Physiological and metabolic responses of triathletes to a simulated 30-min time-trial in cycling at self-selected intensity

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Deutscher übersetzter Titel:Physiologische und metabolische Reaktionen bei Triathleten auf ein simuliertes 30-minütiges Zeitradfahren mit selbstgewählter Intensität
Autor:Perrey, S.; Grappe, F.; Girard, A.; Bringard, A.; Groslambert, A.; Bertucci, W.; Rouillon, J.D.
Erschienen in:International journal of sports medicine
Veröffentlicht:24 (2003), 2, S. 138-143, Lit.
Format: Literatur (SPOLIT)
Publikationstyp: Zeitschriftenartikel
Medienart: Gedruckte Ressource Elektronische Ressource (online)
Sprache:Englisch
ISSN:0172-4622, 1439-3964
DOI:10.1055/s-2003-38200
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Erfassungsnummer:PU200410002795
Quelle:BISp

Abstract des Autors

The aim of this study was to investigate the metabolic and physiological responses to a laboratory-based simulated 30-min individual time-trial (ITT30) in cycling at a self-selected intensity. Twelve experienced triathletes (n=4 women) performed a progressive incremental exercise test on a cycle ergometer to determine VO2max (52 ± 5 ml/min/kg), maximum power output (300 ± 12 W), and the second ventilatory threshold. Then, the subjects completed an ITT30 at self-selected work intensity on a stationary ergometer equipped with the SRM Training System. In all subjects, during the ITT30, heart rate and minute ventilation increased (p<0.05) progressively whereas oxygen consumption and power output remained unchanged. Triathletes rode at consistent pacing corresponding to their highest steady state of blood lactate concentration that increased by no more than 1.0 mmol/l during the final 20-min of ITT30. The self-selected intensity of triathletes during ITT30 represented 88 ± 5 % (mean ± SD) of VO2max and was not significantly different to the energy demand corresponding to the second ventilatory threshold (84 ± 5 % of VO2max). Our data suggest that ITT30 at a self-selected intensity is a good predictor of individual endurance capacity and may be used to estimate racing pace for training purposes. This performance test for the identification of the exercise intensity that demarcate "steady state" is less troublesome than some of the traditional methods, limiting testing to a single session. Verf.-Referat