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Assessing contractile ability of the quadriceps muscle using ultrasound imaging

Delaney, Sinead, Worsley, Peter, Warner, Martin, Taylor, Mark and Stokes, Maria (2010) Assessing contractile ability of the quadriceps muscle using ultrasound imaging Muscle & Nerve, 42, (4), pp. 530-538. (doi:10.1002/mus.21725). (PMID:20665511).

Record type: Article


Muscle dimension changes on ultrasound imaging (USI)indicate contractile activity. Quadriceps force and rectus femoris (RF) dimensions were examined to assess USI for estimating contraction level. In 15 healthy males, mean age 24.8 years, isometric quadriceps force was measured in 90? knee flexion during submaximal and maximal voluntary contractions (MVCs) and at MVC in extension. Mid-thigh cross-sectional area (CSA), depth and width, and surface electromyography (EMG) of RF were recorded. Muscle width decreased curvilinearly as both force and EMG increased. At MVC, width was 3.2 6 0.5 cm, 25% smaller than at rest (4.4 6 0.7 cm), and similar to MVC in extension (?23%). CSA decreased linearly to ?18% at MVC. RF thickness increased by only 10% (at 30% to MVC). Similar width changes at MVC in flexion and extension indicate the clinical potential of USI for assessing quadriceps contractility. Sensitivity is limited to assessing strength to within 25% of MVC in young males.

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Published date: October 2010


Local EPrints ID: 169979
ISSN: 0148-639X
PURE UUID: 6ab427af-6691-4ac2-bc7b-67afed2cc5d2
ORCID for Peter Worsley: ORCID iD
ORCID for Martin Warner: ORCID iD
ORCID for Maria Stokes: ORCID iD

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Date deposited: 04 Jan 2011 11:26
Last modified: 18 Jul 2017 12:17

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Author: Sinead Delaney
Author: Peter Worsley ORCID iD
Author: Martin Warner ORCID iD
Author: Mark Taylor
Author: Maria Stokes ORCID iD

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