Time to exhaustion at and above critical power in trained cyclists: The relationship between heavy and severe intensity domains

Lucas, Ricardo Dantas de; Souza, Kristopher Mendes de; Costa, Vitor Pereira; Grossl, Talita; Guglielmo, Luiz Guilherme Antonacci

doi:10.1016/j.scispo.2012.04.004

Cited by 32 publications

(36 citation statements)

References 34 publications

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“…This is consistent with the proposed SEE values of less than 2% and 10% for CP and W', respectively 30 . Additionally, the findings and suggestions of the present study are restricted to cycling exercise and untrained subjects, since CP occurs at a higher relative intensity in trained subjects 3,9 . Indeed, de Lucas et al 3 and Caputo and Denadai 9 have demonstrated that in well-trained cyclists CP averaged at 65% and 75% ∆, respectively.…”

Section: Discussionmentioning

confidence: 95%

“…Particularly, given that CP represents an important demarcator of metabolic and physiological stability and a fundamental index for understanding high-intensity exercise tolerance 3,[5][6][7][8] , its relevance cannot be overemphasized. However, the determination of CP is especially demanding in terms of the subject's effort and testing time 9 .…”

Section: Introductionmentioning

confidence: 99%

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Agreement analysis between critical power and intensity corresponding to 50% in cycling exercise

Souza

Lucas

Salvador

et al. 2016

Rev. Bras. Cineantropom. Desempenho Hum.

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Abstract∆) between oxygen uptake (VO 2 ) at lactate threshold (LT) and maximal oxygen uptake (VO 2max ) in untrained subjects during cycling exercise. Fifteen healthy male subjects (age: 26.0 ± 3.5 years; body weight: 76.6 ± 10.4 kg; height: 178.2 ± 7.6 cm) volunteered to participate in the study. Each subject performed a series of tests to determine LT, VO 2 LT, CP, VO 2 CP, 50% ∆, VO 2 50% ∆, and VO 2max 2 LT, CP, VO 2 CP, 50% ∆, VO 2 50% ∆ and VO 2max were 109 ± 15 W, 1.84 ± 0.23 L.min ∆ (t = 0.16; p = 0.87) or between VO 2 CP and VO 2 50% ∆ (t = 0.12; p = 0.90). However, the bias ± 95% limits of agreement for comparison between CP and 50% ∆ and between VO 2 CP and VO 2 50% ∆ were 1 ± 27 W (0.3 ± 14.1%) and 0.01 ± 0.24 L.min -1 (0.2 ± 8.9%), respectively. In summary, the mean CP and 50% ∆ values w limits of agreement between the two intensities, CP estimated based on 50% ∆ might taken into account.

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Section: Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Agreement analysis between critical power and intensity corresponding to 50% in cycling exercise

Souza

Lucas

Salvador

et al. 2016

Rev. Bras. Cineantropom. Desempenho Hum.

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“…No entanto, ao se analisar os t Lim de estudos realizados em indivíduos com diferentes níveis de aptidão aeróbia, verifica-se que, apesar da diferença em alguns parâmetros da cinética do VO 2 , o t Lim em exercícios realizados no domínio severo foi similar entre os grupos (CAPUTO; DENADAI, 2008). Da mesma forma, o t Lim verificado neste estudo é similar ao obtido em indivíduos treinados no ciclismo (BARON et al, 2005;DE LUCAS et al, 2013). Além do número reduzido de sujeitos em cada grupo experimental, outra limitação deste estudo foi a utilização de uma única transição para a análise dos parâmetros da cinética do VO 2 , em função do 420 número elevado de testes realizados pelos voluntários, que pode influenciar a estimativa dos parâmetros da cinética do VO 2 pelas flutuações dos dados respiração-a-respiração (LAMARRA et al, 1987).…”

Section: Gt (N = 6)unclassified

“…Este índice tem caracterizado, em diferentes estudos, a máxima taxa de utilização energética no músculo, que pode ser sustentada sem uma progressiva ativação das reservas anaeróbias (POOLE, 2009). A classificação da intensidade do exercício na PC (ou VC), enquanto esforço que pode ser mantido por tempo prolongado, ou indeterminado, sem provocar exaustão (VAUTIER et al, 1995), ou enquanto limítrofe entre os domínios pesado e severo (WHIPP et al, 2005) tem sido contestada, respectivamente, pela instabilidade de parâmetros fisiológicos (BRICKLEY et al, 2002) e pela variabilidade de até 18% dos valores de PC (ou VC) entre métodos de estimativa (BULL et al, 2000), com variações de respostas de 84 a 94%VO 2 max (LECLAIR et al, 2008;DE LUCAS et al, 2013) e tempos de exaustão igualmente variados (22 a 40 minutos) (SCARBOROUGH et al, 1991;DE LUCAS et al, 2013), em indivíduos treinados.…”

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Cinética do VO2 durante o exercício realizado na potência crítica em ciclistas e indivíduos não-treinados no ciclismo

Caritá

Greco

Filho

2013

Motriz: rev. educ. fis.

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IntroduçãoO exercício aeróbio pode ser realizado em diferentes domínios de intensidade, nos quais as respostas da concentração de lactato sanguíneo ([La]) e do consumo de oxigênio (VO 2 ) apresentam comportamentos bem característicos POOLE, 1996; CARTER et al., 2002;WHIPP et al., 2005;BURNLEY, 2009 (POOLE et al., 1990;WHIPP et al., 2005), e em valores acima do predito pela relação VO 2 x carga ((POOLE et al., 1988) Motriz, Rio Claro, v.19 n.2, p.412-422, abr./jun. 2013 ) e relativo ao aumento do VO 2 em exercício (GT: 10,04,6% vs. GNT: 26,67,3%) foram menores para GT. O VO 2 ao final do exercício (GT: 89,88,4%VO 2 max vs. GNT: 97,42,8%VO 2 max) foi significativamente menor no grupo GT ( = 0,045), sendo similar ao VO 2 max no grupo GNT. Portanto, o nível de aptidão aeróbia pode influenciar as respostas do VO 2 ao exercício em PC. Palavras-chave: Ciclistas. Aptidão aeróbia. Exercício pesado. VO 2 Kinetics during exercise performed at critical power in cyclists and untrained individuals Abstract:The objective was to analyze the oxygen uptake (VO 2 ) kinetics during exercise performed at critical power (CP) in subjects with different aerobic status in cycling. Six trained cyclists (GT) and seven non-trained subjects (GNT) underwent to the following protocols in cyclergometer: (a) incremental to exhaustion to determine VO 2 max and its respective workload (IVO 2 max); b) three square-wave tests to exhaustion at 95-110% IVO 2 max to determine CP, and; (c) one square-wave test to exhaustion at 100%CP. During the exercise at CP the slow component expressed as absolute value (GT: 342.4165.8 ml.min -1 vs. GNT: 571.3170.1 ml.min -1 ) and as the relative contribution to the increase of VO 2 during exercise (GT: 10.04.6% vs. GNT: 26.67.3%) were lower for trained subjects. The VO 2 at the end of the exercise at PC (GT: 89.88.4%VO 2 max vs. GNT: 97.42.8%VO 2 max) was significantly lower in GT ( = 0.045), and similar to VO 2 max in GNT. Therefore, the aerobic level might influence the VO 2 responses to exercise at PC

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“…The heavy domain comprises all intensities between the lactate threshold and critical power, which corresponds to the highest constant intensity at which maximum oxygen uptake (VO 2 max) is not reached 3 . Intensities just above critical power (i.e., 5 to 10%) permit VO 2 max to be reached 4,5 , thereby entering the severe domain which is characterized by all exercise intensities at which VO 2 max is achieved. Finally, the extreme domain comprises even higher intensities when the individual reaches the point of exhaustion even before achieving VO 2 max 1,2,6 .…”

Section: Introductionmentioning

confidence: 99%

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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Time to exhaustion at and above critical power in trained cyclists: The relationship between heavy and severe intensity domains

Cited by 32 publications

References 34 publications

Agreement analysis between critical power and intensity corresponding to 50% in cycling exercise

Agreement analysis between critical power and intensity corresponding to 50% in cycling exercise

Cinética do VO2 durante o exercício realizado na potência crítica em ciclistas e indivíduos não-treinados no ciclismo

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

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