Determining Validity of Critical Power Estimated Using a Three-Minute All-Out Test in Hot Environments

Determining Validity of Critical Power Estimated Using a Three-Minute All-Out Test in Hot Environments

The aim of this study was to investigate the effects of heat on the validity of end-test power (EP) derived from a 3-min all-out test (3MT), which is considered as an alternative method for determining the conventional critical power. Twelve male cyclists were required to perform incremental exercis...

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Main Authors: Yu-Hsuan Kuo, Ching-Feng Cheng, Yu-Chi Kuo
Format: Article
Language:English
Published: MDPI AG 2021-08-01
Series:International Journal of Environmental Research and Public Health
Subjects:
critical threshold
exercise intensity
fitness test
heat
Online Access:https://www.mdpi.com/1660-4601/18/17/9193
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spelling doaj-c6825f8790d34e539ddf7208d36b1b0b2021-09-09T13:45:29ZengMDPI AGInternational Journal of Environmental Research and Public Health1661-78271660-46012021-08-01189193919310.3390/ijerph18179193Determining Validity of Critical Power Estimated Using a Three-Minute All-Out Test in Hot EnvironmentsYu-Hsuan Kuo0Ching-Feng Cheng1Yu-Chi Kuo2Department of Physical Education, Chinese Culture University, Taipei 11114, TaiwanDepartment of Athletic Performance, National Taiwan Normal University, Taipei 11677, TaiwanDepartment of Exercise and Health Science, National Taipei University of Nursing and Health Sciences, Taipei 11219, TaiwanThe aim of this study was to investigate the effects of heat on the validity of end-test power (EP) derived from a 3-min all-out test (3MT), which is considered as an alternative method for determining the conventional critical power. Twelve male cyclists were required to perform incremental exercise tests (IET) and 3MTs in both high temperature (HT; 35 °C) and thermoneutral temperature (NT; 22 °C) environments. Maximal oxygen uptake (VO<sub>2max</sub>), and first and second ventilatory thresholds (VT<sub>1</sub> and VT<sub>2</sub>, respectively) against the power output (<i>w</i>VO<sub>2max</sub>, <i>w</i>VT<sub>1</sub>, and <i>w</i>VT<sub>2</sub>) were measured during IETs. EP was recorded during the 3MTs. A significant correlation was observed between <i>w</i>VT<sub>2</sub> and EP under NT (<i>r</i> = 0.674, <i>p</i> < 0.05) and under HT (<i>r</i> = 0.672, <i>p</i> < 0.05). However, <i>w</i>VO<sub>2max</sub>, <i>w</i>VT<sub>1</sub>, <i>w</i>VT<sub>2</sub>, and EP were significantly higher in NT than in HT (<i>p</i> < 0.05). In conclusion, although the physiological stress induced by HT might impair exercise performance, the EP derived from 3MT can validly estimate <i>w</i>VT<sub>2</sub> under HT conditions.https://www.mdpi.com/1660-4601/18/17/9193critical thresholdexercise intensityfitness testheat
collection DOAJ
language English
format Article
sources DOAJ
author Yu-Hsuan Kuo
Ching-Feng Cheng
Yu-Chi Kuo
spellingShingle Yu-Hsuan Kuo
Ching-Feng Cheng
Yu-Chi Kuo
Determining Validity of Critical Power Estimated Using a Three-Minute All-Out Test in Hot Environments
International Journal of Environmental Research and Public Health
critical threshold
exercise intensity
fitness test
heat
author_facet Yu-Hsuan Kuo
Ching-Feng Cheng
Yu-Chi Kuo
author_sort Yu-Hsuan Kuo
title Determining Validity of Critical Power Estimated Using a Three-Minute All-Out Test in Hot Environments
title_short Determining Validity of Critical Power Estimated Using a Three-Minute All-Out Test in Hot Environments
title_full Determining Validity of Critical Power Estimated Using a Three-Minute All-Out Test in Hot Environments
title_fullStr Determining Validity of Critical Power Estimated Using a Three-Minute All-Out Test in Hot Environments
title_full_unstemmed Determining Validity of Critical Power Estimated Using a Three-Minute All-Out Test in Hot Environments
title_sort determining validity of critical power estimated using a three-minute all-out test in hot environments
publisher MDPI AG
series International Journal of Environmental Research and Public Health
issn 1661-7827
1660-4601
publishDate 2021-08-01
description The aim of this study was to investigate the effects of heat on the validity of end-test power (EP) derived from a 3-min all-out test (3MT), which is considered as an alternative method for determining the conventional critical power. Twelve male cyclists were required to perform incremental exercise tests (IET) and 3MTs in both high temperature (HT; 35 °C) and thermoneutral temperature (NT; 22 °C) environments. Maximal oxygen uptake (VO<sub>2max</sub>), and first and second ventilatory thresholds (VT<sub>1</sub> and VT<sub>2</sub>, respectively) against the power output (<i>w</i>VO<sub>2max</sub>, <i>w</i>VT<sub>1</sub>, and <i>w</i>VT<sub>2</sub>) were measured during IETs. EP was recorded during the 3MTs. A significant correlation was observed between <i>w</i>VT<sub>2</sub> and EP under NT (<i>r</i> = 0.674, <i>p</i> < 0.05) and under HT (<i>r</i> = 0.672, <i>p</i> < 0.05). However, <i>w</i>VO<sub>2max</sub>, <i>w</i>VT<sub>1</sub>, <i>w</i>VT<sub>2</sub>, and EP were significantly higher in NT than in HT (<i>p</i> < 0.05). In conclusion, although the physiological stress induced by HT might impair exercise performance, the EP derived from 3MT can validly estimate <i>w</i>VT<sub>2</sub> under HT conditions.
topic critical threshold
exercise intensity
fitness test
heat
url https://www.mdpi.com/1660-4601/18/17/9193
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