NDLI: Cardiac output and oxygen release during very high-intensity exercise performed until exhaustion

Content Provider	Springer Nature Link
Author	Richard, Ruddy Lonsdorfer Wolf, Evelyne Dufour, Stéphane Doutreleau, Stéphane Oswald Mammosser, Monique Billat, Véronique L. Lonsdorfer, Jean
Copyright Year	2004
Abstract	Our objectives were firstly, to study the patterns of the cardiac output (Q̇) and the arteriovenous oxygen difference [(a−v̄)O2] responses to oxygen uptake (V̇O2) during constant workload exercise (CWE) performed above the respiratory compensation point (RCP), and secondly, to establish the relationships between their kinetics and the time to exhaustion. Nine subjects performed two tests: a maximal incremental exercise test (IET) to determine the maximal V̇O2 ( V̇ O2peak), and a CWE test to exhaustion, performed at p Δ50 (intermediate power between RCP and V̇O2peak). During CWE, V̇ O2 was measured breath-by-breath, Q̇ was measured beat-by-beat with an impedance device, and blood lactate (LA) was sampled each minute. To calculate ( a−v̄ )O2, the values of V̇ O2 and Q̇ were synchronised over 10 s intervals. A fitting method was used to describe the V̇ O2, Q̇ and ( a−v̄ )O2 kinetics. The ( a−v̄ )O2 difference followed a rapid monoexponential function, whereas both V̇ O2 and Q̇ were best fitted by a single exponential plus linear increase: the time constant (τ) V̇ O2 [57 (20 s)] was similar to τ ( a−v̄ )O2, whereas τ for Q̇ was significantly higher [89 (34) s, P <0.05] (values expressed as the mean and standard error). LA started to increase after 2 min CWE then increased rapidly, reaching a similar maximal value as that seen during the IET. During CWE, the rapid component of V̇O2 uptake was determined by a rapid and maximal ( a−v̄)O2 extraction coupled with a two-fold longer Q̇ increase. It is likely that lactic acidosis markedly increased oxygen availability, which when associated with the slow linear increase of Q̇ , may account for the V̇ O2 slow component. Time to exhaustion was larger in individuals with shorter time delay for ( a−v̄ )O2 and a greater τ for Q̇.
Starting Page	9
Ending Page	18
Page Count	10
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	93
Issue Number	1
e-ISSN	14396327
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-07-27
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Oxygen slow component Cardiac output Arteriovenous oxygen difference Time to exhaustion
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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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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