Int J Sports Med 2006; 27(6): 475-482
DOI: 10.1055/s-2005-865837
Training & Testing

© Georg Thieme Verlag KG Stuttgart · New York

Effects of Two Types of Fatigue on the V·O2 Slow Component

G. Deley1 , G. Y. Millet2 , F. Borrani3 , G. Lattier1 , L. Brondel4
  • 1INSERM/ERIT-M 0207 - Motricité et Plasticité, UFR STAPS, Dijon, France
  • 2Unité PPEH, Université Jean Monnet, Saint-Étienne, France
  • 3Institut des Sciences du Sport et de l'Education physique, Université de Lausanne, Lausanne, Switzerland
  • 4UMR - CNRS 5170 - Centre Européen des Sciences du Goût, Dijon, France
Further Information

Publication History

Accepted after revision: June 4, 2005

Publication Date:
30 August 2005 (online)

Abstract

The aim of the study was to test the hypothesis of the involvement of type II fibres in the V·O2 slow component phenomenon by using two prior fatiguing protocols on the knee extensor muscles. Nine subjects performed three constant-load cycling exercises at a work rate corresponding to 80 % of their V·O2 max: (i) preceded by a 20-min fatiguing protocol using electromyostimulation (EMS), (ii) preceded by a 20-min fatiguing protocol using voluntary contractions (VOL), and (iii) without fatiguing protocol (NFP). Voluntary and evoked neuromuscular properties of the knee extensor muscles were tested before (PRE) and after (POST) the two fatiguing protocols. Results show a significant reduction in voluntary force after both fatiguing protocols (- 19.9 % and - 11.8 %, in EMS and VOL, respectively p < 0.01). After EMS, this decrease was greater than after VOL (p < 0.05) and was combined with a slackening of muscle contractile properties which was absent after VOL (p < 0.05). Regarding the effects on oxygen uptake kinetics, the appearance of the slow component was delayed after EMS and its amplitude was lower than those obtained in VOL and NFP conditions (0.48 ± 0.07 vs. 0.75 ± 0.09 and 0.69 ± 0.08 L · min-1, respectively; p < 0.05). It can thus be concluded that exercises dedicated to preferentially fatiguing type II fibres may alter V·O2 kinetics.

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Gaëlle Deley

INSERM/ERIT-M 0207 - Motricité et plasticité
UFR STAPS · Campus Montmuzard

BP 27877

21078 Dijon Cedex

France

Phone: + 33380396762

Fax: + 33 3 80 39 67 02

Email: Gaelle.Deley@u-bourgogne.fr

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