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Verification-phase tests show low reliability and add little value in determining [Image: see text] O(2)max in young trained adults

OBJECTIVE: This study compared the robustness of a [Image: see text] -plateau definition and a verification-phase protocol to day-to-day and diurnal variations in determining the true [Image: see text] . Further, the additional value of a verification-phase was investigated. METHODS: Eighteen adults...

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Autores principales: Wagner, Jonathan, Niemeyer, Max, Infanger, Denis, Hinrichs, Timo, Guerra, Clement, Klenk, Christopher, Königstein, Karsten, Cajochen, Christian, Schmidt-Trucksäss, Arno, Knaier, Raphael
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7799856/
https://www.ncbi.nlm.nih.gov/pubmed/33428687
http://dx.doi.org/10.1371/journal.pone.0245306
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author Wagner, Jonathan
Niemeyer, Max
Infanger, Denis
Hinrichs, Timo
Guerra, Clement
Klenk, Christopher
Königstein, Karsten
Cajochen, Christian
Schmidt-Trucksäss, Arno
Knaier, Raphael
author_facet Wagner, Jonathan
Niemeyer, Max
Infanger, Denis
Hinrichs, Timo
Guerra, Clement
Klenk, Christopher
Königstein, Karsten
Cajochen, Christian
Schmidt-Trucksäss, Arno
Knaier, Raphael
author_sort Wagner, Jonathan
collection PubMed
description OBJECTIVE: This study compared the robustness of a [Image: see text] -plateau definition and a verification-phase protocol to day-to-day and diurnal variations in determining the true [Image: see text] . Further, the additional value of a verification-phase was investigated. METHODS: Eighteen adults performed six cardiorespiratory fitness tests at six different times of the day (diurnal variation) as well as a seventh test at the same time the sixth test took place (day-to-day variation). A verification-phase was performed immediately after each test, with a stepwise increase in intensity to 50%, 70%, and 105% of the peak power output. RESULTS: Participants mean [Image: see text] was 56 ± 8 mL/kg/min. Gwet’s AC(1) values (95% confidence intervals) for the day-to-day and diurnal variations were 0.64 (0.22, 1.00) and 0.71 (0.42, 0.99) for [Image: see text] -plateau and for the verification-phase 0.69 (0.31, 1.00) and 0.07 (−0.38, 0.52), respectively. In 66% of the tests, performing the verification-phase added no value, while, in 32% and 2%, it added uncertain value and certain value, respectively, in the determination of [Image: see text] . CONCLUSION: Compared to [Image: see text] -plateau the verification-phase shows lower reliability, increases costs and only adds certain value in 2% of cases.
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spelling pubmed-77998562021-01-22 Verification-phase tests show low reliability and add little value in determining [Image: see text] O(2)max in young trained adults Wagner, Jonathan Niemeyer, Max Infanger, Denis Hinrichs, Timo Guerra, Clement Klenk, Christopher Königstein, Karsten Cajochen, Christian Schmidt-Trucksäss, Arno Knaier, Raphael PLoS One Research Article OBJECTIVE: This study compared the robustness of a [Image: see text] -plateau definition and a verification-phase protocol to day-to-day and diurnal variations in determining the true [Image: see text] . Further, the additional value of a verification-phase was investigated. METHODS: Eighteen adults performed six cardiorespiratory fitness tests at six different times of the day (diurnal variation) as well as a seventh test at the same time the sixth test took place (day-to-day variation). A verification-phase was performed immediately after each test, with a stepwise increase in intensity to 50%, 70%, and 105% of the peak power output. RESULTS: Participants mean [Image: see text] was 56 ± 8 mL/kg/min. Gwet’s AC(1) values (95% confidence intervals) for the day-to-day and diurnal variations were 0.64 (0.22, 1.00) and 0.71 (0.42, 0.99) for [Image: see text] -plateau and for the verification-phase 0.69 (0.31, 1.00) and 0.07 (−0.38, 0.52), respectively. In 66% of the tests, performing the verification-phase added no value, while, in 32% and 2%, it added uncertain value and certain value, respectively, in the determination of [Image: see text] . CONCLUSION: Compared to [Image: see text] -plateau the verification-phase shows lower reliability, increases costs and only adds certain value in 2% of cases. Public Library of Science 2021-01-11 /pmc/articles/PMC7799856/ /pubmed/33428687 http://dx.doi.org/10.1371/journal.pone.0245306 Text en © 2021 Wagner et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Wagner, Jonathan
Niemeyer, Max
Infanger, Denis
Hinrichs, Timo
Guerra, Clement
Klenk, Christopher
Königstein, Karsten
Cajochen, Christian
Schmidt-Trucksäss, Arno
Knaier, Raphael
Verification-phase tests show low reliability and add little value in determining [Image: see text] O(2)max in young trained adults
title Verification-phase tests show low reliability and add little value in determining [Image: see text] O(2)max in young trained adults
title_full Verification-phase tests show low reliability and add little value in determining [Image: see text] O(2)max in young trained adults
title_fullStr Verification-phase tests show low reliability and add little value in determining [Image: see text] O(2)max in young trained adults
title_full_unstemmed Verification-phase tests show low reliability and add little value in determining [Image: see text] O(2)max in young trained adults
title_short Verification-phase tests show low reliability and add little value in determining [Image: see text] O(2)max in young trained adults
title_sort verification-phase tests show low reliability and add little value in determining [image: see text] o(2)max in young trained adults
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7799856/
https://www.ncbi.nlm.nih.gov/pubmed/33428687
http://dx.doi.org/10.1371/journal.pone.0245306
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