Non-invasive estimation of muscle oxygen uptake kinetics with pseudorandom binary sequence and step exercise responses.
Eur J Appl Physiol
; 118(2): 429-438, 2018 Feb.
Article
em En
| MEDLINE
| ID: mdl-29250707
ABSTRACT
PURPOSE:
The aim of the study was to test for significant differences in non-invasively estimated muscle oxygen uptake ([Formula see text]) kinetics, assessed by a square-wave exercise protocol (STEP) as well as by a time series approach with pseudorandom binary sequence (PRBS) work rate (WR) changes.METHODS:
Seventeen healthy and active individuals (10 women, 7 men; 23 ± 2 years old; height 175 ± 11 cm; body mass 73 ± 14 kg [mean ± SD]) completed five repetitions of WR transitions from 30 to 80 W for the STEP approach and two sequences of pseudorandom binary WR changes between 30 and 80 W for the PRBS approach. Pulmonary oxygen uptake ([Formula see text]) was measured breath by breath. [Formula see text] kinetics were estimated during phase II [Formula see text] in the STEP approach and during the pseudorandom binary sequence WR changes in the PRBS approach.RESULTS:
No significant differences were observed between different models of the STEP and the PRBS approach for estimation of [Formula see text] kinetics (p > 0.05). In addition, a very high variability between the models was determined for [Formula see text] kinetics [mean time constants (τ) difference - 2.5 ± 11.4 s]. A significant correlation for τ of [Formula see text] between the STEP approach with experimentally determined phase I [Formula see text] lengths and the PRBS approach was noticed (r = 0.536; p < 0.05).CONCLUSIONS:
Both approaches (STEP and PRBS) are not significantly different for estimating the [Formula see text] kinetics, but the very high variability impairs the predictability between the models. However, the determination of the length of phase I [Formula see text] should be as appropriate as possible because predefined duration lengths can result in overestimations in [Formula see text] kinetics.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Consumo de Oxigênio
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Exercício Físico
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Músculo Esquelético
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Teste de Esforço
Tipo de estudo:
Prognostic_studies
Limite:
Adult
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Female
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Humans
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Male
Idioma:
En
Revista:
Eur J Appl Physiol
Assunto da revista:
FISIOLOGIA
Ano de publicação:
2018
Tipo de documento:
Article
País de afiliação:
Alemanha