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Time trials versus time to exhaustion tests: Effects on critical 1 power, W′ and oxygen uptake kinetics

Time trials versus time to exhaustion tests: Effects on critical 1 power, W′ and oxygen uptake kinetics

Karsten, Bettina, Baker, Jonathan, Naclerio, Fernando, Klose, Andreas, Bianco, Anthonino and Nimmerichter, Alfred (2017) Time trials versus time to exhaustion tests: Effects on critical 1 power, W′ and oxygen uptake kinetics. International Journal of Sports Physiology and Performance. pp. 1-22. ISSN 1555-0265 (Print), 1555-0273 (Online) (doi:10.1123/ijspp.2016-0761)

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Abstract

Purpose: To investigate single-day time-to-exhaustion (TTE) and time trial (TT) based laboratory tests values of critical power (CP), Wprime (W') and respective oxygen kinetics responses. Methods: Twelve cyclists performed a maximal ramp test followed by three TTE and three TT efforts interspersed by a 60-min recovery between efforts. Oxygen uptake was measured during all trials. The mean response time (MRT) was calculated as a description of the overall V ̇O2 kinetic response from the onset to 2 min of exercise. Results: TTE determined CP was 279 ± 52W and TT determined CP was 276 ± 50W (P = 0.237). Values of W were 14.3 ± 3.4 kJ (TTE W') and 16.5± 4.2 kJ (TT W') (P = 0.028). Whilst a high level of agreement (-12 to 17 W) and a low prediction error of 2.7% was established for CP, for W limits of agreements were markedly lower (-8 to 3.7 kJ) with a prediction error of 18.8%. The mean standard error for TTE CP values was significantly higher than that for TT CP values (2.4 ± 1.9% vs. 1.2 ± 0.7% W). The standard error for TTE W and TT W were 11.2 ± 8.1% and 5.6 ± 3.6%, respectively. The V ̇O2 response was significantly faster during TT (~22 s) than TTE (~28 s). Conclusions: The time-trial protocol with a 60-min recovery period offers a valid, time-saving and less error containing alternative to conventional and more recent testing methods. Results however cannot be transferred to W'.

Item Type: Article
Uncontrolled Keywords: V O2 response; Anaerobic work capacity; Power-duration relationship; Severe-intensity exercise
Subjects: G Geography. Anthropology. Recreation > GV Recreation Leisure
Q Science > QP Physiology
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Centre for Science and Medicine in Sport and Exercise
Faculty of Engineering & Science > Department of Life & Sports Sciences
Last Modified: 07 Nov 2017 12:43
Selected for GREAT 2016: None
Selected for GREAT 2017: GREAT a
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/17240

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