation, based on interspecific scaling exponents (0.75 or 0.66), is similarly flawed. It is best to use analysis of covariance to determine the relationship of EE to body mass or fat-free mass within each group, and then test whether this relationship differs between groups.

show abstract

Consequences of Incomplete Carbohydrate Absorption From Fruit Juice Consumption in Infants

Cole

Rising²,

Lifshitz³

1999

Arch Pediatr Adolesc Med

View full text Add to dashboard Cite

Background: Most infants consume fruit juices by 6 months of age. However, fruit juices containing sorbitol may be associated with carbohydrate malabsorption without clinical symptoms. We hypothesized that increased physical activity and metabolic rate may be associated with carbohydrate malabsorption. Methods: Physical activity and metabolic rate were determined in 14 healthy infants ([mean ± SD] age, 5.1 ± 0.8 months; weight, 7.8 ± 1.1 kg; length, 67 ± 4.2 cm; and body fat, 26% ± 5%) for 3 hours in a respiratory chamber. Seven were fed pear juice, and the other 7 were fed white grape juice (120 mL) after a 2-hour fast. Pear juice contains sorbitol and a high fructose-glucose ratio, whereas white grape juice is sorbitol free and has a low fructoseglucose ratio. Carbohydrate absorption was determined by breath hydrogen gas analysis. The study was doubleblinded. Results: When compared with the infants without car-Editor's Note: So why do so many kids drink apple juice? Or is it only my imagination?

show abstract

Determinants of 24-hour energy expenditure in man. Methods and results using a respiratory chamber.

Cited by 1,031 publications

References 27 publications

Estimation of daily energy needs with the FAO/WHO/UNU 1985 procedures in adults: comparison to whole-body indirect calorimetry measurements

Estimation of daily energy needs with the FAO/WHO/UNU 1985 procedures in adults: comparison to whole-body indirect calorimetry measurements

Some mathematical and technical issues in the measurement and interpretation of open-circuit indirect calorimetry in small animals

Consequences of Incomplete Carbohydrate Absorption From Fruit Juice Consumption in Infants

Contact Info

Product

Resources

About