Abstract

Background & aims: The assessment of metabolic parameters related to energy expenditure has a proven value for weight management; however these measurements remain too difficult and costly for monitoring individuals at home. The objective of this study is to evaluate the accuracy of a new pocket-sized metabolic analyzer device for assessing energy expenditure at rest (REE) and during sedentary activities (EE). The new device performs indirect calorimetry by measuring an individual's oxygen consumption (VO2) and carbon dioxide production (VCO2) rates, which allows the determination of resting- and sedentary activity-related energy expenditure. Methods: VO2 and VCO2 values of 17 volunteer adult subjects were measured during resting and sedentary activities in order to compare the metabolic analyzer with the Douglas bag method. The Douglas bag method is considered the Gold Standard method for indirect calorimetry. Metabolic parameters of VO2, VCO2, and energy expenditure were compared using linear regression analysis, paired t-tests, and Bland-Altman plots. Results: Linear regression analysis of measured VO2 and VCO2 values, as well as calculated energy expenditure assessed with the new analyzer and Douglas bag method, had the following linear regression parameters (linear regression slope LRS0, and R-squared coefficient, r2) with p = 0: LRS0 (SD) = 1.00 (0.01), r2 = 0.9933 for VO2; LRS0 (SD) = 1.00 (0.01), r2 = 0.9929 for VCO2; and LRS0 (SD) = 1.00 (0.01), r2 = 0.9942 for energy expenditure. In addition, results from paired t-tests did not show statistical significant difference between the methods with a significance level of α = 0.05 for VO2, VCO2, REE, and EE. Furthermore, the Bland-Altman plot for REE showed good agreement between methods with 100% of the results within ±2SD, which was equivalent to ≤10% error. Conclusion: The findings demonstrate that the new pocket-sized metabolic analyzer device is accurate for determining VO2, VCO2, and energy expenditure.

Original languageEnglish (US)
Pages (from-to)341-347
Number of pages7
JournalClinical Nutrition
Volume33
Issue number2
DOIs
StatePublished - 2014

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Energy Metabolism
Linear Models
Indirect Calorimetry
Equipment and Supplies
Regression Analysis
Carbon Dioxide
Oxygen Consumption
Volunteers
Weights and Measures

Keywords

  • Carbon dioxide production
  • Fitness
  • Indirect calorimetry
  • Oxygen consumption
  • Resting energy expenditure
  • Weight management

ASJC Scopus subject areas

  • Critical Care and Intensive Care Medicine
  • Nutrition and Dietetics

Cite this

A pocket-sized metabolic analyzer for assessment of resting energy expenditure. / Zhao, Di; Xian, Xiaojun; Terrera, Mirna; Krishnan, Ranganath; Miller, Dylan; Bridgeman, Devon; Tao, Kevin; Zhang, Lihua; Tsow, Francis; Forzani, Erica; Tao, Nongjian.

In: Clinical Nutrition, Vol. 33, No. 2, 2014, p. 341-347.

Research output: Contribution to journalArticle

Zhao, D, Xian, X, Terrera, M, Krishnan, R, Miller, D, Bridgeman, D, Tao, K, Zhang, L, Tsow, F, Forzani, E & Tao, N 2014, 'A pocket-sized metabolic analyzer for assessment of resting energy expenditure', Clinical Nutrition, vol. 33, no. 2, pp. 341-347. https://doi.org/10.1016/j.clnu.2013.06.001
Zhao, Di ; Xian, Xiaojun ; Terrera, Mirna ; Krishnan, Ranganath ; Miller, Dylan ; Bridgeman, Devon ; Tao, Kevin ; Zhang, Lihua ; Tsow, Francis ; Forzani, Erica ; Tao, Nongjian. / A pocket-sized metabolic analyzer for assessment of resting energy expenditure. In: Clinical Nutrition. 2014 ; Vol. 33, No. 2. pp. 341-347.
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abstract = "Background & aims: The assessment of metabolic parameters related to energy expenditure has a proven value for weight management; however these measurements remain too difficult and costly for monitoring individuals at home. The objective of this study is to evaluate the accuracy of a new pocket-sized metabolic analyzer device for assessing energy expenditure at rest (REE) and during sedentary activities (EE). The new device performs indirect calorimetry by measuring an individual's oxygen consumption (VO2) and carbon dioxide production (VCO2) rates, which allows the determination of resting- and sedentary activity-related energy expenditure. Methods: VO2 and VCO2 values of 17 volunteer adult subjects were measured during resting and sedentary activities in order to compare the metabolic analyzer with the Douglas bag method. The Douglas bag method is considered the Gold Standard method for indirect calorimetry. Metabolic parameters of VO2, VCO2, and energy expenditure were compared using linear regression analysis, paired t-tests, and Bland-Altman plots. Results: Linear regression analysis of measured VO2 and VCO2 values, as well as calculated energy expenditure assessed with the new analyzer and Douglas bag method, had the following linear regression parameters (linear regression slope LRS0, and R-squared coefficient, r2) with p = 0: LRS0 (SD) = 1.00 (0.01), r2 = 0.9933 for VO2; LRS0 (SD) = 1.00 (0.01), r2 = 0.9929 for VCO2; and LRS0 (SD) = 1.00 (0.01), r2 = 0.9942 for energy expenditure. In addition, results from paired t-tests did not show statistical significant difference between the methods with a significance level of α = 0.05 for VO2, VCO2, REE, and EE. Furthermore, the Bland-Altman plot for REE showed good agreement between methods with 100{\%} of the results within ±2SD, which was equivalent to ≤10{\%} error. Conclusion: The findings demonstrate that the new pocket-sized metabolic analyzer device is accurate for determining VO2, VCO2, and energy expenditure.",
keywords = "Carbon dioxide production, Fitness, Indirect calorimetry, Oxygen consumption, Resting energy expenditure, Weight management",
author = "Di Zhao and Xiaojun Xian and Mirna Terrera and Ranganath Krishnan and Dylan Miller and Devon Bridgeman and Kevin Tao and Lihua Zhang and Francis Tsow and Erica Forzani and Nongjian Tao",
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T1 - A pocket-sized metabolic analyzer for assessment of resting energy expenditure

AU - Zhao, Di

AU - Xian, Xiaojun

AU - Terrera, Mirna

AU - Krishnan, Ranganath

AU - Miller, Dylan

AU - Bridgeman, Devon

AU - Tao, Kevin

AU - Zhang, Lihua

AU - Tsow, Francis

AU - Forzani, Erica

AU - Tao, Nongjian

PY - 2014

Y1 - 2014

N2 - Background & aims: The assessment of metabolic parameters related to energy expenditure has a proven value for weight management; however these measurements remain too difficult and costly for monitoring individuals at home. The objective of this study is to evaluate the accuracy of a new pocket-sized metabolic analyzer device for assessing energy expenditure at rest (REE) and during sedentary activities (EE). The new device performs indirect calorimetry by measuring an individual's oxygen consumption (VO2) and carbon dioxide production (VCO2) rates, which allows the determination of resting- and sedentary activity-related energy expenditure. Methods: VO2 and VCO2 values of 17 volunteer adult subjects were measured during resting and sedentary activities in order to compare the metabolic analyzer with the Douglas bag method. The Douglas bag method is considered the Gold Standard method for indirect calorimetry. Metabolic parameters of VO2, VCO2, and energy expenditure were compared using linear regression analysis, paired t-tests, and Bland-Altman plots. Results: Linear regression analysis of measured VO2 and VCO2 values, as well as calculated energy expenditure assessed with the new analyzer and Douglas bag method, had the following linear regression parameters (linear regression slope LRS0, and R-squared coefficient, r2) with p = 0: LRS0 (SD) = 1.00 (0.01), r2 = 0.9933 for VO2; LRS0 (SD) = 1.00 (0.01), r2 = 0.9929 for VCO2; and LRS0 (SD) = 1.00 (0.01), r2 = 0.9942 for energy expenditure. In addition, results from paired t-tests did not show statistical significant difference between the methods with a significance level of α = 0.05 for VO2, VCO2, REE, and EE. Furthermore, the Bland-Altman plot for REE showed good agreement between methods with 100% of the results within ±2SD, which was equivalent to ≤10% error. Conclusion: The findings demonstrate that the new pocket-sized metabolic analyzer device is accurate for determining VO2, VCO2, and energy expenditure.

AB - Background & aims: The assessment of metabolic parameters related to energy expenditure has a proven value for weight management; however these measurements remain too difficult and costly for monitoring individuals at home. The objective of this study is to evaluate the accuracy of a new pocket-sized metabolic analyzer device for assessing energy expenditure at rest (REE) and during sedentary activities (EE). The new device performs indirect calorimetry by measuring an individual's oxygen consumption (VO2) and carbon dioxide production (VCO2) rates, which allows the determination of resting- and sedentary activity-related energy expenditure. Methods: VO2 and VCO2 values of 17 volunteer adult subjects were measured during resting and sedentary activities in order to compare the metabolic analyzer with the Douglas bag method. The Douglas bag method is considered the Gold Standard method for indirect calorimetry. Metabolic parameters of VO2, VCO2, and energy expenditure were compared using linear regression analysis, paired t-tests, and Bland-Altman plots. Results: Linear regression analysis of measured VO2 and VCO2 values, as well as calculated energy expenditure assessed with the new analyzer and Douglas bag method, had the following linear regression parameters (linear regression slope LRS0, and R-squared coefficient, r2) with p = 0: LRS0 (SD) = 1.00 (0.01), r2 = 0.9933 for VO2; LRS0 (SD) = 1.00 (0.01), r2 = 0.9929 for VCO2; and LRS0 (SD) = 1.00 (0.01), r2 = 0.9942 for energy expenditure. In addition, results from paired t-tests did not show statistical significant difference between the methods with a significance level of α = 0.05 for VO2, VCO2, REE, and EE. Furthermore, the Bland-Altman plot for REE showed good agreement between methods with 100% of the results within ±2SD, which was equivalent to ≤10% error. Conclusion: The findings demonstrate that the new pocket-sized metabolic analyzer device is accurate for determining VO2, VCO2, and energy expenditure.

KW - Carbon dioxide production

KW - Fitness

KW - Indirect calorimetry

KW - Oxygen consumption

KW - Resting energy expenditure

KW - Weight management

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