A detailed comparison of oxygen uptake kinetics at a range of exercise intensities

C. C. T. Clark, Stephen Draper

Research output: Contribution to journalJournal Article

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Abstract

Aim: The aim of this study was to comprehensively examine oxygen uptake (VO2) kinetics during cycling through mathematical modeling of the breath-by-breath gas exchange responses across eight conditions of unloaded cycling to moderate to high-intensity exercise. Methods: Following determination of GET and V O2peak, eight participants (age: 24±8y; height: 1.78±0.09m; mass: 76.5±10.1kg; V O2peak: 3.89±0.72 L.min-1) completed a series of square-wave rest-to-exercise transitions at; -20%∆ (GET minus 20% of the difference in V O2 between that at GET and VO2peak), -10%∆, GET, 10%∆, 20%∆, 30%∆, 40%∆, and 50%∆. The V O2 kinetic response was modelled using mono- and bi-exponential non-linear regression techniques. The difference in the standard error of the estimates (SEE) for the mono- and bi-exponential models, and the slope of V O2 vs time (for the final minute of exercise) were analysed using paired and one-sample t-tests, respectively. Results: The bi-exponential model SEE was lower than the mono-exponential model across all exercise intensities (p0.05). The modelled slow component time constants, typical of literature reported values, indicated that the V O2 kinetic response would not be completed during the duration of the exercise. Conclusion: It was shown that the addition of the more complex bi-exponential model resulted in a better model fit across all intensities (notably including sub-GET intensities). The slow component phase was incomplete in all cases, even when the investigation of slopes indicated that a steady state had been achieved.
Original languageEnglish
JournalMotriz. Revista de Educacao Fisica
Volume25
Issue number1
DOIs
Publication statusPublished - 29 Apr 2019

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Oxygen
Gases
mathematical modeling
regression
Values
time
N-(3-chloro-4-methylphenyl)-4-methyl-1,2,3-thiadiazole-5-carboxamide

Keywords

  • Cycling
  • Exercise physiology
  • Gas exchange
  • Model
  • Oxygen uptake

Cite this

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title = "A detailed comparison of oxygen uptake kinetics at a range of exercise intensities",
abstract = "Aim: The aim of this study was to comprehensively examine oxygen uptake (VO2) kinetics during cycling through mathematical modeling of the breath-by-breath gas exchange responses across eight conditions of unloaded cycling to moderate to high-intensity exercise. Methods: Following determination of GET and V O2peak, eight participants (age: 24±8y; height: 1.78±0.09m; mass: 76.5±10.1kg; V O2peak: 3.89±0.72 L.min-1) completed a series of square-wave rest-to-exercise transitions at; -20{\%}∆ (GET minus 20{\%} of the difference in V O2 between that at GET and VO2peak), -10{\%}∆, GET, 10{\%}∆, 20{\%}∆, 30{\%}∆, 40{\%}∆, and 50{\%}∆. The V O2 kinetic response was modelled using mono- and bi-exponential non-linear regression techniques. The difference in the standard error of the estimates (SEE) for the mono- and bi-exponential models, and the slope of V O2 vs time (for the final minute of exercise) were analysed using paired and one-sample t-tests, respectively. Results: The bi-exponential model SEE was lower than the mono-exponential model across all exercise intensities (p0.05). The modelled slow component time constants, typical of literature reported values, indicated that the V O2 kinetic response would not be completed during the duration of the exercise. Conclusion: It was shown that the addition of the more complex bi-exponential model resulted in a better model fit across all intensities (notably including sub-GET intensities). The slow component phase was incomplete in all cases, even when the investigation of slopes indicated that a steady state had been achieved.",
keywords = "Cycling, Exercise physiology, Gas exchange, Model, Oxygen uptake",
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language = "English",
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A detailed comparison of oxygen uptake kinetics at a range of exercise intensities. / Clark, C. C. T.; Draper, Stephen.

In: Motriz. Revista de Educacao Fisica, Vol. 25, No. 1, 29.04.2019.

Research output: Contribution to journalJournal Article

TY - JOUR

T1 - A detailed comparison of oxygen uptake kinetics at a range of exercise intensities

AU - Clark, C. C. T.

AU - Draper, Stephen

PY - 2019/4/29

Y1 - 2019/4/29

N2 - Aim: The aim of this study was to comprehensively examine oxygen uptake (VO2) kinetics during cycling through mathematical modeling of the breath-by-breath gas exchange responses across eight conditions of unloaded cycling to moderate to high-intensity exercise. Methods: Following determination of GET and V O2peak, eight participants (age: 24±8y; height: 1.78±0.09m; mass: 76.5±10.1kg; V O2peak: 3.89±0.72 L.min-1) completed a series of square-wave rest-to-exercise transitions at; -20%∆ (GET minus 20% of the difference in V O2 between that at GET and VO2peak), -10%∆, GET, 10%∆, 20%∆, 30%∆, 40%∆, and 50%∆. The V O2 kinetic response was modelled using mono- and bi-exponential non-linear regression techniques. The difference in the standard error of the estimates (SEE) for the mono- and bi-exponential models, and the slope of V O2 vs time (for the final minute of exercise) were analysed using paired and one-sample t-tests, respectively. Results: The bi-exponential model SEE was lower than the mono-exponential model across all exercise intensities (p0.05). The modelled slow component time constants, typical of literature reported values, indicated that the V O2 kinetic response would not be completed during the duration of the exercise. Conclusion: It was shown that the addition of the more complex bi-exponential model resulted in a better model fit across all intensities (notably including sub-GET intensities). The slow component phase was incomplete in all cases, even when the investigation of slopes indicated that a steady state had been achieved.

AB - Aim: The aim of this study was to comprehensively examine oxygen uptake (VO2) kinetics during cycling through mathematical modeling of the breath-by-breath gas exchange responses across eight conditions of unloaded cycling to moderate to high-intensity exercise. Methods: Following determination of GET and V O2peak, eight participants (age: 24±8y; height: 1.78±0.09m; mass: 76.5±10.1kg; V O2peak: 3.89±0.72 L.min-1) completed a series of square-wave rest-to-exercise transitions at; -20%∆ (GET minus 20% of the difference in V O2 between that at GET and VO2peak), -10%∆, GET, 10%∆, 20%∆, 30%∆, 40%∆, and 50%∆. The V O2 kinetic response was modelled using mono- and bi-exponential non-linear regression techniques. The difference in the standard error of the estimates (SEE) for the mono- and bi-exponential models, and the slope of V O2 vs time (for the final minute of exercise) were analysed using paired and one-sample t-tests, respectively. Results: The bi-exponential model SEE was lower than the mono-exponential model across all exercise intensities (p0.05). The modelled slow component time constants, typical of literature reported values, indicated that the V O2 kinetic response would not be completed during the duration of the exercise. Conclusion: It was shown that the addition of the more complex bi-exponential model resulted in a better model fit across all intensities (notably including sub-GET intensities). The slow component phase was incomplete in all cases, even when the investigation of slopes indicated that a steady state had been achieved.

KW - Cycling

KW - Exercise physiology

KW - Gas exchange

KW - Model

KW - Oxygen uptake

U2 - 10.1590/S1980-6574201900010010

DO - 10.1590/S1980-6574201900010010

M3 - Journal Article

VL - 25

JO - Motriz. Revista de Educacao Fisica

JF - Motriz. Revista de Educacao Fisica

SN - 1415-9805

IS - 1

ER -