Muscle oxygenation and pulmonary gas exchange kinetics during cycling exercise on-transitions in humans. (Articolo in rivista)

Type
Label
  • Muscle oxygenation and pulmonary gas exchange kinetics during cycling exercise on-transitions in humans. (Articolo in rivista) (literal)
Anno
  • 2003-01-01T00:00:00+01:00 (literal)
Alternative label
  • Grassi B., Pogliaghi S., Rampichini S., Quaresima V., Ferrari M., Marconi C., Cerretelli P. (2003)
    Muscle oxygenation and pulmonary gas exchange kinetics during cycling exercise on-transitions in humans.
    in Journal of applied physiology (1985)
    (literal)
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  • Grassi B., Pogliaghi S., Rampichini S., Quaresima V., Ferrari M., Marconi C., Cerretelli P. (literal)
Pagina inizio
  • 149 (literal)
Pagina fine
  • 158 (literal)
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  • 95 (literal)
Rivista
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  • Citazioni al 26/01/09: 63 Citazioni al 2007 (escluso autocitazioni): 46 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Titolo
  • Muscle oxygenation and pulmonary gas exchange kinetics during cycling exercise on-transitions in humans. (literal)
Abstract
  • Near-infrared spectroscopy (NIRS) was utilized to gain insights into the kinetics of oxidative metabolism during exercise transitions. Ten untrained young men were tested on a cycle ergometer during transitions from unloaded pedaling to 5 min of constant-load exercise below (VT) the ventilatory threshold. Vastus lateralis oxygenation was determined by NIRS, and pulmonary O2 uptake (Vo --> Vo2) was determined breath-by-breath. Changes in deoxygenated hemoglobin + myoglobin concentration Delta[deoxy(Hb + Mb)] were taken as a muscle oxygenation index. At the transition, [Delta[deoxy(Hb + Mb)]] was unmodified [time delay (TD)] for 8.9 +/- 0.5 s at VT (both significantly different from 0) and then increased, following a monoexponential function [time constant (tau) = 8.5 +/- 0.9 s for VT]. For >VT a slow component of Delta[deoxy(Hb + Mb)] on-kinetics was observed in 9 of 10 subjects after 75.0 +/- 14.0 s of exercise. A significant correlation was described between the mean response time (MRT = TD + tau) of the primary component of Delta[deoxy(Hb + Mb)] on-kinetics and the tau of the primary component of the pulmonary Vo2 on-kinetics. The constant muscle oxygenation during the initial phase of the on-transition indicates a tight coupling between increases in O2 delivery and O2 utilization. The lack of a drop in muscle oxygenation at the transition suggests adequacy of O2 availability in relation to needs. (literal)
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