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| Research article summary (published 30 Dec 2001): |
Incidence of F waves in single human thenar motor units.
Full Abstract
F-wave generation, axon conduction velocities, and contractile properties were compared in 44 healthy individual human thenar motor units. Force and muscle action potentials were recorded when single motor axons were stimulated intraneurally about 10 cm proximal to the elbow. Each stimulus usually evoked only one electromyographic (EMG) potential. However, in seven units (16%), a single stimulus elicited an F wave in response to 1.7 +/- 1.6% (mean +/- SD) of the stimuli applied. Axon conduction velocity proximal to the site of stimulation was faster than distal conduction velocity (72.7 +/- 8.0 m/s versus 64.2 +/- 10.5 m/s). Distal conduction velocities, twitch forces, and contraction times were similar for units that did and did not generate F waves. Thus, no obvious subset of thenar motor units generated F waves. These results provide valuable baseline information on F waves that can be used to assess changes in axon conduction, motor unit contractile properties, and motoneuron excitability in disease.Copyright 2002 John Wiley & Sons, Inc.
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Author information
Author/s: Thomas, Christine K (CK); Johansson, Roland S (RS); Bigland-Ritchie, Brenda (B);
Affiliation: The Miami Project to Cure Paralysis, Department of Neurological Surgery, University of Miami School of Medicine, P.O. Box 016960 (R-48), Miami, FL 33101-9844, USA. cthomas(-atsign-)miamiproject.med.miami.edu
Grants: NS-14756 (Agency:United States NINDS) ; NS-30226 (Agency:United States NINDS)
Journal and publication information
Publication Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.
Journal: Muscle & nerve (Muscle Nerve), published in United States. (Language: eng)
Reference: 2002-Jan; vol 25 (issue 1) : pp 77-82
Dates: Created 2001/12/25; Completed 2002/01/29; Revised 2007/11/14;
PMID: 11754188, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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