Assessing Resting Metabolic Rate in Overweight and Obese Adolescents With a Portable Indirect Calorimeter

Abstract

This pilot study found portable indirect calorimetry to be reliable and valid for assessing RMR in an overweight and obese adolescent population. In addition, this study indicates that portable indirect calorimetry may be an acceptable option for assessing RMR in this population compared with the traditional indirect calorimeter or predictive equations.

Low validity of predictive equations for calculating resting energy expenditure in overweight and obese women with polycystic ovary syndrome

“…Such equipment can reduce accuracy because the respiratory quotient may vary from 0.7 to 1.0. Yet validation tests demonstrate that it is possible to accurately assess the REE only by oxygen consumption (VO 2 ) (12,41) . Another limitation of the present study may be related to the patient's position during indirect calorimetry (sitting and holding the mouthpiece).…”

Comparison of Resting Energy Expenditure Assessment in Pediatric Oncology Patients

“…The RQ was used to test the metabolic cart validity, and the RQ from the metabolic cart for each patient was recorded and compared with the physiological range that exists in humans: 0.67–1.3 . Values measured outside this range were presumed to be an error in calibration, a leak in the system, or artifactual influence . These values were removed or “blocked out” of the final calculations.…”

“…32,33,41 Values measured outside this range were presumed to be an error in calibration, a leak in the system, or artifactual influence. 32,40,41 These values were removed or "blocked out" of the final calculations.…”

“…Since 2002, the portable hand‐held indirect calorimeter has been approved by the Food and Drug Administration and is lightweight, easily transported, less time consuming to use than the cart, can be administered by a registered dietitian nutritionist, and is cost‐efficient . Portable hand‐held indirect calorimetry has been validated in adults and healthy‐weight children, but has not been validated in chronically ill children, specifically children with cancer …”

“…34 Portable hand-held indirect calorimetry has been validated in adults and healthy-weight children, but has not been validated in chronically ill children, specifically children with cancer. [35][36][37][38][39][40] In clinical practice, pediatric oncology patients may be assessed with any of the described methods, with many registered dietitian nutritionists questioning their reliability in accurately assessing the patient's REE. Therefore, the purpose of this quality improvement (QI) project was to compare the accuracy of REE measurements taken by a portable hand-held indirect calorimeter and predictive equations with that of the standard metabolic cart indirect calorimeter in pediatric oncology patients.…”