Ratio of Total Carbon Dioxide produced to Oxygen consumed is predictive of VO 2 max during Graded Exercise Testing

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Ratio of Total Carbon Dioxide produced to Oxygen consumed is predictive of VO 2 max during Graded Exercise Testing

Journal Title: Biology of Exercise - Year 2016, Vol 12, Issue 2

Abstract

The purpose of the present investigation was to examine the ratio between total cO 2expiration and O2 consumption to vO2max. Twenty-six male (vO2 max: 55.4Â± 8.3 ml O2/kg*min) and thirtyfive female (vO2 max: 44.1Â± 8.1 ml O2/kg*min) recreationally active adults volunteered. The participants underwent a custom ramped treadmill protocol (gXT) with expired gases monitored. Third order polynomial regression was undertaken for the vO 2 and vcO2 by time (r>0.950). regression equations were integrated from 60seconds after the start of the test (to negate any initial hyperventilation) until vO2 max. This area under the curve calculation was equal to the total accumulated expired cO 2 and consumed O2. The ratio of total cO2 to O2 was calculated (auc ratio). Data analysis was undertaken using multiple linear regression analysis. The model included gender, rer at vO 2 max and auc ratio as predictors and relative vO2 max as the outcome. The model was significant with predictor variable gender (b =0.582, p<0.001) and auc ratio (b=-0.298, p=0.019) significant in the model. Based upon these results it would appear that individuals who are more fit relying more heavily on oxidative pathways throughout the course of a gXT.

Authors and Affiliations

DavID Bellar| School of Kinesiology, University of Louisiana-Lafayette, Lafayette, LA 70506, lawrence w. JuDge| School of Kinesiology, Sport & Exercise Science, Ball State University, Muncie, IN 47306

Keywords

EP ID EP15887
DOI http: doi.org/10.4127/jbe.2016.0108
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