Abstract
Indirect calorimetry is used to measure oxygen consumption for the purpose of accurately estimating resting metabolic rate (RMR). Laboratory devices are available for the measurement of RMR, such as the BodyGem® indirect calorimeter and the Vacumed VO2 Lab metabolic measuring system. Established prediction equations, such as the Mifflin-St. Jeor (MSJ), Harris-Benedict (HB), and Fleisch, can also be used to provide an estimate of RMR. PURPOSE: The purpose of this study was to compare the RMR of college-aged participants measured using a BodyGem® indirect calorimeter, a Vacumed VO2 Lab metabolic cart, and the aforementioned prediction equations. METHODS: Each participant (male = 15; female = 15; age = 22.7 + 3.3 yrs; wt = 77.5 + 14.5 kg; ht = 173.5 + 9.6 cm) completed a thirty-minute supine resting session in a quiet environment. Five minutes of resting data were then collected using the Vacumed while in the supine position. Immediately thereafter, five minutes of resting data was collected using the BodyGem® indirect calorimeter while in the seated position. The RMR values for the HB and Fleisch prediction equations were calculated using the proprietary software utilized by the Vacumed metabolic system, while the MSJ estimate of RMR was hand-calculated. RESULTS: A repeated measures ANOVA showed a significant difference among the measurement methods (BodyGem® = 1995.0 + 540.5 kcal; Vacumed = 1520.9 + 452.5 kcal; MSJ = 1669.3 + 242.9 kcal; HB = 1749.0 + 275.1 kcal; Fleisch = 1690.3 + 220.7 kcal) (p<.001). A post hoc paired samples t-test showed that the BodyGem® measured RMR significantly higher than the Vacumed, HB, Fleisch, and MSJ (p<.01). The HB estimation of RMR was greater than that of the Vacumed measurement (p<.025). For the equations, the RMR estimate of the Fleisch was higher than the MSJ (p<.025), while the HB was greater than both the Fleisch and the MSJ (p<.01). CONCLUSION: The Vacumed VO2 Lab metabolic cart measured RMR closer to the prediction equation estimates compared to the BodyGem® indirect calorimeter. Further research needs to be conducted comparing laboratory instruments to established prediction equations, on various populations, before the estimative methods can be deemed accurate for measuring RMR.
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