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A comparison of respiratory exchange variables between untrained, aerobically and anaerobically trained individuals

University of British Columbia

A Comparison of Respiratory Exchange Variables Among Untrained, Aerobically And Anaerobically Trained Individuals. The purpose of this study was to compare certain respiratory exchange variables among three solicted groups, namely aerobic (Ae), anaerobic (An), and untrained (Un) at their anaerobic threshold (AT), maximal aerobic and anaerobic capacities. Thirty college-aged males, ten per group, were tested on two different treadmill protocols to elicit the running velocity at the thresholds of anaerobic metabolism (Vtam), VO2 max and maximal anaerobic capacity from the Anaerobic Speed Test (AST). Significant differences among the three groups were found for: VO2 max. Ae: 65.8 > An: 59.6 > Un: 42.5 ml/kg-minute. Vtam Ae: 10.0 > An: 7.8 > Un: 6.1 miles/hour. VO2 at AT Ae: 49.2 > An: 41.3 > Un: 28.6 ml/kg-minute. Excess CO2 (ml/kg-min) elimination was used to determine the onset of anaerobiosis. No significant difference in excess CO2 elimination at VO2 max was evident in the three groups although the Un group demonstrated significantly higher values when compared to the An group at the AT (Un: 9.26 > An: 6.31 (Ae: 8.03) ml/kg-min). Significant differences were also demonstrated between the three groups for anaerobic capacity in the AST (An: 85.0 > Ae: 63.6 > Un: 39.5 seconds). The peak excess CO2 elimination values from the AST were higher for the An and Ae group when compared to the Un group (An: 35.6 & Ae: 32.8 > Un: 20.6 ml/kg-min). Findings in this study, related to differences in VO2 max, VO2 at AT, Vtam and anaerobic capacity (AST) are possibly attributable to the state of training of the three groups. Excess CO2 elimination as an indication of aerobic-anaerobic transition in energy metabolism may be useful in trained individuals but due to large variability in the excess CO2, the results from the untrained subjects were very difficult to interpret and further studies with excess CO2 in conjunction with end-tidal CO2 and lactate acid need be done.

Text

2010-03-29

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http://hdl.handle.net/2429/22829

Physical Education

University of British Columbia

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