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The effect of muscle fatigue on stimulus intensity requirements for central and peripheral fatigue quantification

Neyroud, Daria ; Vallotton, Alexia ; Millet, Guillaume ; Kayser, Bengt ; Place, Nicolas

In: European Journal of Applied Physiology, 2014, vol. 114, no. 1, p. 205-215

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    Titre
    • The effect of muscle fatigue on stimulus intensity requirements for central and peripheral fatigue quantification
    Auteur
    • Neyroud, Daria. Institute of Movement Sciences and Sports Medicine, University of Geneva, Geneva, Switzerland
    • Vallotton, Alexia. Institute of Sport Sciences and Department of Physiology, Faculty of Biology and Medicine, University of Lausanne, Quartier UNIL-Mouline, Building Geopolis, Lausanne, Switzerland
    • Millet, Guillaume. Université de Lyon, 42023, Saint-Étienne, France
    • Kayser, Bengt. Institute of Sport Sciences and Department of Physiology, Faculty of Biology and Medicine, University of Lausanne, Quartier UNIL-Mouline, Building Geopolis, Lausanne, Switzerland
    • Place, Nicolas. Institute of Sport Sciences and Department of Physiology, Faculty of Biology and Medicine, University of Lausanne, Quartier UNIL-Mouline, Building Geopolis, Lausanne, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • European Journal of Applied Physiology, 2014, vol. 114, no. 1, p. 205-215. Springer Berlin Heidelberg
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:325015
    Summary
    Purpose: The present study was designed to determine the stimulation intensity necessary for an adequate assessment of central and peripheral components of neuromuscular fatigue of the knee extensors. Methods: Three different stimulation intensities (100, 120 and 150% of the lowest intensity evoking a plateau in M-waves and twitch amplitudes, optimal stimulation intensity, OSI) were used to assess voluntary activation level (VAL) as well as M-wave, twitch and doublet amplitudes before, during and after an incremental isometric exercise performed by 14 (8 men) healthy and physically active volunteers. A visual analog scale was used to evaluate the associated discomfort. Results: There was no difference (p>0.05) in VAL between the three intensities before and after exercise. However, we found that stimulating at 100% OSI may overestimate the extent of peripheral fatigue during exercise, whereas 150% OSI stimulations led to greater discomfort associated with doublet stimulations as well as to an increased antagonist co-activation compared to 100% OSI. Conclusion: We recommend using 120% OSI, as it constitutes a good trade-off between discomfort and reliable measurements.