Lactate, oxygen uptake, and cycling performance in triathletes

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Bibliographische Detailangaben
Deutscher übersetzter Titel:Laktat, Sauerstoffaufnahme und Radfahrleistung bei Triathleten
Autor:OToole, M.L.; Douglas, P.S.; Hiller, W.D.B.
Erschienen in:International journal of sports medicine
Veröffentlicht:10 (1989), 6, S. 413-418, Lit.
Format: Literatur (SPOLIT)
Publikationstyp: Zeitschriftenartikel
Medienart: Gedruckte Ressource Elektronische Ressource (online)
Sprache:Englisch
ISSN:0172-4622, 1439-3964
DOI:10.1055/s-2007-1024935
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Erfassungsnummer:PU199005043437
Quelle:BISp

Abstract

To assess the relationship of exercise test variables to each other and to bike race times in an ultra-distance triathlon, we studied 24 participants (14 men, 10 women) in the 1985 Hawaii Ironman Triathlon, using a graded, maximal cycle ergometer test. Exercise test variables were oxygen uptake (V02) and heart rate (HR) at the lactate and ventilatory thresholds. Lactate threshold (LT-1) was defined as the exercise intensity that elicited a 1 mM increase in blood lactate concentration. Variables were also examined at the lactate thresholds of 2 mM and 4 mM. Ventilatory thresholds (VT) were identified as the points at which the ventilatory equivalent of oxygen (VE/V02) increased without a corresponding increase in the ventilatory equivalent of carbon dioxide (VE/VCO2). Cycle peak V02 was inversely correlated with bike finish time. V02 and HR as well as the respective percentages of maximum were higher at all lactate thresholds than at VT. Therefore VT should not be used to identify a lactate threshold in utra-endurance triathletes. V02 values at the lactate and ventilatory thresholds were not highly related to bike finish time. Fractional utilization of peak V02 ( peak V02), HR, and peak HR at thresholds were not related to bike finish time. Cycle peak V02 and cycling economy (r = 0.61) were related to bike finish time in an ultra-distance triathlon, but physiologic variables at lactate or ventilatory thresholds were not useful to the athlete in predicting performance. Verf.-Referat