Oxygen Uptake Kinetics During Exercise

Xu, Fan; Rhodes, E. C.

doi:10.2165/00007256-199927050-00003

Cited by 174 publications

(139 citation statements)

References 95 publications

(196 reference statements)

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“…Exercise intensity below the Ian ind is characterized by the presence of three distinct phases: cardiodynamic, fast and the VO 2 stabilization which occurs three minutes after the beginning of the exercise 16 . The intensity immediately above the lan ind presents an additional phase (slow component), which delays the onset in the VO 2 stabilization, appearing approximately 10…”

Section: Resultsmentioning

confidence: 99%

Cinética do consumo de oxigênio a intensidades de nado moderada e extrema

Sousa¹,

Jesus²,

Figueiredo³

et al. 2013

Rev Bras Med Esporte

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Introduction: Traditionally, studies regarding oxygen consumption kinetics are conducted at lower intensities, very different from those in which the sports performance occurs. Objective: Knowing that the magnitude of this physiological parameter depends on the intensity in which the effort occurs, it was intended with this study to compare the oxygen consumption kinetics in the 200 m front crawl at two different intensities: moderate and extreme. Methods: Ten male swimmers of international level performed two tests separated by 24h: (i) progressive and intermittent protocol of 7 x 200 m, with 30 seconds intervals and with increments of 0.05m.s -1 , to determine the anaerobic threshold correspondent step; and, (ii) 200 m at maximal velocity, in both expiratory gases were continuously collected breath-by-breath. Results: Significant differences were obtained between amplitude and time constant determined in the 200 m at extreme and moderate intensities, respectively (38.53 ± 5.30 ml. kg -1 .min -1 versus 26.32 ± 9.73 ml. kg -1 .min -1 and 13.21 ± 5.86 s versus 18.89 ± 6.53 s (p ≤ 0.05). No differences were found in time delay (9.47 ± 6.42 s versus 12.36 ± 6.62 s, at extreme and moderate intensity, respectively (p ≤ 0.05). A negative correlation between time delay and time constant at the moderate intensity was reported (r = -0.74, p ≤ 0.05). Conclusions: Both intensities were well described by double-exponential fittings and there were significant differences between them in terms of amplitude and time constant.

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Section: Resultsmentioning

confidence: 99%

Cinética do consumo de oxigênio a intensidades de nado moderada e extrema

Sousa¹,

Jesus²,

Figueiredo³

et al. 2013

Rev Bras Med Esporte

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“…Three exercise intensity domains have been identified through the kinetics of the pulmonary oxygen consumption (VO 2 ) and the response of the blood lactate ([La]) concentration during exercises of constant load, namely: moderate, heavy and severe 1,2 . The moderate domain corresponds to all the exercise intensities which can be performed without alteration of blood lactate concerning the rest values; that is, below the lactate threshold (LT) 1 .…”

Section: Introductionmentioning

confidence: 99%

“…The moderate domain corresponds to all the exercise intensities which can be performed without alteration of blood lactate concerning the rest values; that is, below the lactate threshold (LT) 1 . The heavy domain starts from the lowest intensity at which blood lactate increases and has as highest threshold the critical power (CP) 2 . The severe domain is characterized for the reach of the maximal oxygen consumption (VO 2max ), being limited between the CP and the exercise intensity which allows minimal time to VO 2max acquisition (i.e., Isup) 3 .…”

Section: Introductionmentioning

confidence: 99%

Aptidão aeróbia e amplitude dos domínios de intensidade de exercício no ciclismo

Caritá

Caputo

Greco

2013

Rev Bras Med Esporte

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Introduction: The determination of the exercise intensity domains has important implications for the aerobic training prescription and elaboration of experimental designs. Objective: The aim of this study was to analyze the effects of aerobic fitness level on the amplitude of the exercise intensity domains during cycling. Methods: Twelve cyclists (CYC), eleven runners (RUN) and eight untrained subjects (NT) underwent the following protocols on different days: 1) progressive test to determine lactate threshold (LT), maximal oxygen uptake (VO 2max ) and its corresponding intensity (IVO 2max); 2) three constant workload tests until exhaustion at 95, 100 and 110% IVO 2max to determine critical power (CP); 3) constant workload tests until exhaustion to determine the highest intensity at which VO 2max is reached (I sup ). Results: The amplitude of the moderate domain was similar between CYC (52 ± 8%) and RUN (47 ± 4%) and significantly greater in CYC when compared with NT (41 ± 7%). The heavy domain was significantly smaller in CYC (17 ± 6%) when compared with RUN (27 ± 6%) and NT (27 ± 9%). In relation to severe domain, there were no significant differences among CYC (31 ± 7%), RUN (26 ± 5%) and NT (31 ± 7%). Conclusion: It can be concluded that the heavy domain is more sensitive to changes determined by the aerobic fitness level; there is a need hence to observe the training specificity, when high level of physiological adaptation is aimed..

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“…While the direct causal relationship between oxygen deficit and EPOC is not firmly established, the two are quantitatively closely related, especially at moderate work rates (Hill and Lupton, 1923;Ren et al, 1989;Paterson and Whipp, 1991). It has generally been reported that during heavy work or exercise, EPOC is less than the oxygen deficit (Xu and Rhodes, 1999). However, Bearden and Moffatt (2000) demonstrated that when the fast and slow components of oxygen-deficit accumulation are considered, this difference is reduced.…”

Section: Methodsmentioning

confidence: 99%

Modeling energy expenditure and oxygen consumption in human exposure models: accounting for fatigue and EPOC

Isaacs

Glen

McCurdy

et al. 2007

J Expo Sci Environ Epidemiol

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Human exposure and dose models often require a quantification of oxygen consumption for a simulated individual. Oxygen consumption is dependent on the modeled individual's physical activity level as described in an activity diary. Activity level is quantified via standardized values of metabolic equivalents of work (METS) for the activity being performed and converted into activity-specific oxygen consumption estimates. However, oxygen consumption remains elevated after a moderate-or high-intensity activity is completed. This effect, which is termed excess post-exercise oxygen consumption (EPOC), requires upward adjustment of the METS estimates that follow high-energy expenditure events, to model subsequent increased ventilation and intake dose rates. In addition, since an individual's capacity for work decreases during extended activity, methods are also required to adjust downward those METS estimates that exceed physiologically realistic limits over time. A unified method for simultaneously performing these adjustments is developed. The method simulates a cumulative oxygen deficit for each individual and uses it to impose appropriate time-dependent reductions in the METS time series and additions for EPOC. The relationships between the oxygen deficit and METS limits are nonlinear and are derived from published data on work capacity and oxygen consumption. These modifications result in improved modeling of ventilation patterns, and should improve intake dose estimates associated with exposure to airborne environmental contaminants.

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Oxygen Uptake Kinetics During Exercise

Cited by 174 publications

References 95 publications

Cinética do consumo de oxigênio a intensidades de nado moderada e extrema

Cinética do consumo de oxigênio a intensidades de nado moderada e extrema

Aptidão aeróbia e amplitude dos domínios de intensidade de exercício no ciclismo

Modeling energy expenditure and oxygen consumption in human exposure models: accounting for fatigue and EPOC

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