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Article Title

COMPARISON OF OXYGEN UPTAKE VALUES DURING TREADMILL EXERCISE AT 70% OF ESTIMATED MAXIMAL OXYGEN UPTAKE BETWEEN FACEMASK AND MOUTHPIECE GAS COLLECTION METHODS

Authors

L Dobler
S Dirks

Abstract

L. Dobler & S. Dirks
Gustavus Adolphus College, St. Peter, MN

The highest oxygen uptake (VO2) max (an astounding 93 to 95 ml/kg/min) ever recorded is that of Bjorn Daehlie, a cross-country skier from Norway (Karp 2014). Maximal oxygen uptake is considered to the best predictor of cardiorespiratory capacity (Munsey et al., 2010). Many methods are used to determine or measure VO2max. There is more volume space for expired gases in the facemask (FM), while the mouthpiece (MP) has a less obstructed and a more straight-line for expired volumes. Does the extra space in the FM increase carbon dioxide (CO2) levels before it is sampled by the analyzer, and does this difference influence expired gas measures of oxygen and CO2? The purpose of this study is to compare differences VO2 values between FM and MP gas collection methods during submaximal exercise. Ten active collegiate students are participating in this study. A one-sample experimental design is comparing differences in VO2 between FM and MP collecting methods. Maximal VO2 is being estimated using the submaximal modified Balke-Ware treadmill protocol. The experimental treadmill trials consist of 70% of the subject’s VO2 max. The speed is set at 5.0 mph (143 m/min) and the percent incline is being calculated using the equation provided by the American College of Sports Medicine (2014). The sequence of FM and MP conditions are randomized, and experimental sessions are being performed on separate days with at least one day between tests. A Medical Graphic VO2000 portable gas analyzer is collecting gases and calculation VO2 values. A paired t-test is analyzing significant differences (p <0.05) in VO2 values between the FM and MP trials. A survey is being used to gather the subjects’ perceptions of exertion and feelings of breathing. This survey is being used to help discuss results. Expected results may indicate the trials using the mouthpiece will have higher VO2 values than the trials using the facemask. This survey is being used to help discuss results. Expected results may indicate the trials using the mouthpiece will have higher VO2 values than the trials using the facemask. The survey responses may indicate that the facemask is preferable because the subjects do not need to bite down on a mouthpiece; however, the subjects may prefer the mouthpiece because it may have a greater feeling of free breathing than the facemask. Based on these expected results, mouthpiece use may have a better reflection of true VO2 due to less obstructive air flow or higher concentrations of carbon dioxide left in the facemask spaces. Data collection is in progress and will be completed by mid March. IRB approval # 1415-0057

NACSM Professional Sponsor: Bruce Van Duser

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