A-34 Free Communication/Poster - Energy Expenditure: JUNE 1, 2011 7:30 AM - 12:30 PM: ROOM: Hall B
BACKGROUND: Measuring oxygen consumption and carbon dioxide production during exercise is a standard measurement in exercise sciences. There is no information about the differences between different breath by breath systems (BxB) from the same manufacturer.
PURPOSE: To test the variation between and within three Oxycon Pro (Jaeger, Viasys Healthcare, Germany) online gas analysis systems.
METHODS: 4 healthy physically active male subjects (Age 24±1y, weight 72.73±8.78kg, and height 1.81±0.05m) were recruited. All subjects visited the human performance lab 3 times, one week apart. Following a 24 hour replicated diet and an overnight fast subjects cycled for 15 minutes at 3 work intensities: 100W, 150W and 200W, totalling 45 minutes per trial. VE, VO2, VCO2 and RER were measured at each workload using the 3 BxB. Following 5 minutes of steady state exercise at each workload measurements were obtained for 5 minutes. A three-way splitter was used in order to directly compare 3 BxB simultaneously.
RESULTS: At 200W, VO2 was 3.06 ± 0.10, 3.06 ± 0.11 and 2.99 ± 0.09 L/min and VCO2 was 2.83 ± 0.15, 2.77 ± 0.17 and 2.87 ± 0.11 L/min for BxB1, 2 and 3 respectively. Small non-significant variations were observed between the 3 BxB at all intensities for measures of VE, VO2, VCO2, and RER. The between BxB variation was similar to within BxB variation (See Table 1).
CONCLUSIONS: The study shows that BxB systems from the same manufacturer provide similar results and the reliability of these systems is good.