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Reliability of the parameters of the power-duration relationship using maximal effort time-trials under laboratory conditions

Reliability of the parameters of the power-duration relationship using maximal effort time-trials under laboratory conditions

Triska, Christhoph, Karsten, Bettina, Heidegger, Bernd, Koller-Zeisler, Bernhard, Prinz, Bernhard, Nimmerichter, Alfred and Tschan, Harald (2017) Reliability of the parameters of the power-duration relationship using maximal effort time-trials under laboratory conditions. PLOS ONE, 12 (12):e0189776. ISSN 1932-6203 (Online) (doi:10.1371/journal.pone.0189776)

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Abstract

The purpose of this study was to assess the reliability of critical power (CP) and the total amount of work accomplished above CP (W´) across repeated tests using ecological valid maximal effort time-trials (TTs) under laboratory conditions. After an initial incremental exercise test, ten well-trained male triathletes (age: 28.5 ± 4.7 yrs; body mass: 73.3 ± 7.9 kg; height: 1.80 ± 0.07 m; maximal aerobic power (MAP): 328.6 ± 41.2 W) performed three testing sessions (Familiarization, Test I and Test II) each comprising three TTs (12 min, 7 min and 3 min with a passive recovery of 60 min between trials). CP and W´ were determined using a linear regression of power vs. the inverse of time (1/t) (P = W´ ∙ 1/t + CP). A repeated measure ANOVA was used to detect differences in CP and W´ and reliability was assessed using the intra-class correlation coefficient (ICC) and the coefficient of variation (CoV). CP and W´ values were not significantly different between repeated tests (P = 0.171 and P = 0.078 for CP and W´, respectively). The ICC between Familiarization and Test I was r = 0.86 (CP) and r = 0.58 (W´) and between Tests I and II it was r = 0.94 (CP) and r = 0.95 (W´). The CoV notably decreased from 4.1% to 2.6% and from 25.3% to 8.2% for CP and W´ respectively. Despite the non-significant differences for both parameter estimates between the repeated tests, ICC and CoV values improved notably after the Familiarization trial. Our novel findings indicate that for both, CP and W´ post familiarization ICC and CoV values indicated high reliability. It is therefore advisable to familiarize well-trained athletes when determining the power-duration relationship using TTs under laboratory conditions.

Item Type: Article
Additional Information: Copyright: © 2017 Triska et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Uncontrolled Keywords: Endurance, Fatigue, Performance testing, Exercise tolerance
Subjects: Q Science > QP Physiology
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Department of Life & Sports Sciences
Last Modified: 20 Dec 2017 11:13
URI: http://gala.gre.ac.uk/id/eprint/18247

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