NDLI: The test-retest reliability of gas exchange kinetics in humans using a pseudo random binary sequence exercise test

Content Provider	Springer Nature Link
Author	Edwards, A. Challis, N. Chapman, J. Claxton, D. Fysh, M.
Copyright Year	2001
Abstract	The purpose of this study was to compare the test-retest reliability of oxygen uptake ( $$\dot V{\rm O}_{\rm 2} $$ ) kinetics with carbon dioxide output( $$\dot V{\rm CO}_{\rm 2} $$ ) kinetics using a pseudo random binary sequence (PRBS) exercise test. A reliable test of gas exchange kinetics would have the potential of being applied as a sports fitness test. Ten healthy male subjects agreed to participate in the study and all subjects completed two identical PRBS exercise tests (test 1 and test 2), separated by a 30 min period of inactivity. Three consecutive 300 s PRBS cycles were completed in each test with 20 s exercise intensity changes between 25 and 85 W using an electrically braked cycle ergometer. Fourier analysis was computed for frequencies 3.3, 6.7 and 10 mHz. Statistical analysis by two-way ANOVA with repeated measures did not reveal significant differences between test 1 and test 2 for either $$\dot V{\rm O}_{\rm 2} $$ kinetics or $$\dot V{\rm CO}_{\rm 2} $$ kinetics. Static gain of $$\dot V{\rm O}_{\rm 2} $$ for test 1 [9.11 (SD 0.59) ml·min–1·W–1] and test 2 [9.23 (SD 0.64) ml·min–1·W–1] did not differ significantly between tests. The 95% limits of agreement for $$\dot V{\rm CO}_{\rm 2} $$ kinetics displayed increased variability in comparison to $$\dot V{\rm O}_{\rm 2} $$ kinetics at each frequency of amplitude ratio and phase shift. Systematic bias ranged between 0% and 4%, except at frequency 10 mHz of $$\dot V{\rm CO}_{\rm 2} $$ kinetics phase shift which showed a 10% bias for slower $$\dot V{\rm O}_{\rm 2} $$ kinetics in test 2. It is possible that the increased variability of $$\dot V{\rm CO}_{\rm 2} $$ kinetics compared to $$\dot V{\rm O}_{\rm 2} $$ kinetics might be attributable to a lower signal to noise ratio in $$\dot V{\rm CO}_{\rm 2} $$ kinetics, variations in ventilation or the storage mechanisms of CO2. The lower variability of $$\dot V{\rm O}_{\rm 2} $$ kinetics compared with $$\dot V{\rm CO}_{\rm 2} $$ kinetics suggests that the PRBS test of $$\dot V{\rm O}_{\rm 2} $$ kinetics has the greater potential for further development as an indicator of aerobic fitness.
Starting Page	333
Ending Page	338
Page Count	6
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	85
Issue Number	3
e-ISSN	14396327
Language	English
Publisher	Springer-Verlag
Publisher Date	2001-06-08
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physiology (medical) Public Health, Environmental and Occupational Health Sports Science

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