Assessing the CPX Express Respiratory Gas Exchange System using Male Athletes

Author

Amy C. Keranen, St. Cloud State UniversityFollow

Date of Award

5-1998

Culminating Project Type

Thesis

Degree Name

Exercise Science: M.S.

Department

Kinesiology

College

School of Health and Human Services

First Advisor

David Bacharach

Second Advisor

Glenn Street

Third Advisor

Nancy Bacharach

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 License.

Keywords and Subject Headings

Exercise, CPX Express, respiratory gas exchange

Abstract

The purpose of this study was to determine the accuracy of the Medical Graphics CPX EXPRESS system at oxygen consumption's exceeding 4.25 L/min using the traditional Douglas bag method as a reference. Twelve male subjects ages 19-37 (±5.25) years participated in two exercise sessions. The sessions were identical consisting of a max treadmill test with increases in both speed and grade. Each stage was three minutes in length followed by two minutes of low intensity walking during which gas analysis for the stage could be completed for both the manual and CPX systems. All subjects completed at least four stages of the protocol. Repeated ANOVA's were run for the first three stages for V_E, VO₂ and VCO₂ with the p-value adjusted for number of ANOVA's performed (p=0.05/3=0.0167). There were no significant differences between the systems for mean V_E or VO₂ at any stage; however, mean VCO₂ was higher for stages 1 and 2 by 3.8% and 3.0%, respectively. The CPX EXPRESS had previously been determined to accurately measure low to moderate exercise intensities. This study was primarily concerned with stages yielding VO₂ values exceeding 4.25 L/min. Nine subjects completed stage 5 and four subjects completed stage 6. Separate MANOVA's were performed for stages 4, 5 and 6 using V_E VO₂ and VCO₂ as the dependent variables. There were no significant interactions nor main effects for system or test time at any of these last three stages where VO₂ averaged 4.34, 4.61, and 4.83 L/min, respectively. Results of this study suggest the CPX EXPRESS measures respiratory variables at higher intensities with acceptable accuracy.

Recommended Citation

Keranen, Amy C., "Assessing the CPX Express Respiratory Gas Exchange System using Male Athletes" (1998). Culminating Projects in Kinesiology. 33.
https://repository.stcloudstate.edu/pess_etds/33