The effect of muscle length on motor unit discharge characteristics in human tibialis anterior muscle.

The effect of muscle length on motor unit discharge characteristics in human tibialis anterior muscle. Research Abstract Details 

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The effect of muscle length on motor unit discharge characteristics in human tibialis anterior muscle. Abstract Text:

D W Vander Linden,C G Kukulka,G L Soderberg,

Muscle length influences the contractile properties of muscle in that when muscle is lengthened the relaxation phase of the muscle twitch is prolonged and when muscle is shortened, the relaxation phase is shorter in duration. As a result, the force exerted by active motor units varies with muscle length during voluntary contractions. To determine if motoneuron spike trains were adjusted to accommodate for changes in the contractile properties imposed by shortened and lengthened muscle, motor unit action potentials were recorded from the tibialis anterior muscle at different muscle lengths. Twenty subjects performed isometric ramp contractions at ankle angles of 20 degrees dorsiflexion, neutral between dorsiflexion and plantar flexion, and 30 degrees plantar flexion, which put the tibialis anterior muscle in a shortened, neutral, or lengthened condition, respectively. During isometric contractions where torque increased at 5% MVC/s, motor unit discharge rate at recruitment was greater in shortened muscle than in lengthened muscle (P less than 0.05). Brief initial interspike intervals (less than 40 ms) occurred more frequently in shortened muscle than in either neutral length or lengthened muscle. During steady contractions, motor unit discharge rate was greater per unit torque (N.m) in shortened muscle than in neutral length or lengthened muscle (P less than 0.05). These findings indicate that muscle length does influence the discharge pattern of motor unit spike trains during isometric ramp contractions.(ABSTRACT TRUNCATED AT 250 WORDS)

The effect of muscle length on motor unit discharge characteristics in human tibialis anterior muscle. Publishing Authors By Initials

DW Vander Linden,CG Kukulka,GL Soderberg,

For similar biomechanics: stress, mechanical research abstracts see: biomechanics: stress, mechanical research

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The effect of muscle length on motor unit discharge characteristics in human tibialis anterior muscle. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: Experimental brain research. Experimentelle Hirnfo

VOLUME: 84

Page Numbers: 210-8

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ISSN: 0014-4819

DAY: 15

MONTH: 02

YEAR: 1991

The effect of muscle length on motor unit discharge characteristics in human tibialis anterior muscle. Information

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LANGUAGE: eng

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The effect of muscle length on motor unit discharge characteristics in human tibialis anterior muscle. Keywords Mesh Terms:

KEYWORDS: Stress, Mechanical

MESH TERMS: physiology

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Grant and Affiliation Information for The effect of muscle length on motor unit discharge characteristics in human tibialis anterior muscle.

AFFILIATION: Physical Therapy Department, University of Florida, Gainesville.

Country: GERMANY

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MEDLINETA: Exp Brain Res

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