Oxygen kinetics for constant work loads at various altitudes.

Bason, R; Billings, Charles E.; Fox, Edward L.; Gerke, Roscoe H.

doi:10.1152/jappl.1973.35.4.497

Cited by 12 publications

(3 citation statements)

References 10 publications

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“…Although it has been reported that a O 2 ss is reached after 3±4 min at moderate intensity (Whipp and Mahler 1980), several studies have reported the appearance of a slow O 2 component after the 3rd min of exercise above the anaerobic threshold (Whipp and Wasserman 1972;Bason et al 1973;Linnarsson 1974;Whipp and Mahler 1980) in untrained as well as in trained subjects (Henson et al 1989). Because it has been found that this O 2 slow component could lead O 2 to increase up to exhaustion during exercise of severe intensity (Bason et al 1973;Fig.…”

Section: Discussionmentioning

confidence: 98%

Influence of the oxygen uptake slow component on the aerobic energy cost of high-intensity submaximal treadmill running in humans

Bernard

Maddio

Ouattara

et al. 1998

European Journal of Applied Physiology

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During high-intensity running, the oxygen uptake (VO2) kinetics is characterised by a slow component which delays the attainment of the steady-state beyond the 3rd min of exercise. To assess if the aerobic energy cost of running measured at the 3rd min (C3) adequately reflects the variability of the true aerobic energy cost measured during the steady-state (Css), 13 highly-trained runners completed sessions of square-wave running at intensities above 80% maximal oxygen uptake (VO2max) on a level treadmill. To evaluate the time at which the steady-state VO2 was attained (tss), the VO2 responses were described using a general double-exponential equation and tss was defined as the time at which VO2 was less than 1% below the asymptotic value given by the model. All the subjects achieved a steady state for intensities equal to or greater than 92% VO2max, and 8 out of 13 achieved it at 99% VO2max. In all cases, tss was less than 13 min. For intensities greater than 85% VO2max, Css was significantly higher than C3 and was positively related to %VO2 max (r=0.44; P < 0.001) while C3 remained constant. The C3 only explained moderately the variability of Css (0.39 < r2 < 0.72, depending on the velocity or the (relative intensity at which the relationship was calculated). Moreover, the excess aerobic energy cost of running the (difference between Css and C3) was well predicted by age (0.90 < r2 < 0.93). Therefore, when the aerobic profile of runners is evaluated, it is recommended that their running efficiencies at velocities which reflect their race intensities should be determined, with VO2 data being measured at the true steady-state.

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Section: Discussionmentioning

confidence: 98%

Influence of the oxygen uptake slow component on the aerobic energy cost of high-intensity submaximal treadmill running in humans

Bernard

Maddio

Ouattara

et al. 1998

European Journal of Applied Physiology

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“…The error is thus: *Although Linnarsson (6) and Whipp et al (12) have described a small early phase of exercise 'T02 kinetics that does not precisely (1) conform to the subsequently, and dominant, exponential behavior, this does not confound the conceptual basis of our present critique. It has recently been proposed that the half time for the kinetics of "02 during exercise may be accurately determined from a linear fit to the exponential response on linear coordinates.…”

Section: Introductionmentioning

confidence: 70%

“…For example, to what extent is k determined by the compartmental washin of transported 02 or by enzymatic constraints? Consequently, considerable attention has been paid to precise determination of k for V02 kinetics (2,4,6,8,10) and upon the factors that influence it (1,5,7,9,11). The usual procedure has been to establish how well the ontransient data are fit by the expression:…”

Section: Introductionmentioning

confidence: 99%

Characterizing O₂Uptake Response Kinetics During Exercise

Whipp¹,

Casaburi²

1982

Int J Sports Med

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It has recently been proposed that the half time for the kinetics of VO2 during exercise may be accurately determined from a linear fit to the exponential response on linear coordinates. We demonstrate that although this is the case for two periods of data utilization, it is not true for any others, and that small variations in this period markedly influence the estimate. Furthermore, it is necessary to know the parameters of the response to determine the appropriate period of data collection. We conclude that the proposed linear estimation procedure is likely to yield erroneous values for VO2 kinetics during exercise.

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Oxygen Uptake Kinetics

Poole

Jones

2012

Comprehensive Physiology

417

493

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Muscular exercise requires transitions to and from metabolic rates often exceeding an order of magnitude above resting and places prodigious demands on the oxidative machinery and O2-transport pathway. The science of kinetics seeks to characterize the dynamic profiles of the respiratory, cardiovascular, and muscular systems and their integration to resolve the essential control mechanisms of muscle energetics and oxidative function: a goal not feasible using the steady-state response. Essential features of the O2 uptake (VO2) kinetics response are highly conserved across the animal kingdom. For a given metabolic demand, fast VO2 kinetics mandates a smaller O2 deficit, less substrate-level phosphorylation and high exercise tolerance. By the same token, slow VO2 kinetics incurs a high O2 deficit, presents a greater challenge to homeostasis and presages poor exercise tolerance. Compelling evidence supports that, in healthy individuals walking, running, or cycling upright, VO2 kinetics control resides within the exercising muscle(s) and is therefore not dependent upon, or limited by, upstream O2-transport systems. However, disease, aging, and other imposed constraints may redistribute VO2 kinetics control more proximally within the O2-transport system. Greater understanding of VO2 kinetics control and, in particular, its relation to the plasticity of the O2-transport/utilization system is considered important for improving the human condition, not just in athletic populations, but crucially for patients suffering from pathologically slowed VO2 kinetics as well as the burgeoning elderly population.

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Oxygen kinetics for constant work loads at various altitudes.

Cited by 12 publications

References 10 publications

Influence of the oxygen uptake slow component on the aerobic energy cost of high-intensity submaximal treadmill running in humans

Influence of the oxygen uptake slow component on the aerobic energy cost of high-intensity submaximal treadmill running in humans

Characterizing O₂Uptake Response Kinetics During Exercise

Oxygen Uptake Kinetics

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Oxygen kinetics for constant work loads at various altitudes.

Cited by 12 publications

References 10 publications

Influence of the oxygen uptake slow component on the aerobic energy cost of high-intensity submaximal treadmill running in humans

Influence of the oxygen uptake slow component on the aerobic energy cost of high-intensity submaximal treadmill running in humans

Characterizing O2Uptake Response Kinetics During Exercise

Oxygen Uptake Kinetics

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Characterizing O₂Uptake Response Kinetics During Exercise