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Relationship Between the Critical Power Test and a 20-min Functional Threshold Power Test in Cycling

To investigate the agreement between critical power (CP) and functional threshold power (FTP), 17 trained cyclists and triathletes (mean ± SD: age 31 ± 9 years, body mass 80 ± 10 kg, maximal aerobic power 350 ± 56 W, peak oxygen consumption 51 ± 10 mL⋅min(–1)⋅kg(–1)) performed a maximal incremental...

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Autores principales: Karsten, Bettina, Petrigna, Luca, Klose, Andreas, Bianco, Antonino, Townsend, Nathan, Triska, Christoph
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7862708/
https://www.ncbi.nlm.nih.gov/pubmed/33551839
http://dx.doi.org/10.3389/fphys.2020.613151
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author Karsten, Bettina
Petrigna, Luca
Klose, Andreas
Bianco, Antonino
Townsend, Nathan
Triska, Christoph
author_facet Karsten, Bettina
Petrigna, Luca
Klose, Andreas
Bianco, Antonino
Townsend, Nathan
Triska, Christoph
author_sort Karsten, Bettina
collection PubMed
description To investigate the agreement between critical power (CP) and functional threshold power (FTP), 17 trained cyclists and triathletes (mean ± SD: age 31 ± 9 years, body mass 80 ± 10 kg, maximal aerobic power 350 ± 56 W, peak oxygen consumption 51 ± 10 mL⋅min(–1)⋅kg(–1)) performed a maximal incremental ramp test, a single-visit CP test and a 20-min time trial (TT) test in randomized order on three different days. CP was determined using a time-trial (TT) protocol of three durations (12, 7, and 3 min) interspersed by 30 min passive rest. FTP was calculated as 95% of 20-min mean power achieved during the TT. Differences between means were examined using magnitude-based inferences and a paired-samples t-test. Effect sizes are reported as Cohen’s d. Agreement between CP and FTP was assessed using the 95% limits of agreement (LoA) method and Pearson correlation coefficient. There was a 91.7% probability that CP (256 ± 50 W) was higher than FTP (249 ± 44 W). Indeed, CP was significantly higher compared to FTP (P = 0.041) which was associated with a trivial effect size (d = 0.04). The mean bias between CP and FTP was 7 ± 13 W and LoA were −19 to 33 W. Even though strong correlations exist between CP and FTP (r = 0.969; P < 0.001), the chance of meaningful differences in terms of performance (1% smallest worthwhile change), were greater than 90%. With relatively large ranges for LoA between variables, these values generally should not be used interchangeably. Caution should consequently be exercised when choosing between FTP and CP for the purposes of performance analysis.
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spelling pubmed-78627082021-02-06 Relationship Between the Critical Power Test and a 20-min Functional Threshold Power Test in Cycling Karsten, Bettina Petrigna, Luca Klose, Andreas Bianco, Antonino Townsend, Nathan Triska, Christoph Front Physiol Physiology To investigate the agreement between critical power (CP) and functional threshold power (FTP), 17 trained cyclists and triathletes (mean ± SD: age 31 ± 9 years, body mass 80 ± 10 kg, maximal aerobic power 350 ± 56 W, peak oxygen consumption 51 ± 10 mL⋅min(–1)⋅kg(–1)) performed a maximal incremental ramp test, a single-visit CP test and a 20-min time trial (TT) test in randomized order on three different days. CP was determined using a time-trial (TT) protocol of three durations (12, 7, and 3 min) interspersed by 30 min passive rest. FTP was calculated as 95% of 20-min mean power achieved during the TT. Differences between means were examined using magnitude-based inferences and a paired-samples t-test. Effect sizes are reported as Cohen’s d. Agreement between CP and FTP was assessed using the 95% limits of agreement (LoA) method and Pearson correlation coefficient. There was a 91.7% probability that CP (256 ± 50 W) was higher than FTP (249 ± 44 W). Indeed, CP was significantly higher compared to FTP (P = 0.041) which was associated with a trivial effect size (d = 0.04). The mean bias between CP and FTP was 7 ± 13 W and LoA were −19 to 33 W. Even though strong correlations exist between CP and FTP (r = 0.969; P < 0.001), the chance of meaningful differences in terms of performance (1% smallest worthwhile change), were greater than 90%. With relatively large ranges for LoA between variables, these values generally should not be used interchangeably. Caution should consequently be exercised when choosing between FTP and CP for the purposes of performance analysis. Frontiers Media S.A. 2021-01-22 /pmc/articles/PMC7862708/ /pubmed/33551839 http://dx.doi.org/10.3389/fphys.2020.613151 Text en Copyright © 2021 Karsten, Petrigna, Klose, Bianco, Townsend and Triska. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Physiology
Karsten, Bettina
Petrigna, Luca
Klose, Andreas
Bianco, Antonino
Townsend, Nathan
Triska, Christoph
Relationship Between the Critical Power Test and a 20-min Functional Threshold Power Test in Cycling
title Relationship Between the Critical Power Test and a 20-min Functional Threshold Power Test in Cycling
title_full Relationship Between the Critical Power Test and a 20-min Functional Threshold Power Test in Cycling
title_fullStr Relationship Between the Critical Power Test and a 20-min Functional Threshold Power Test in Cycling
title_full_unstemmed Relationship Between the Critical Power Test and a 20-min Functional Threshold Power Test in Cycling
title_short Relationship Between the Critical Power Test and a 20-min Functional Threshold Power Test in Cycling
title_sort relationship between the critical power test and a 20-min functional threshold power test in cycling
topic Physiology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7862708/
https://www.ncbi.nlm.nih.gov/pubmed/33551839
http://dx.doi.org/10.3389/fphys.2020.613151
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