The  Response at the Onset of Severe Intensity Exercise

Hill, David W.; Stevens, Emily

doi:10.1139/h01-022

Cited by 19 publications

(43 citation statements)

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“…A fast adjustment on the VO 2 is desirable as the velocity of the O 2 deficit accumulation is minimized, generating lower levels of lactic acid. However, these adjustments are limited by the capacity of the cardiovascular system of redistributing the blood flow fastly and maintaining blood pressure within adequate levels, making the VO 2 increase kinetics, given by the time constant (τ) to be slower in severe exercises than in moderate intensities (25) , above all when close to VO 2 plateau in severe rectangular tests (26) . Thus, it seems that the increase on rest VO 2 up to its maximum value in rectangular exercises performed in the severe domain is generated by an "error signal" associated to a fixed anaerobic cost (~ 64% of the CTAnaer).…”

Section: Discussionmentioning

confidence: 99%

O limiar de esforço percebido (LEP) corresponde à potência crítica e a um indicador de máximo estado estável de consumo de oxigênio

Nakamura

Brunetto

Hirai

et al. 2005

Rev Bras Med Esporte

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The perceived exertion has been a target of several investigations, many times with association with objective physiological indicators in exercise. Recently, the identification of the perceived exertion threshold (PET) was proposed in the water running, which presented no difference in relation to the critical velocity. Theoretically, both parameters would be indicators of the maximum steady state of variables such as VO 2 and blood lactate. The objective of this work was to verify the coincidence between PET, critical power (PCrit) and an indicator of maximum VO 2 steady state (PCrit') in cycle ergometer. Eight male participants were submitted to progressive effort test in order to determine VO 2peak (46.7 ± 8.5 ml/kg/ min) and to four rectangular tests until exhaustion for the estimation of the critical power model parameters, PET and PCrit'. The hyperbolic relation between mechanical power and time spent for the VO 2peak to be reached in each test was used for the PCrit' estimation, considered as the asymptote in the power axis, and the portion of the anaerobic work capacity (CTAnaer) depleted up to the establishment of the VO 2peak (CTAnaer'). In order to identify PET, the straight lines angular coefficients of the perceived exertion in time (ordinate) and the powers used (abscissa) were adjusted to a linear function that provided a point in the power axis in which the perceived exertion would be kept indefinitely stable. The parameters PCrit and CTAnaer were estimated by means of the power-time non-linear equation. In order to compare the estimations of PET, PCrit and PCrit', the analysis of variance ANOVA was employed for repeated measurements, and the associations were established through the Pearson correlation. CTAnaer and CTAnaer' were compared through the t test. PET (180 ± 61), PCrit (174 ± 43) and PCrit' (176 ± 48) were not significantly different and the correlations were of 0.92-0.98. CTAnaer' (14,080 ± 5,219 J) was lower than CTAnaer (22,093 ± 9,042 J). One concludes that the PET predicts the intensity of PCrit and PCrit' with accuracy.

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Section: Discussionmentioning

confidence: 99%

O limiar de esforço percebido (LEP) corresponde à potência crítica e a um indicador de máximo estado estável de consumo de oxigênio

Nakamura

Brunetto

Hirai

et al. 2005

Rev Bras Med Esporte

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“…This finding might be due to the fact that active subjects were able to withstand intensities above the CV (i.e., higher D') for a longer period of time, resulting in the same Tlim at different relative intensities in the two groups (i.e., active subjects at a higher relative intensity than athletes). As a consequence, it is likely that the two groups studied present a similar TAVO 2 max for the same Tlim in supramaximal exercises, since an increase in relative intensity reduces TAVO 2 max 1,[9][10][11] . These factors may explain in part the lack of a difference in T LOW between groups.…”

Section: Effects Of Training Statusmentioning

confidence: 96%

“…Furthermore, an inverse relationship between exercise intensity and the time to achieve VO 2 max (TAVO 2 max) exists in this domain. In other words, the higher the exercise intensity, the lower TAVO 2 max 1,[9][10][11] . If the exercise intensity continues to be high, at a certain point, the constant intensity exercise will be so high that the individual reaches exhaustion even before VO 2 max is achieved 12 .…”

Section: Introductionmentioning

confidence: 98%

A maior velocidade e o menor tempo de exercício em que o VO2max é alcançado na corrida

Turnes

Aguiar

Cruz

et al. 2015

Rev. Bras. Cineantropom. Desempenho Hum.

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-The severe-intensity domain has important applications for the prescription of running training and the elaboration of experimental designs. The objectives of this study were: 1) to investigate the validity of a previously proposed model to estimate the shortest exercise duration (T LOW ) and the highest velocity (V HIGH ) at which VO 2 max is reached during running, and 2) to evaluate the effects of aerobic training status on these variables. Eight runners and eight physically active subjects performed several treadmill running exercise tests to exhaustion in order to mathematically estimate and to experimentally determine T LOW and V HIGH . The relationship between the time to achieve VO 2 max and time to exhaustion (Tlim) was used to estimate T LOW . V HIGH was estimated using the critical velocity model. V HIGH was assumed to be the highest velocity at which VO 2 was equal to or higher than the average VO 2 max minus one standard deviation. T LOW was defined as Tlim associated with V HIGH . Runners presented better aerobic fitness and higher V HIGH (22.2 ± 1.9 km.h ). However, T LOW did not differ between groups (runners: 101 ± 39 s; active subjects: 100 ± 35 s). T LOW and V HIGH were not well estimated by the model proposed, with high coefficients of variation (> 6%) and a low correlation coefficient (r<0.70), a fact reducing the validity of the model. It was concluded that aerobic training status positively affected only V HIGH . Furthermore, the model proposed presented low validity to estimate the upper boundary of the severe-intensity domain (i.e., V HIGH ), irrespective of the subjects' training status. Key words: Oxygen uptake; Physical education and training; Physical fitness; Running; Exercise. Resumo -O domínio severo tem importantes aplicações para a prescrição do treinamento de corrida e elaboração de delineamentos experimentais. O estudo teve como objetivos: 1) investigar a validade de um modelo proposto previamente para estimativa do menor tempo de exercício (T INF ) e maior velocidade (V SUP ) em que o VO 2 max é alcançado na corrida; e 2) comparar os efeitos do estado de treinamento nestes parâmetros. Oito corredores e oito indivíduos fisicamente ativos realizaram uma série de testes até a exaus-

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“…During the last few years several studies have been performed regarding the oxygen uptake ( 2 O V  ) response to constant load exercise in the severe intensity domain (Burnley et al, 2006;Carter et al, 2006;Duffield et al, 2006;Hill et al, 2002;Hill & Stevens, 2005;Hughson et al, 2000) which is commonly defined as an exercise intensity which, given a long enough duration, results in the attainment of…”

Section: Introductionmentioning

confidence: 99%

Influence of test duration on oxygen uptake attained during treadmill running

James

Sandals

Draper

et al. 2008

European Journal of Sport Science

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Previous investigations have revealed that in well-trained middle-distance runners, oxygen uptake (VO 2 ) does not attain maximal values (VO 2max ) in exhaustive treadmill trials where the VO 2 demand exceeds VO 2max . To date, this shortfall in the VO 2 attained has been demonstrated in trials as short as 2 min in duration. In this study, we investigated whether a reduction in exhaustive test duration influences the VO 2 attained during running on a treadmill. Six middle-distance runners participated in the study, completing an exhaustive 400 m and 800 m trial. These trials, together with a progressive test to determine VO 2max , were completed in a counterbalanced order. Oxygen uptakes attained during the 400 m and 800 m trials were compared to examine the influence of exhaustive test duration. A plateau in VO 2 was observed in all participants for the progressive test, demonstrating the attainment of VO 2max . The mean speed, duration, and resulting distance in the constant-speed exhaustive trials were 25.8 km × h (1 (s01.2), 55.8 s (s 02.3), and 400.2 m (s 020.2) for the 400 m trial, and 24.3 km × h (1 (s00.8), 108.4 s (s 021.2), and 730.1 m (s0129.1) for the 800 m trial, respectively. A paired-samples t-test revealed a significantly different (P00.018)%VO 2max was attained for the 400 m (85.7%, s 03.0) and 800 m (89.1%, s05.0) trials. In conclusion, VO 2 did not reach VO 2max during the exhaustive constant-speed 400 m and 800 m trials, but the test duration does influence the%VO 2max achieved. Specifically, the VO 2 attained becomes progressively further below VO 2max as trial duration is reduced, such that 89% and 86% VO 2max is achieved in exhaustive 800 m and 400 m constant-speed trials, respectively.

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The Response at the Onset of Severe Intensity Exercise

Cited by 19 publications

References 0 publications

O limiar de esforço percebido (LEP) corresponde à potência crítica e a um indicador de máximo estado estável de consumo de oxigênio

O limiar de esforço percebido (LEP) corresponde à potência crítica e a um indicador de máximo estado estável de consumo de oxigênio

A maior velocidade e o menor tempo de exercício em que o VO2max é alcançado na corrida

Influence of test duration on oxygen uptake attained during treadmill running

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