Validation of the BodyGem™ hand-held calorimeter

Abstract

OBJECTIVE:To assess the validity and reliability of a hand-held indirect calorimeter. DESIGN: Resting metabolic rate (RMR) was measured on two separate mornings. SUBJECTS: A heterogeneous sample of 41 healthy adults. MEASUREMENTS: RMR using both a metabolic cart (Sensormedics 2900, SM-2900) and a hand-held indirect calorimeter (BodyGemt, BG). RESULTS: There were no trial-to-trial differences in RMR measured by the BG (67567163 vs 66977163 kJ/day) or the SM-2900 (64007163 vs 63967167 kJ/day). RMR measured by the BG was significantly higher than that measured by the SM-2900 during both trials. In a sample of 10 subjects, the energy cost of holding the BG in position was determined to be (0.1770.04 kJ/ min, or 255784 kJ/day). After applying this adjustment, the differences between systems were no longer significant during trial 1 (mean difference ¼ 101767 kJ/day) or trial 2 (46775 kJ/day). In overweight and obese individuals, RMR measured by the BodyGemt was more accurate than that estimated by the Harris-Benedict equations. CONCLUSION: The BodyGemt provides valid and reliable measurements of RMR. The BodyGemt produces significantly higher values than the Sensor Medics 2900 indirect calorimeter, with the increase largely due to an increased energy demand required to hold the BG in position.

A Systematic Review on Use of a Handheld Indirect Calorimeter to Assess Energy Needs in Adults and Children

“…Melanson et al (20) The results of Compher et al (6) widened the mean RMR difference between the Gem and reference system from -10.2% to -15.1%. Because of this adjustment, the Gem device did not perform comparably to the reference system.…”

“…Results from the search yielded 12 published studies: 8 on the MedGem (1, 6, 9, 14, 22, 27, 30, 31), 3 on the BodyGem (18,20,23), and 1 on the HealtheTech (28). Next, a search was conducted for abstract presentations for the MedGem and BodyGem device.…”

Increased meal frequency attenuates fat-free mass losses and some markers of health status with a portion-controlled weight loss diet

“…12 rested in a seated quiet room for 5-10 minutes prior to measurement. This system has been validated against a metabolic cart in healthy normal weight individuals and higher accuracy than using Harris-Benedict prediction equations for RMR [18]. Participants were seated in a quiet room and had not participated in any strenuous exercise for at least 24-hours prior to measurement.…”

Long-term effects of increased dietary polyunsaturated fat from walnuts on metabolic parameters in type II diabetes

“…Resting energy expenditure was measured using the BodyGem handheld indirect calorimeter (model 200-0001-01; HealtheTech, Golden, CO, USA), validated against other techniques (Melanson et al, 2004;Compher et al, 2005;Rubenbauer et al, 2006). Fasted blood samples were drawn by trained professionals and sent to a quality-assured pathology laboratory (Southern IML Pathology, Wollongong, Australia).…”