Int J Sports Med 2008; 29(3): 199-205
DOI: 10.1055/s-2007-965066
Training & Testing

© Georg Thieme Verlag KG Stuttgart · New York

Fatigue Responses in Exercise under Control of V·O2

P.-M. Lepretre1 , P. Lopes2 , J.-P. Koralsztein3 , V. Billat3
  • 1Laboratory of Biomechanics and Exercice Physiology, Department of Sports Sciences, Insitut National des Sports et de l'Education Physique, Paris, France
  • 2Department of Sports and Physical Activities, Univeristy of Evry - Val d'Essonne, Evry, France
  • 3Laboratory of Exercise Physiology, Department of Sports and Physical Activities of Evry, Evry, France
Further Information

Publication History

accepted after revision January 18, 2007

Publication Date:
18 September 2007 (online)

Abstract

To examine the fatigue response during an exhaustive heavy exercise performed under control of oxygen uptake (SS@V·O2Δ50) or power output (SS@pΔ50), eleven trained male subjects performed an incremental test to determine the peak of the oxygen uptake value (V·O2peak) and lactate threshold and two exhaustive steady-state cycling exercises at the intermediate value between the lactate threshold and V·O2peak (SS@V·O2Δ50 and SS@pΔ50). The control of V·O2 induced an oscillation of the power output, which lowered the average power output (276 ± 47 vs. 315 ± 40 W, p = 0.004) and cancelled the slow component of oxygen kinetics. However, all subjects reached maximal cardiac output (CO) and heart rate (HR) values which were sustained almost two times longer in SS@V·O2Δ50 compared to SS@pΔ50 (979 ± 854 vs. 475 ± 236 s, p = 0.046 for CO and 1050 ± 890 vs. 513 ± 288 s, p = 0.037 for HR). Furthermore, SS@pΔ50 elicited V·O2peak but not SS@V·O2Δ50 (4963 ± 434 vs. 4723 ± 460 mL · min-1, p = 0.026). Finally, the time spent at the maximal CO and HR values is correlated with time to exhaustion at V·O2Δ50. In conclusion, the cause of fatigue does not seem to have the same origin during exhaustive supra-lactate threshold exercise under control of V·O2 (V·O2Δ50) compared to constant power output (pΔ50), while both elicit the maximal HR and CO values.

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Dr. PhD Pierre-Marie Leprêtre

Laboratoire de Biomécanique et de Physiologie
Département des Sciences du Sport
Insitut National du Sport et de l'Education Physique

11, avenue du Tremblay

75015 Paris

France

Fax: + 33 141 74 45 35

Email: lepretre.pierre-marie@wanadoo.fr