Research article summary (published 30 Jul 2004):

Fatigue and recovery after high-intensity exercise part I: neuromuscular fatigue.

Full Abstract

The contribution of central and peripheral factors to muscle fatigue were quantified following a high-intensity uphill running exercise. Eight male volunteers performed an intermittent exercise at 120 % of maximal aerobic speed on a treadmill with an 18 % grade. Electrically evoked and voluntary contractions of the knee extensors and EMG of the two vastii were analyzed before and immediately after the high-intensity exercise. Isometric maximal voluntary contraction decreased slightly (-7+/-8 %; p < 0.05) after exercise but no changes were found in the level of maximal activation or in the torque produced by a 80 Hz maximal stimulation applied to the femoral nerve. Following exercise, the single twitch was characterized by lower peak torque, maximal rate of force development, and relaxation (-28+/-11%, -25+/-12%, -31+/-15% respectively, p < 0.001), and higher surface of the M-wave for both vastii. The ratio between the torques evoked by 20 Hz and 80 Hz stimulation declined significantly (-22+/-10%, p < 0.01) after exercise. These findings indicate that muscle fatigue after high-intensity running exercise is due to significant alteration in excitation-contraction coupling and that this type of exercise does not induce significant central fatigue or changes at the crossbridge level.

Author information

Author/s: Lattier, G (G); Millet, G Y (GY); Martin, A (A); Martin, V (V);

Affiliation: Faculty of Sport Sciences, University of Burgundy, Dijon, France. Gregory.Lattier(-atsign-)u-bourgogne.fr

Journal and publication information

Publication Type: Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't

Journal: International journal of sports medicine (Int J Sports Med), published in Germany. (Language: eng)

Reference: 2004-Aug; vol 25 (issue 6) : pp 450-6

Dates: Created 2004/09/03; Completed 2005/04/18; Revised 2006/11/15;

PMID: 15346234, status: MEDLINE (last retrieval date: 2/18/2009, IMS Date: )

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Adult Electric Stimulation Exercise - physiology Humans Hydrogen-Ion Concentration Male

Male Muscle Contraction - physiology Muscle Fatigue - physiology Muscle, Skeletal - physiopathology Nervous System - physiopathology Physical Endurance - physiology

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