Research article summary:

Reflex inhibition during muscle fatigue in endurance-trained and sedentary individuals.

Abstract Extract:
Reflex inhibition of the motoneuron pool following fatiguing contractions may be mediated by the build-up of byproducts of fatigue. Endurance training is accompanied by neuromuscular adaptations that would alter the production and/or clearance of ... (Full abstract text below)

Published 2002Aug in Journal: Eur J Appl Physiol (Language : eng)

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1. Eur J Appl Physiol. 2002 Aug;87(4-5):462-8

Reflex inhibition during muscle fatigue in endurance-trained and sedentary individuals.

Walton DM, Kuchinad RA, Ivanova TD, Garland SJ

School of Physical Therapy, The University of Western Ontario, Elborn College, London, ON N6G 1H1, Canada.

Reflex inhibition of the motoneuron pool following fatiguing contractions may be mediated by the build-up of byproducts of fatigue. Endurance training is accompanied by neuromuscular adaptations that would alter the production and/or clearance of metabolic substrates. The purpose of the study was to determine the extent of reflex inhibition during and after fatigue in endurance-trained individuals compared to sedentary controls. Subjects produced isometric ankle plantarflexion contractions at 30% of maximal voluntary contraction (MVC) until their MVC torque declined by 30%. H-reflexes were measured during a brief rest period every 3 min as well as superimposed upon the contraction every minute. Both groups of subjects experienced a similar amount of reflex inhibition by the end of the fatiguing protocol, although the endurance time was twice as long for the endurance-trained subjects. The endurance-trained subjects showed a greater reduction in H-reflex amplitude early in the fatiguing protocol compared to the sedentary subjects. These experiments have demonstrated that the neuromuscular processes associated with fatigue-related reflex inhibition must be multi-faceted and cannot be explained solely by small-diameter afferents responding to the byproducts of muscle contraction.

PMID : 12172888 [PubMed - Indexed for MEDLINE]

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Full Author Information

First Name	LastName	Initials
David M	Walton	DM
Raul A	Kuchinad	RA
Tanya D	Ivanova	TD
S Jayne	Garland	SJ

Affiliation: School of Physical Therapy, The University of Western Ontario, Elborn College, London, ON N6G 1H1, Canada.

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