Observatorio de I+D+i UPM

Memorias de investigación
Artículos en revistas:
Rebuttal to point - counterpoint: The kinetics of oxygen uptake during muscular exercise do / do not manifest time-delayed phases
Año:2009
Áreas de investigación
  • Educación física y deporte
Datos
Descripción
I expected the Stirling and Zakynthinaki Counterpoint (2) to provide alternative physiological explanations for the discernibly different oxygen uptake (V¿ O2) kinetics at different exercise intensities. Some of their points seem warranted: the lack of justification for an exponential phase () 1 fit and the ¿slow-phase¿ exponential fit reflecting a process with a single time constant () and gain. But so many of their assertions demand challenge. For example, they state that the problems regarding the decrease of ¿R¿ as an indicator of what they term TD2, ¿are due to trying to fit time-delayed phases to data with no such features.¿ Well, there are such features! The 1¿2 transition often coincides with a time-delayed transient R decrease (4); where not, it is not that the delayed component is not there but that it is ¿smeared¿ by increased perfusion from other regions and/or transient hyperventilation. Its presence is physiologically justified: the transient alkalosis (1, 3), resulting from proton trapping as [phosphocreatine] decreases, retains CO2 intramuscularly. When the 1¿2 transition cannot be clearly determined from R, a portion of the 1 response should not be allowed to influence the 2- estimation: this is a physiological control parameter not a parameter of convenience (6), as are the 1 and slow-component s. Deleting a portion of the early response slightly greater than the real delay may influence the confidence of the 2- estimation; deleting too little will affect its value¿a greater concern. Also, we disagree with their assertion
Internacional
Si
JCR del ISI
Si
Título de la revista
JOURNAL OF APPLIED PHYSIOLOGY
ISSN
8750-7587
Factor de impacto JCR
3,658
Información de impacto
Volumen
DOI
Número de revista
0
Desde la página
1667
Hasta la página
1668
Mes
ENERO
Ranking
Esta actividad pertenece a memorias de investigación
Participantes
  • Autor: James Robert Stirling . (UPM)
  • Autor: María Zakinthinaki . (UPM)
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Deporte Rendimiento
  • Departamento: Deportes
S2i 2021 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)