Journal of Applied Physiology Virginia Commonwealth University
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J Appl Physiol 94: 193-198, 2003. First published September 20, 2002; doi:10.1152/japplphysiol.00600.2002
8750-7587/03 $5.00
This Article
Right arrow Full Text Free
Right arrow Full Text (PDF) Free
Right arrow All Versions of this Article:
94/1/193    most recent
00600.2002v1
Right arrow Submit a response
Right arrow Alert me when this article is cited
Right arrow Alert me when eLetters are posted
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via ISI Web of Science (20)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Millet, G. Y.
Right arrow Articles by Ballay, Y.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Millet, G. Y.
Right arrow Articles by Ballay, Y.
Vol. 94, Issue 1, 193-198, January 2003

Mechanisms contributing to knee extensor strength loss after prolonged running exercise

G. Y. Millet, V. Martin, G. Lattier, and Y. Ballay

INSERM/ERIT-M 0207 Motricité-Plasticité, Faculté des Sciences du Sport, Université de Bourgogne, 21078 Dijon Cedex, France

The aim of this study was to identify the mechanisms that contribute to the decline in knee extensor (KE) muscles strength after a prolonged running exercise. During the 2 days preceding a 30-km running race [duration 188.7 ± 27.0 (SD) min] and immediately after the race, maximal percutaneous electrical stimulations (single twitch, 0.5-s tetanus at 20 and 80 Hz) were applied to the femoral nerve of 12 trained runners. Superimposed twitches were also delivered during isometric maximal voluntary contraction (MVC) to determine the level of voluntary activation (%VA). The vastus lateralis electromyogram was recorded. KE MVC decreased from pre- to postexercise (from 188.1 ± 25.2 to 142.7 ± 29.7 N · m; P < 0.001) as did %VA (from 98.8 ± 1.8 to 91.3 ± 10.7%; P < 0.05). The changes from pre- to postexercise in these two variables were highly correlated (R = 0.88; P < 0.001). The modifications in the mechanical response after the 80-Hz stimulation and M-wave peak-to-peak amplitude were also significant (P < 0.001 and P < 0.05, respectively). It can be concluded that 1) central fatigue, neuromuscular propagation, and muscular factors are involved in the 23.5 ± 14.9% reduction in MVC after a prolonged running bout at racing pace and 2) runners with the greatest KE strength loss experience large activation deficit.

low- and high-frequency electrical stimulation; central activation; M wave; electromyogram


This article has been cited by other articles:


Home page
 Br. J. Sports. Med.Home page
T D Noakes
Testing for maximum oxygen consumption has produced a brainless model of human exercise performance
Br. J. Sports Med., July 1, 2008; 42(7): 551 - 555.
[Full Text] [PDF]

Home page
 Br. J. Sports. Med.Home page
A. Mendez-Villanueva, J. Fernandez-Fernandez, and D. Bishop
Exercise-induced homeostatic perturbations provoked by singles tennis match play with reference to development of fatigue
Br. J. Sports Med., November 1, 2007; 41(11): 717 - 722.
[Abstract] [Full Text] [PDF]

Home page
 J. Neurophysiol.Home page
S. Racinais, O. Girard, J. P. Micallef, and S. Perrey
Failed Excitability of Spinal Motoneurons Induced by Prolonged Running Exercise
J Neurophysiol, January 1, 2007; 97(1): 596 - 603.
[Abstract] [Full Text] [PDF]

Home page
 Br. J. Sports. Med.Home page
J P Weir, T W Beck, J T Cramer, T J Housh, T D Noakes, A St Clair Gibson, and E V Lambert
Is fatigue all in your head? A critical review of the central governor model * Commentary.
Br. J. Sports Med., July 1, 2006; 40(7): 573 - 586.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
V. Martin, G. Y. Millet, A. Martin, G. Deley, and G. Lattier
Assessment of low-frequency fatigue with two methods of electrical stimulation
J Appl Physiol, November 1, 2004; 97(5): 1923 - 1929.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Visit Other APS Journals Online