A detailed comparison of oxygen uptake kinetics at a range of exercise intensities
Motriz (Online)
;
25(1): e101935, 2019. tab, graf, ilus
Article
Dans Anglais
| LILACS
| ID: biblio-1002697
ABSTRACT
Aim:
The aim of this study was to comprehensively examine oxygen uptake (VÌO2) 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 VÌO2peak, eight participants (age 24±8y; height 1.78±0.09m; mass 76.5±10.1kg; VÌO2peak 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 VÌO2 between that at GET and VO2peak), -10%∆, GET, 10%∆, 20%∆, 30%∆, 40%∆, and 50%∆. The VÌO2 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 VÌO2 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 (p<0.05), indicating a better model fit. Steady-state VÌO2 was achieved across all exercise intensities (all VÌO2 vs. time slopes; p>0.05). The modelled slow component time constants, typical of literature reported values, indicated that the VÌO2 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.(AU)
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Consommation d'oxygène
/
Cyclisme
/
Exercice physique
/
Effort physique
Limites du sujet:
Adulte
/
Humains
/
Mâle
langue:
Anglais
Texte intégral:
Motriz (Online)
Thème du journal:
EducaÆo F¡sica e Treinamento
/
Medicina Esportiva
/
Medicina F¡sica e ReabilitaÆo
Année:
2019
Type:
Article
Pays d'affiliation:
Royaume-Uni
Institution/Pays d'affiliation:
Hartpury University/GB
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