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Time to exhaustion at maximal lactate steady state is similar for cycling and running in moderately trained subjects

Fontana, Piero ; Boutellier, Urs ; Knöpfli-Lenzin, Claudia

In: European Journal of Applied Physiology, 2009, vol. 107, no. 2, p. 187-192

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    Title
    • Time to exhaustion at maximal lactate steady state is similar for cycling and running in moderately trained subjects
    Author
    • Fontana, Piero. Exercise Physiology, Institute of Human Movement Sciences, ETH Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland
    • Boutellier, Urs. Exercise Physiology, Institute of Human Movement Sciences, ETH Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland
    • Knöpfli-Lenzin, Claudia. Exercise Physiology, Institute of Human Movement Sciences, ETH Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland
    Document Type
    • Postprint
    Language
    • English
    Published in
    • European Journal of Applied Physiology, 2009, vol. 107, no. 2, p. 187-192. Springer-Verlag
    Other Version
    OAI-PMH Identifier
    • oai:doc.rero.ch:317598
    Summary
    We compared time to exhaustion (t lim) at maximal lactate steady state (MLSS) between cycling and running, investigated if oxygen consumption, ventilation, blood lactate concentration, and perceived exertion differ between the exercise modes, and established whether MLSS can be determined for cycling and running using the same criteria. MLSS was determined in 15 moderately trained men (30±6years, 77±6kg) by several constant-load tests to exhaustion in cycling and running. Heart rate, oxygen consumption, and ventilation were recorded continuously. Blood lactate concentration and perceived exertion were measured every 5min. t lim (37.7±8.9 vs. 34.4±5.4min) and perceived exertion (7.2±1.7 vs. 7.2±1.5) were similar for cycling and running. Heart rate (165±8 vs. 175±10min−1; P<0.01), oxygen consumption (3.1±0.3 vs. 3.4±0.3lmin−1; P<0.001) and ventilation (93±12 vs. 103±16lmin−1; P<0.01) were lower for cycling compared to running, respectively, whereas blood lactate concentration (5.6±1.7 vs. 4.3±1.3mmoll−1; P<0.05) was higher for cycling. t lim at MLSS is similar for cycling and running, despite absolute differences in heart rate, ventilation, blood lactate concentration, and oxygen consumption. This may be explained by the relatively equal cardiorespiratory demand at MLSS. Additionally, the similar t lim for cycling and running allows the same criteria to be used for determining MLSS in both exercise modes