Physiological and Perceived Exertion Responses at Intermittent Critical Power and Intermittent Maximal Lactate Steady State

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Okuno, Nilo, Perandini, L, Simoes, H, Pereira, Gleber, Bishop, David ORCID: 0000-0002-6956-9188, Bethoin, S, Kokubun, E and Nakamura, Fabio (2011) Physiological and Perceived Exertion Responses at Intermittent Critical Power and Intermittent Maximal Lactate Steady State. Journal of Strength and Conditioning Research, 25 (7). pp. 2053-2058. ISSN 1064-8011 (print) 1533-4287 (online)


Okuno, NM, Perandini, LAB, Bishop, D, Simões, HG, Pereira, G, Berthoin, S, Kokubun, E, and Nakamura, FY. Physiological and perceived exertion responses at intermittent critical power and intermittent maximal lactate steady state. J Strength Cond Res 25(7): 2053-2058, 2011—The aim of this study was to compare the power outputs of the intermittent critical power (CPi) with the intermittent maximal lactate steady state (MLSSi) and to compare the physiological and perceptual responses exercising at CPi and MLSSi. Ten subjects performed intermittent trials on a cycle ergometer to determine CPi and MLSSi using 30:30 seconds of effort and pause. The oxygen uptake (V̇o2), heart rate (HR), blood lactate concentration ([Lac]), and rating of perceived exertion (RPE) responses were compared during 30-minute cycling at CPi and MLSSi. The CPi (267 ± 45 W) was similar to MLSSi (254 ± 39 W), and they were correlated (r = 0.88; p < 0.05). The V̇o2 and HR responses stabilized throughout exercising at CPi (2.52 ± 0.52 L·min−1; 156 ± 8 b·min−1) and MLSSi (2.41 ± 0.32 L·min−1; 152 ± 10 b·min−1). These physiological variables were similar between conditions. However, the [Lac] and RPE were higher from the middle to the end of exercise duration at CPi ([Lac] = 6.9 ± 2.6 mM; RPE = 17.1 ± 2.1 a.u.) compared to MLSSi ([Lac] = 5.1 ± 0.9 mM; RPE = 15.7 ± 1.8 a.u.). Therefore, CPi intensity determined from 30:30 seconds of effort and rest periods on a cycle ergometer is equivalent to the MLSSi, and there is a physiological steady state throughout both exercise intensities, although the [Lac] and RPE responses at CPi are higher than at MLSSi. Thus, the CPi and MLSSi may be used as tools for intermittent training evaluation and prescription.

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Item type Article
DOI 10.1519/JSC.0b013e3181e83a36
Official URL
Subjects Historical > Faculty/School/Research Centre/Department > Institute of Sport, Exercise and Active Living (ISEAL)
Historical > FOR Classification > 1106 Human Movement and Sports Science
Historical > SEO Classification > 970111 Expanding Knowledge in the Medical and Health Sciences
Keywords ResPubID23887, oxygen consumption, blood lactate concentration, heart rate, rating of perceived exertion
Citations in Scopus 10 - View on Scopus
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