Title :
Steady State Condition in the Measurement of VO2and VCO2by Indirect Calorimetry
Author :
Cadena, M. ; Sacristan, E. ; Infante, O. ; Escalante, B. ; Rodriguez, F.
Author_Institution :
Dept. of Electr. Eng., Universidad Autonoma Metropolitana, Iztapalapa
fDate :
6/27/1905 12:00:00 AM
Abstract :
Resting metabolic rate (RMR) is computed using VO2 and VCO2 short time 15-minute window measurement with indirect calorimetry (IC) instruments designed with mixing chamber. Steady state condition using a 10% variation coefficient criteria is the main objective to achieve metabolic long time prediction reliability. This study address how susceptible is the steady state VO2, VCO 2 measurement condition to the clino-orthostatic physiological maneuver. 30 young healthy subjects were analyzed. Only 18 passed the 10% variation coefficient inclusive criteria. They were exposed to 10 minutes clino-stage and 10 minutes orthostage. The hypothesis tests show not statistical significance (ples0.1) in the average and variance analysis. It is concluded that the steady state is not influenced by the patient position IC test, probably because IC mixing chamber instruments are insensitive to detect a mayor physiological dynamics changes that can modify the steady state definition
Keywords :
biomedical equipment; biothermics; calorimetry; carbon compounds; gas sensors; oxygen; pneumodynamics; statistical analysis; 10 min; CO2; O2; indirect calorimetry; resting metabolic rate; steady state condition; variance analysis; Analysis of variance; Calorimetry; Cardiology; Current measurement; Electric variables measurement; Instruments; Integrated circuit testing; Steady-state; Time measurement; Voltage-controlled oscillators; Metabolic reliability; VO; calorimetry; metabolism;
Conference_Titel :
Engineering in Medicine and Biology Society, 2005. IEEE-EMBS 2005. 27th Annual International Conference of the
Conference_Location :
Shanghai
Print_ISBN :
0-7803-8741-4
DOI :
10.1109/IEMBS.2005.1616315
