A New Whole Room Indirect Calorimeter for Measurement of the Energetics of Exercise.
The purpose of this study was to compare the accuracy of exercise energy expenditure (EXEE) measurements from a metabolic cart (HG_MC) to that obtained with a new exercise whole room indirect calorimeter (EX_WRIC). First, the HG_MC and the EX_WRIC were subjected to 10, 30-min ethanol (99.8% purity) and propane (99.5% purity) combustion validations, respectively, for EE, ventilation rates (liters) of oxygen (VO2), carbon dioxide (VCO2), and the respiratory quotient (RQ; VCO2/VO2). Then, 15 healthy adults (13 men and 2 women) cycled at 65% age predicted heart rate max for random determination of their EXEE, VO2, VCO2and RQ after a 12-hr fast with both the HG-MC and EX_WRIC. Comparing stoichiometry to combustion, the HG_MC underestimated EE (P<0.05), VO2(P<0.05), VCO2(P<0.05), and RQ (P<0.05) while no differences were found for the EX_WRIC. The EXEE and VO2were lower (P<0.05) while RQ was greater (P<0.05) when measured with the HG_MC versus the EX_WRIC. The EX_WRIC was more accurate than the HG_MC without the related tethered connections.
Columbia University Medical Center, Department of Medicine, Columbia University, New York, NY.
Russell
R
Rising
Flick Hospitality Group, Rye Brook, NY.
Kathryn
K
Whyte
Icahn School of Medicine at Mount Sinai, New York, NY.
Jeanine
J
Albu
Columbia University Medical Center, Department of Medicine, Columbia University, New York, NY.
Xavier
X
Pi-Sunyer
Energy Expenditure; Head Gear; Metabolic Cart