NDLI: Comparison and reliability of two non-invasive acetylene uptake techniques for the measurement of cardiac output

Content Provider	Springer Nature Link
Author	Dibski, D. W. Smith, D. J. Jensen, R. rris, S. R. Ford, G. T.
Copyright Year	2005
Abstract	Comparison and reliability of two non-invasive acetylene uptake techniques for the measurement of cardiac output. Thirteen trained male cyclists performed CO2 rebreathing (CO2RB) at intensities from rest to 200 W, and open-circuit acetylene uptake (OpCirc) and single-breath acetylene uptake (SB) at intensities from rest to 300 W, with all procedures using 50 W increments. Oxygen consumption $$(\dot V{\text{O}}_{2}),$$ cardiac output $$(\dot Q),$$ and heart rate (HR), were measured at each stage, and the values for each variable were compared within each intensity to determine reliability of the measuring device. Both the OpCirc and SBs were shown to be reliable measures of cardiac output (r = 0.95 and 0.92, respectively) with decreasing coefficients of variation (CV) as intensity increased, and were similar to published data. The $$\dot Q{\text{--}}\dot V{\text{O}}_{2}$$ relationship using the SB diverged from the regression line for OpCirc and CO2RB. Linear regression of the $$\dot Q{\text{--}}\dot V{\text{O}}_{2}$$ relationship for CO2RB was $$y = 6.18 \times \dot V{\text{O}}_{2} + 2.59,$$ for OpCirc was $$y = 6.12 \times \dot V{\text{O}}_{2} + 2.98,$$ and for SB was $$y = 5.05 \times \dot V{\text{O}}_{2} + 3.76. $$ The OpCirc and SBs were both shown to be reliable techniques for measuring cardiac output, comparable to previously reported cardiac output measurements, and suitable for use in exercise testing. However, the SB, requiring a constant, slow exhalation rate, made the procedure difficult to perform at higher exercise intensities.
Starting Page	670
Ending Page	680
Page Count	11
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	94
Issue Number	5
e-ISSN	14396327
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-05-26
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	New methodologies Exercise Heart Reliability
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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