Métadonnées du dépôt
| Titre |
Neuromuscular fatigue following constant versus variable-intensity endurance cycling in triathletes
|
|
| Auteur |
Lepers, Romuald
|
|
| Auteur |
Theurel, Jean
|
|
| Auteur |
Hausswirth, Christophe
|
|
| Auteur |
Bernard, Thierry
|
|
| Affiliation |
R. Lepers, J. Theurel : University of Burgundy, Faculty of Sport Sciences, INSERM, U887, BP 27877, F-21078 Dijon cedex France. C. Hausswirth : Laboratory of Biomechanics and Physiology, French National Institute of Sport and Physical Education (INSEP), Avenue du Tremblay, 75012 Paris, France. T. Bernard : Department of Sport Ergonomic and Performance, UFR STAPS, University of Sud Toulon-Var, BP 132, 83957 La Garde Cedex, France.
|
|
| Sujet |
Triathlon -- Aspect physiologique
|
|
| Sujet |
Triathlon -- Physiological aspects
|
|
| Sujet |
Cyclisme -- Aspect physiologique
|
|
| Sujet |
Cycling -- Physiological aspects
|
|
| Résumé |
The aim of this study was to determine whether variable power cycling produced greater neuromuscular fatigue of knee extensor muscles than constant power cycling at the same mean power output. Eight male triathletes (age : 33 ± 5 yr, mass : 74 ± 4 kg, O2max : 62 ± 5 ml.kg-1.min-1, maximal aerobic power : 392 ± 17 W) performed two 30 min trials on a cycle ergometer in a random order. Cycling exercise was performed either at a constant power output (CP) corresponding to 75% of the maximal aerobic power (MAP) or a variable power output (VP) with alternating ± 15%, ± 5%, and ± 10% of 75% MAP approximately every 5 min. Maximal voluntary contraction (MVC) torque, maximal voluntary activation level, and excitation-contraction coupling process of knee extensor muscles were evaluated before and immediately after the exercise using the technique of electrically evoked contractions (single and paired stimulations). Oxygen uptake, ventilation, and heart rate were also measured at regular intervals during the exercise. Averaged metabolic variables were not significantly different between the two conditions. Similarly, reductions in MVC torque (~ -11%, P < 0.05) after cycling were not different (P > 0.05) between CP and VP trials. The magnitude of central and peripheral fatigue was also similar at the end of the two cycling exercises. It is concluded that following 30 min of endurance cycling, semi-elite triathletes experienced no additional neuromuscular fatigue by varying power (from ± 5 to 15%) compared with a protocol that involved a constant power. KEYWORDS : Maximal voluntary contraction, Central activation, Twitch, M-wave, Triathlon
|
|
| Éditeur de l'archive |
Institut National du Sport et de l'Education Physique, France
|
|
| Date (aaaa) |
2008
|
|
| Type |
Article revu par les pairs
|
|
| Format |
application/pdf
|
|
| Publié dans |
Journal of science and medicine in sport (issn : 1440-2440), 2008, vol. 11, n°4, pp. 381-389 (doi:10.1016/j.jsams.2007.03.001)
|
|
| URL de l'éditeur |
http://dx.doi.org/10.1016/j.jsams.2007.03.001
|
|
| Langue |
EN
|
|
| Droits |
Contrat Creative Commons : Paternité, pas d'utilisation commerciale, pas de modification
http://creativecommons.org/licenses/by-nc-nd/2.0/fr/
|
|
|
Nom de la communauté de recherche
|
Institut National du Sport et de l'Education Physique
|
|
|
Collection
|
Performance sportive
|
|
