Oxygen Uptake Plateau during Maximal Treadmill Exercise in Children

Rowland, Thomas W.; Cunningham, L. N.

doi:10.1378/chest.101.2.485

Cited by 100 publications

(59 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This success rate is over twice that reported commonly in the pediatric literature (36) and likely results, in part, from the very rapid VO 2 kinetics in this population that enables VO 2 max to be achieved within one min during "supramaximal" exercise ( Figure 1, upper right panel). With sufficiently motivated children, a second square-wave test performed in the residual 25% may increase this success rate further.…”

Section: Discussionmentioning

confidence: 51%

“…However, until rigorous protocols are developed to determine VO 2 max unambiguously in prepubertal children this issue remains undetermined. This situation give rise to speculation, for example, that children are less able to demonstrate a VO 2 plateau at VO 2 max because their inferior anaerobic capacity limits exercise tolerance (which is low compared with adults; 18) or that the VO 2 plateau may not indicate "the limits of cardiovascular function" in this population (36). In contrast, the present investigation demonstrates that, using a simple two-test protocol, a plateau of VO 2 against work rate can be achieved in 75% of instances across a broad range of aerobic capacities.…”

Section: Determinants Of Vo 2 Maxmentioning

confidence: 99%

See 1 more Smart Citation

Maximal Oxygen Uptake Validation in Children With Expiratory Flow Limitation

Robben

Poole²,

Harms³

2013

Pediatric Exercise Science

View full text Add to dashboard Cite

A two-test protocol (incremental/ramp (IWT) + supramaximal constant-load (CWR)) to affirm max and obviate reliance on secondary criteria has only been validated in highly fit children. In girls (n = 15) and boys (n = 12) with a wide range of VO 2 max (17-47 ml/kg/min), we hypothesized that this procedure would evince a VO 2 -WR plateau and unambiguous VO 2 max even in the presence of expiratory flow limitation (EFL). A plateau in the VO 2 -work rate relationship occurred in 75% of subjects irrespective of EFL There was a range in RER at max exercise for girls (0.97-1.14; mean 1.06 ± 0.04) and boys (0.98-1.09; mean 1.03 ± 0.03) such that 3/15 girls and 2/12 boys did not achieve the criterion RER. Moreover, in girls with RER > 1.0 it would have been possible to achieve this criterion at 78% VO 2 max. Boys achieved 92% VO 2 max at RER = 1.0. This was true also for HRmax where 8/15 girls' and 6/12 boys' VO 2 max would have been rejected based on HRmax being < 90% of age-predicted HRmax. In those who achieved the HRmax criterion, it represented a VO 2 of 86% (girls) and 87% (boys) VO 2 max. We conclude that this two-test protocol confirms VO 2 max in children across a threefold range of VO 2 max irrespective of EFL and circumvents reliance on secondary criteria.El protocolo que comprende dos test (incremental en rampa (TTI) + carga constante supramaximal) (CCS) aplicado para confirmar el consumo máximo de oxigeno y obviar la dependencia de los criterios secundarios ha sido solamente validado en niñas (n=15) y niños (n=12) bien entrenados, que poseían amplios rangos de VO 2 max (17-47 ml/kg/min). Nosotros hipnotizamos que este procedimiento podría evidenciar una meseta en la relación VO 2 -tasa de trabajo y por lo tanto indicar valores ambiguos de VO 2 max incluso en niños que presentan limitaciones del flujo espiratorio (LFE). La meseta en la relación entre el VO 2 -tasa de trabajo ocurre en el 75% de los sujetos, independientemente de que presenten LFE. El rango de valores en la relación de intercambio respiratorio (RER) se extendió entre 0.97 a 1.14 en niñas (M=1.06±0.04) y entre 0.98 a 1.09 en niños (M=1.03±0.03). De esta forma, 3/15 niñas y 2/12 niños no alcanzaron el criterio de RER para estimar el VO 2 max. Por otra parte, en las niñas que mostraron un RER>1.0 hubiera sido posible alcanzar este criterio con un valor del 78% VO 2 max. Los niños alcanzaron el 92% del VO 2 max con un RER=1.0. Esta respuesta, fue observada también

show abstract

Section: Discussionmentioning

confidence: 51%

Section: Determinants Of Vo 2 Maxmentioning

confidence: 99%

Maximal Oxygen Uptake Validation in Children With Expiratory Flow Limitation

Robben

Poole²,

Harms³

2013

Pediatric Exercise Science

View full text Add to dashboard Cite

show abstract

“…Alguns autores sugerem a utilização do valor de platô de VO 2 para considerar o valor de VO 2max , porém, recentes investigações têm observado a dificuldade de ocorrer esse fenômeno em crianças (23)(24) , sedentários (25) e indivíduos com doenças (26) . Alguns autores têm utilizado o valor médio dos três maiores valores seguidos como VO 2max de cada indivíduo (11) .…”

Section: Meninos Meninasunclassified

Comparação das variáveis cardiorrespiratórias de adolescentes obesos e não obesos em esteira e bicicleta ergométrica

Milano

Leite

2009

Rev Bras Med Esporte

View full text Add to dashboard Cite

RESUMoO objetivo deste estudo foi investigar o consumo máximo de oxigênio (VO 2max ) em adolescentes obesos e não obesos em esteira e bicicleta ergométrica. O estudo foi transversal e descritivo com a amostra de 54 indivíduos obesos (23 meninos e 31 meninas) e 33 não obesos (16 meninos e 17 meninas) com idade entre 10 e 16 anos. Utilizou-se o critério dos Centers for Disease Control and Prevention (CDC, 2000) para a classificação do índice de massa corporal (IMC). Foram avaliados o peso, estatura, índice de massa corporal (IMC) e IMC-escore Z. Para avaliação cardiorrespiratória foi realizado teste máximo em esteira e bicicleta ergométrica. Foram avaliados a frequência cardíaca máxima (FC max ), coeficiente respiratório (RER), consumo máximo de oxigênio (VO 2max ), tempo total de teste (TT) e carga final (w) na bicicleta ergométrica. Utilizou-se o teste de t de Student para a comparação dos ergômetros. Nas análises dos grupos, utilizou-se a ANOVA fatorial. Considerou-se significante p < 0,05. Os resultados revelaram que o peso, IMC e IMC-escore Z foram maiores nos obesos. Os valores de VO 2max absoluto (l.min -1 ) foram mais altos nos obesos, em ambos os gêneros, na esteira, sem diferenças entre os grupos na bicicleta. Entretanto, o VO 2max relativo ao peso corporal (ml.kg -1 .min -1 ) foi menor no grupo obeso e nas meninas, em ambos os ergômetros. A carga de trabalho na bicicleta foi similar entre os obesos e não obesos. Concluiu-se que os obesos apresentaram valores de VO 2max mais baixos que os não obesos em ambos os ergômetros. Entretanto, o fato de o indivíduo obeso na bicicleta suportar a mesma carga final que o não obeso sugere-se que a bicicleta pode ser indicado como o melhor ergômetro para obesos.Palavras-chave: obesidade, VO 2max , ergômetros. aBStRaCtThe aim of this study was to investigate the oxygen maximal uptake (VO 2max ) in obese and non-obese adolescents on treadmill and ergometric bicycle. The study was transversal and descriptive with a sample of 54 obese individuals (23 boys and 31 girls) and 33 non-obese individuals (16 boys and 17 girls), mean age of 10-16 years. The criterion by the Centers for Disease Control and Prevention (CDC, 2000) was used for classification of body mass index (BMI). Weight, height, body mass index (BMI) and BMI-score Z were assessed. A maximal test on treadmill and ergometric bicycle was performed for cardiorespiratory assessment. Maximum heart rate (HR max ), respiratory coefficient (REC), maximal oxygen uptake (VO 2max ), test total time (TT) and final load (w) on ergometric bicycle were assessed. Student' s t-test was used for ergometers comparison. Factorial ANOVA was used in the groups' analysis and p< 0.05 was considered significant. The results revealed that weight, BMI and BMI-score Z were higher in the obese subjects. The absolute VO 2max (m1 -1 ) values were higher in the obese subjects in both genders on treadmill, with no differences between the bicycle group. However, the VO 2max concerned with body weight (m1kg -1 min -1 ) was lower in the obese grou...

show abstract

“…The most highly contested of these criteria is the V O 2 plateau, first described by Hill and Lupton (1923). Since many subjects do not exhibit a plateau (Åstrand, 1952;Cumming & Borysyk, 1972;Cumming & Friesen, 1967;Cunningham et al, 1977;Freedson et al, 1986;Myers et al, 1989;Noakes, 1988;Rowland & Cunningham, 1992), it has been argued that meeting this criterion is not necessary for a true V O 2 max (Rowland & Cunningham, 1992). The use of a single number as a cut-off value has also been questioned .…”

Section: O 2 Max Criteriamentioning

confidence: 99%

Lungs And Legs: Entrainment Of Breathing To Locomotion In Highly Trained Distance Runners

Karp¹

2009

Medicine &Amp; Science in Sports &Amp; Exercise

View full text Add to dashboard Cite

Oxygen Uptake Plateau during Maximal Treadmill Exercise in Children

Cited by 100 publications

References 17 publications

Maximal Oxygen Uptake Validation in Children With Expiratory Flow Limitation

Maximal Oxygen Uptake Validation in Children With Expiratory Flow Limitation

Comparação das variáveis cardiorrespiratórias de adolescentes obesos e não obesos em esteira e bicicleta ergométrica

Lungs And Legs: Entrainment Of Breathing To Locomotion In Highly Trained Distance Runners

Contact Info

Product

Resources

About